Subject: [PATCH 01/13] Partial implementation of SQL/JSON path language

From: Nikita Glukhov <[email-masked]>
Date: Fri, 1 Mar 2019 03:15:18 +0300

SQL 2016 standards among other things contains set of SQL/JSON features for
JSON processing inside of relational database.  The core of SQL/JSON is JSON
path language, allowing access parts of JSON documents and make computations
over them.  This commit implements partial support JSON path language as
separate datatype called "jsonpath".  The implementation is partial because
it's lacking datetime support and suppression of numeric errors.  Missing
features will be added later by separate commits.

Support of SQL/JSON features requires implementation of separate nodes, and it
will be considered in subsequent patches.  This commit includes following
set of plain functions, allowing to execute jsonpath over jsonb values:

 * jsonb_path_exists(jsonb, jsonpath[, jsonb, bool]),
 * jsonb_path_match(jsonb, jsonpath[, jsonb, bool]),
 * jsonb_path_query(jsonb, jsonpath[, jsonb, bool]),
 * jsonb_path_query_array(jsonb, jsonpath[, jsonb, bool]).
 * jsonb_path_query_first(jsonb, jsonpath[, jsonb, bool]).

This commit also implements "jsonb @? jsonpath" and "jsonb @@ jsonpath", which
are wrappers over jsonpath_exists(jsonb, jsonpath) and jsonpath_predicate(jsonb,
jsonpath) correspondingly.  These operators will have an index support
(implemented in subsequent patches).

Code was written by Nikita Glukhov and Teodor Sigaev, revised by me.
Documentation was written by Oleg Bartunov and Liudmila Mantrova.  The work
was inspired by Oleg Bartunov.

Discussion: https://postgr.es/m/fcc6fc6a-b497-f39a-923d-aa34d0c588e8%402ndQuadrant.com
Author: Nikita Glukhov, Teodor Sigaev, Alexander Korotkov, Oleg Bartunov, Liudmila Mantrova
Reviewed-by: Andrew Dunstan, Pavel Stehule, Tomas Vondra, Alexander Korotkov
---
 doc/src/sgml/biblio.sgml                     |   11 +
 doc/src/sgml/func.sgml                       |  729 ++++++++-
 doc/src/sgml/json.sgml                       |  237 ++-
 src/backend/Makefile                         |   11 +-
 src/backend/catalog/system_views.sql         |   40 +
 src/backend/utils/adt/.gitignore             |    3 +
 src/backend/utils/adt/Makefile               |   19 +-
 src/backend/utils/adt/jsonb.c                |   91 +-
 src/backend/utils/adt/jsonb_util.c           |    8 +
 src/backend/utils/adt/jsonpath.c             | 1051 ++++++++++++
 src/backend/utils/adt/jsonpath_exec.c        | 2273 ++++++++++++++++++++++++++
 src/backend/utils/adt/jsonpath_gram.y        |  480 ++++++
 src/backend/utils/adt/jsonpath_scan.l        |  638 ++++++++
 src/backend/utils/adt/regexp.c               |    4 +-
 src/backend/utils/errcodes.txt               |   15 +
 src/include/catalog/pg_operator.dat          |    8 +
 src/include/catalog/pg_proc.dat              |   39 +
 src/include/catalog/pg_type.dat              |    5 +
 src/include/regex/regex.h                    |    8 +
 src/include/utils/.gitignore                 |    1 +
 src/include/utils/jsonb.h                    |    4 +
 src/include/utils/jsonpath.h                 |  245 +++
 src/include/utils/jsonpath_scanner.h         |   32 +
 src/test/regress/expected/jsonb_jsonpath.out | 1564 ++++++++++++++++++
 src/test/regress/expected/jsonpath.out       |  806 +++++++++
 src/test/regress/parallel_schedule           |    7 +-
 src/test/regress/serial_schedule             |    2 +
 src/test/regress/sql/jsonb_jsonpath.sql      |  329 ++++
 src/test/regress/sql/jsonpath.sql            |  147 ++
 src/tools/msvc/Mkvcbuild.pm                  |    2 +
 src/tools/msvc/Solution.pm                   |   18 +
 src/tools/pgindent/typedefs.list             |   17 +
 32 files changed, 8789 insertions(+), 55 deletions(-)
 create mode 100644 src/backend/utils/adt/.gitignore
 create mode 100644 src/backend/utils/adt/jsonpath.c
 create mode 100644 src/backend/utils/adt/jsonpath_exec.c
 create mode 100644 src/backend/utils/adt/jsonpath_gram.y
 create mode 100644 src/backend/utils/adt/jsonpath_scan.l
 create mode 100644 src/include/utils/jsonpath.h
 create mode 100644 src/include/utils/jsonpath_scanner.h
 create mode 100644 src/test/regress/expected/jsonb_jsonpath.out
 create mode 100644 src/test/regress/expected/jsonpath.out
 create mode 100644 src/test/regress/sql/jsonb_jsonpath.sql
 create mode 100644 src/test/regress/sql/jsonpath.sql

diff --git a/doc/src/sgml/biblio.sgml b/doc/src/sgml/biblio.sgml
index 4953024..f06305d 100644
--- a/doc/src/sgml/biblio.sgml
+++ b/doc/src/sgml/biblio.sgml
@@ -136,6 +136,17 @@
     <pubdate>1988</pubdate>
    </biblioentry>
 
+   <biblioentry id="sqltr-19075-6">
+    <title>SQL Technical Report</title>
+    <subtitle>Part 6: SQL support for JavaScript Object
+      Notation (JSON)</subtitle>
+    <edition>First Edition.</edition>
+    <biblioid>
+    <ulink url="http://standards.iso.org/ittf/PubliclyAvailableStandards/c067367_ISO_IEC_TR_19075-6_2017.zip"></ulink>.
+    </biblioid>
+    <pubdate>2017.</pubdate>
+   </biblioentry>
+
   </bibliodiv>
 
   <bibliodiv>
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 86ff4e5..275fb3f 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -11289,26 +11289,563 @@ table2-mapping
  </sect1>
 
  <sect1 id="functions-json">
-  <title>JSON Functions and Operators</title>
+  <title>JSON Functions, Operators, and Expressions</title>
 
-  <indexterm zone="functions-json">
+  <para>
+   The functions, operators, and expressions described in this section
+   operate on JSON data:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     SQL/JSON path expressions
+     (see <xref linkend="functions-sqljson-path"/>).
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     PostgreSQL-specific functions and operators for JSON
+     data types (see <xref linkend="functions-pgjson"/>).
+    </para>
+   </listitem>
+  </itemizedlist>
+
+  <para>
+    To learn more about the SQL/JSON standard, see
+    <xref linkend="sqltr-19075-6"/>. For details on JSON types
+    supported in <productname>PostgreSQL</productname>,
+    see <xref linkend="datatype-json"/>.
+  </para>
+
+ <sect2 id="functions-sqljson-path">
+  <title>SQL/JSON Path Expressions</title>
+
+  <para>
+   SQL/JSON path expressions specify the items to be retrieved
+   from the JSON data, similar to XPath expressions used
+   for SQL access to XML. In <productname>PostgreSQL</productname>,
+   path expressions are implemented as the <type>jsonpath</type>
+   data type, described in <xref linkend="datatype-jsonpath"/>.
+  </para>
+
+  <para>JSON query functions and operators
+   pass the provided path expression to the <firstterm>path engine</firstterm>
+   for evaluation. If the expression matches the JSON data to be queried,
+   the corresponding SQL/JSON item is returned.
+   Path expressions are written in the SQL/JSON path language
+   and can also include arithmetic expressions and functions.
+   Query functions treat the provided expression as a
+   text string, so it must be enclosed in single quotes.
+  </para>
+
+  <para>
+   A path expression consists of a sequence of elements allowed
+   by the <type>jsonpath</type> data type.
+   The path expression is evaluated from left to right, but
+   you can use parentheses to change the order of operations.
+   If the evaluation is successful, an SQL/JSON sequence is produced,
+   and the evaluation result is returned to the JSON query function
+   that completes the specified computation.
+  </para>
+
+  <para>
+   To refer to the JSON data to be queried (the
+   <firstterm>context item</firstterm>), use the <literal>$</literal> sign
+   in the path expression. It can be followed by one or more
+   <link linkend="type-jsonpath-accessors">accessor operators</link>,
+   which go down the JSON structure level by level to retrieve the
+   content of context item. Each operator that follows deals with the
+   result of the previous evaluation step.
+  </para>
+
+  <para>
+   For example, suppose you have some JSON data from a GPS tracker that you
+   would like to parse, such as:
+<programlisting>
+{ "track" :
+  {
+    "segments" : [ 
+      { "location":   [ 47.763, 13.4034 ],
+        "start time": "2018-10-14 10:05:14",
+        "HR": 73
+      },
+      { "location":   [ 47.706, 13.2635 ],
+        "start time": "2018-10-14 10:39:21",
+        "HR": 130
+      } ]
+  }
+}
+</programlisting>
+  </para>
+
+  <para>
+   To retrieve the available track segments, you need to use the
+   <literal>.<replaceable>key</replaceable></literal> accessor
+   operator for all the preceding JSON objects:
+<programlisting>
+'$.track.segments'
+</programlisting>
+  </para>
+
+  <para>
+   If the item to retrieve is an element of an array, you have
+   to unnest this array using the [*] operator. For example,
+   the following path will return location coordinates for all
+   the available track segments:
+<programlisting>
+'$.track.segments[*].location'
+</programlisting>
+  </para>
+
+  <para>
+   To return the coordinates of the first segment only, you can
+   specify the corresponding subscript in the <literal>[]</literal>
+   accessor operator. Note that the SQL/JSON arrays are 0-relative:
+<programlisting>
+'$.track.segments[0].location'
+</programlisting>
+  </para>
+
+  <para>
+   The result of each path evaluation step can be processed
+   by one or more <type>jsonpath</type> operators and methods
+   listed in <xref linkend="functions-sqljson-path-operators"/>.
+   Each method must be preceded by a dot, while arithmetic and boolean
+   operators are separated from the operands by spaces. For example,
+   you can get an array size:
+<programlisting>
+'$.track.segments.size()'
+</programlisting>
+   For more examples of using <type>jsonpath</type> operators
+   and methods within path expressions, see
+   <xref linkend="functions-sqljson-path-operators"/>.
+  </para>
+
+  <para>
+   When defining the path, you can also use one or more
+   <firstterm>filter expressions</firstterm>, which work similar to
+   the <command>WHERE</command> clause in SQL. Each filter expression
+   can provide one or more filtering conditions that are applied
+   to the result of the path evaluation. Each filter expression must
+   be enclosed in parentheses and preceded by a question mark.
+   Filter expressions are applied from left to right and can be nested.
+   The <literal>@</literal> variable denotes the current path evaluation
+   result to be filtered, and can be followed by one or more accessor
+   operators to define the JSON element by which to filter the result.
+   Functions and operators that can be used in the filtering condition
+   are listed in <xref linkend="functions-sqljson-filter-ex-table"/>.
+   The result of the filter expression may be true, false, or unknown.
+  </para>
+
+  <para>
+   For example, the following path expression returns the heart
+   rate value only if it is higher than 130:
+<programlisting>
+'$.track.segments[*].HR ? (@ > 130)'
+</programlisting>
+  </para>
+
+  <para>
+   But suppose you would like to retrieve the start time of this segment
+   instead. In this case, you have to filter out irrelevant
+   segments before getting the start time, so the path in the
+   filter condition looks differently:
+<programlisting>
+'$.track.segments[*] ? (@.HR > 130)."start time"'
+</programlisting>
+  </para>
+
+  <para>
+   <productname>PostgreSQL</productname> also implements the following
+   extensions of the SQL/JSON standard:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     A path expression can be a boolean predicate. For example:
+<programlisting>
+'$.track.segments[*].HR &lt; 70'
+</programlisting>
+    </para>
+   </listitem>
+   <listitem>
+    <para>Writing the path as an expression is also valid:
+<programlisting>
+'$' || '.' || 'a'
+</programlisting>
+    </para>
+   </listitem>
+  </itemizedlist>
+
+   <sect3 id="strict-and-lax-modes">
+   <title>Strict and Lax Modes</title>
+    <para>
+     When you query JSON data, the path expression may not match the
+     actual JSON data structure. An attempt to access a non-existent
+     member of an object or element of an array results in a
+     structural error. SQL/JSON path expressions have two modes
+     of handling structural errors:
+    </para>
+
+   <itemizedlist>
+    <listitem>
+     <para>
+      lax (default) &mdash; the path engine implicitly adapts
+      the queried data to the specified path.
+      Any remaining structural errors are suppressed and converted
+      to empty SQL/JSON sequences.
+     </para>
+    </listitem>
+    <listitem>
+     <para>
+      strict &mdash; if a structural error occurs, an error is raised.
+     </para>
+    </listitem>
+   </itemizedlist>
+
+   <para>
+    The lax mode facilitates matching of a JSON document structure and path
+    expression if the JSON data does not conform to the expected schema.
+    If an operand does not match the requirements of a particular operation,
+    it can be automatically wrapped as an SQL/JSON array or unwrapped by
+    converting its elements into an SQL/JSON sequence before performing
+    this operation. Besides, comparison operators automatically unwrap their
+    operands in the lax mode, so you can compare SQL/JSON arrays
+    out-of-the-box. Arrays of size 1 are interchangeable with a singleton.
+   </para>
+
+   <para>
+    For example, when querying the GPS data listed above, you can
+    abstract from the fact that it stores an array of segments
+    when using the lax mode:
+<programlisting>
+'lax $.track.segments.location'
+</programlisting>
+   </para>
+
+   <para>
+    In the strict mode, the specified path must exactly match the structure of
+    the queried JSON document to return an SQL/JSON item, so using this
+    path expression will cause an error. To get the same result as in
+    the lax mode, you have to explicitly unwrap the
+    <literal>segments</literal> array:
+<programlisting>
+'strict $.track.segments[*].location'
+</programlisting>
+   </para>
+
+   <para>
+    Implicit unwrapping in the lax mode is not performed in the following cases:
+    <itemizedlist>
+     <listitem>
+      <para>
+       The path expression contains <literal>type()</literal> or
+       <literal>size()</literal> methods that return the type
+       and the number of elements in the array, respectively.
+      </para>
+     </listitem>
+     <listitem>
+      <para>
+       The queried JSON data contain nested arrays. In this case, only
+       the outermost array is unwrapped, while all the inner arrays
+       remain unchanged. Thus, implicit unwrapping can only go one
+       level down within each path evaluation step.
+      </para>
+     </listitem>
+    </itemizedlist>
+   </para>
+
+   </sect3>
+
+   <sect3 id="functions-sqljson-path-operators">
+   <title>SQL/JSON Path Operators and Methods</title>
+
+   <table id="functions-sqljson-op-table">
+    <title><type>jsonpath</type> Operators and Methods</title>
+     <tgroup cols="5">
+      <thead>
+       <row>
+        <entry>Operator/Method</entry>
+        <entry>Description</entry>
+        <entry>Example JSON</entry>
+        <entry>Example Query</entry>
+        <entry>Result</entry>
+       </row>
+      </thead>
+      <tbody>
+       <row>
+        <entry><literal>+</literal> (unary)</entry>
+        <entry>Plus operator that iterates over the json sequence</entry>
+        <entry><literal>{"x": [2.85, -14.7, -9.4]}</literal></entry>
+        <entry><literal>+ $.x.floor()</literal></entry>
+        <entry><literal>2, -15, -10</literal></entry>
+       </row>
+       <row>
+        <entry><literal>-</literal> (unary)</entry>
+        <entry>Minus operator that iterates over the json sequence</entry>
+        <entry><literal>{"x": [2.85, -14.7, -9.4]}</literal></entry>
+        <entry><literal>- $.x.floor()</literal></entry>
+        <entry><literal>-2, 15, 10</literal></entry>
+       </row>
+       <row>
+        <entry><literal>+</literal> (binary)</entry>
+        <entry>Addition</entry>
+        <entry><literal>[2]</literal></entry>
+        <entry><literal>2 + $[0]</literal></entry>
+        <entry><literal>4</literal></entry>
+       </row>
+       <row>
+        <entry><literal>-</literal> (binary)</entry>
+        <entry>Subtraction</entry>
+        <entry><literal>[2]</literal></entry>
+        <entry><literal>4 - $[0]</literal></entry>
+        <entry><literal>2</literal></entry>
+       </row>
+       <row>
+        <entry><literal>*</literal></entry>
+        <entry>Multiplication</entry>
+        <entry><literal>[4]</literal></entry>
+        <entry><literal>2 * $[0]</literal></entry>
+        <entry><literal>8</literal></entry>
+       </row>
+       <row>
+        <entry><literal>/</literal></entry>
+        <entry>Division</entry>
+        <entry><literal>[8]</literal></entry>
+        <entry><literal>$[0] / 2</literal></entry>
+        <entry><literal>4</literal></entry>
+       </row>
+       <row>
+        <entry><literal>%</literal></entry>
+        <entry>Modulus</entry>
+        <entry><literal>[32]</literal></entry>
+        <entry><literal>$[0] % 10</literal></entry>
+        <entry><literal>2</literal></entry>
+       </row>
+       <row>
+        <entry><literal>type()</literal></entry>
+        <entry>Type of the SQL/JSON item</entry>
+        <entry><literal>[1, "2", {}]</literal></entry>
+        <entry><literal>$[*].type()</literal></entry>
+        <entry><literal>"number", "string", "object"</literal></entry>
+       </row>
+       <row>
+        <entry><literal>size()</literal></entry>
+        <entry>Size of the SQL/JSON item</entry>
+        <entry><literal>{"m": [11, 15]}</literal></entry>
+        <entry><literal>$.m.size()</literal></entry>
+        <entry><literal>2</literal></entry>
+       </row>
+       <row>
+        <entry><literal>double()</literal></entry>
+        <entry>Approximate numeric value converted from a string</entry>
+        <entry><literal>{"len": "1.9"}</literal></entry>
+        <entry><literal>$.len.double() * 2</literal></entry>
+        <entry><literal>3.8</literal></entry>
+       </row>
+       <row>
+        <entry><literal>ceiling()</literal></entry>
+        <entry>Nearest integer greater than or equal to the SQL/JSON number</entry>
+        <entry><literal>{"h": 1.3}</literal></entry>
+        <entry><literal>$.h.ceiling()</literal></entry>
+        <entry><literal>2</literal></entry>
+       </row>
+       <row>
+        <entry><literal>floor()</literal></entry>
+        <entry>Nearest integer less than or equal to the SQL/JSON number</entry>
+        <entry><literal>{"h": 1.3}</literal></entry>
+        <entry><literal>$.h.floor()</literal></entry>
+        <entry><literal>1</literal></entry>
+       </row>
+       <row>
+        <entry><literal>abs()</literal></entry>
+        <entry>Absolute value of the SQL/JSON number</entry>
+        <entry><literal>{"z": -0.3}</literal></entry>
+        <entry><literal>$.z.abs()</literal></entry>
+        <entry><literal>0.3</literal></entry>
+       </row>
+       <row>
+        <entry><literal>keyvalue()</literal></entry>
+        <entry>
+          Sequence of object's key-value pairs represented as array of objects
+          containing three fields (<literal>"key"</literal>,
+          <literal>"value"</literal>, and <literal>"id"</literal>).
+          <literal>"id"</literal> is an unique identifier of the object
+          key-value pair belongs to.
+        </entry>
+        <entry><literal>{"x": "20", "y": 32}</literal></entry>
+        <entry><literal>$.keyvalue()</literal></entry>
+        <entry><literal>{"key": "x", "value": "20", "id": 0}, {"key": "y", "value": 32, "id": 0}</literal></entry>
+       </row>
+      </tbody>
+     </tgroup>
+    </table>
+
+    <table id="functions-sqljson-filter-ex-table">
+     <title><type>jsonpath</type> Filter Expression Elements</title>
+     <tgroup cols="5">
+      <thead>
+       <row>
+        <entry>Value/Predicate</entry>
+        <entry>Description</entry>
+        <entry>Example JSON</entry>
+        <entry>Example Query</entry>
+        <entry>Result</entry>
+       </row>
+      </thead>
+      <tbody>
+       <row>
+        <entry><literal>==</literal></entry>
+        <entry>Equality operator</entry>
+        <entry><literal>[1, 2, 1, 3]</literal></entry>
+        <entry><literal>$[*] ? (@ == 1)</literal></entry>
+        <entry><literal>1, 1</literal></entry>
+       </row>
+       <row>
+        <entry><literal>!=</literal></entry>
+        <entry>Non-equality operator</entry>
+        <entry><literal>[1, 2, 1, 3]</literal></entry>
+        <entry><literal>$[*] ? (@ != 1)</literal></entry>
+        <entry><literal>2, 3</literal></entry>
+       </row>
+       <row>
+        <entry><literal>&lt;&gt;</literal></entry>
+        <entry>Non-equality operator (same as <literal>!=</literal>)</entry>
+        <entry><literal>[1, 2, 1, 3]</literal></entry>
+        <entry><literal>$[*] ? (@ &lt;&gt; 1)</literal></entry>
+        <entry><literal>2, 3</literal></entry>
+       </row>
+       <row>
+        <entry><literal>&lt;</literal></entry>
+        <entry>Less-than operator</entry>
+        <entry><literal>[1, 2, 3]</literal></entry>
+        <entry><literal>$[*] ? (@ &lt; 2)</literal></entry>
+        <entry><literal>1, 2</literal></entry>
+       </row>
+       <row>
+        <entry><literal>&lt;=</literal></entry>
+        <entry>Less-than-or-equal-to operator</entry>
+        <entry><literal>[1, 2, 3]</literal></entry>
+        <entry><literal>$[*] ? (@ &lt; 2)</literal></entry>
+        <entry><literal>1</literal></entry>
+       </row>
+       <row>
+        <entry><literal>&gt;</literal></entry>
+        <entry>Greater-than operator</entry>
+        <entry><literal>[1, 2, 3]</literal></entry>
+        <entry><literal>$[*] ? (@ &gt; 2)</literal></entry>
+        <entry><literal>3</literal></entry>
+       </row>
+       <row>
+        <entry><literal>&gt;</literal></entry>
+        <entry>Greater-than-or-equal-to operator</entry>
+        <entry><literal>[1, 2, 3]</literal></entry>
+        <entry><literal>$[*] ? (@ &gt;= 2)</literal></entry>
+        <entry><literal>2, 3</literal></entry>
+       </row>
+       <row>
+        <entry><literal>true</literal></entry>
+        <entry>Value used to perform comparison with JSON <literal>true</literal> literal</entry>
+        <entry><literal>[{"name": "John", "parent": false},
+                           {"name": "Chris", "parent": true}]</literal></entry>
+        <entry><literal>$[*] ? (@.parent == true)</literal></entry>
+        <entry><literal>{"name": "Chris", "parent": true}</literal></entry>
+       </row>
+       <row>
+        <entry><literal>false</literal></entry>
+        <entry>Value used to perform comparison with JSON <literal>false</literal> literal</entry>
+        <entry><literal>[{"name": "John", "parent": false},
+                           {"name": "Chris", "parent": true}]</literal></entry>
+        <entry><literal>$[*] ? (@.parent == false)</literal></entry>
+        <entry><literal>{"name": "John", "parent": false}</literal></entry>
+       </row>
+       <row>
+        <entry><literal>null</literal></entry>
+        <entry>Value used to perform comparison with JSON <literal>null</literal> value</entry>
+        <entry><literal>[{"name": "Mary", "job": null},
+                         {"name": "Michael", "job": "driver"}]</literal></entry>
+        <entry><literal>$[*] ? (@.job == null) .name</literal></entry>
+        <entry><literal>"Mary"</literal></entry>
+       </row>
+       <row>
+        <entry><literal>&amp;&amp;</literal></entry>
+        <entry>Boolean AND</entry>
+        <entry><literal>[1, 3, 7]</literal></entry>
+        <entry><literal>$[*] ? (@ &gt; 1 &amp;&amp; @ &lt; 5)</literal></entry>
+        <entry><literal>3</literal></entry>
+       </row>
+       <row>
+        <entry><literal>||</literal></entry>
+        <entry>Boolean OR</entry>
+        <entry><literal>[1, 3, 7]</literal></entry>
+        <entry><literal>$[*] ? (@ &lt; 1 || @ &gt; 5)</literal></entry>
+        <entry><literal>7</literal></entry>
+       </row>
+       <row>
+        <entry><literal>!</literal></entry>
+        <entry>Boolean NOT</entry>
+        <entry><literal>[1, 3, 7]</literal></entry>
+        <entry><literal>$[*] ? (!(@ &lt; 5))</literal></entry>
+        <entry><literal>7</literal></entry>
+       </row>
+       <row>
+        <entry><literal>like_regex</literal></entry>
+        <entry>Tests pattern matching with POSIX regular expressions</entry>
+        <entry><literal>["abc", "abd", "aBdC", "abdacb", "babc"]</literal></entry>
+        <entry><literal>$[*] ? (@ like_regex "^ab.*c" flag "i")</literal></entry>
+        <entry><literal>"abc", "aBdC", "abdacb"</literal></entry>
+       </row>
+       <row>
+        <entry><literal>starts with</literal></entry>
+        <entry>Tests whether the second operand is an initial substring of the first operand</entry>
+        <entry><literal>["John Smith", "Mary Stone", "Bob Johnson"]</literal></entry>
+        <entry><literal>$[*] ? (@ starts with "John")</literal></entry>
+        <entry><literal>"John Smith"</literal></entry>
+       </row>
+       <row>
+        <entry><literal>exists</literal></entry>
+        <entry>Tests whether a path expression has at least one SQL/JSON item</entry>
+        <entry><literal>{"x": [1, 2], "y": [2, 4]}</literal></entry>
+        <entry><literal>strict $.* ? (exists (@ ? (@[*] > 2)))</literal></entry>
+        <entry><literal>2, 4</literal></entry>
+       </row>
+       <row>
+        <entry><literal>is unknown</literal></entry>
+        <entry>Tests whether a boolean condition is <literal>unknown</literal></entry>
+        <entry><literal>[-1, 2, 7, "infinity"]</literal></entry>
+        <entry><literal>$[*] ? ((@ > 0) is unknown)</literal></entry>
+        <entry><literal>"infinity"</literal></entry>
+       </row>
+      </tbody>
+     </tgroup>
+    </table>
+   </sect3>
+
+  </sect2>
+
+  <sect2 id="functions-pgjson">
+  <title>PostgreSQL-specific JSON Functions and Operators</title>
+  <indexterm zone="functions-pgjson">
     <primary>JSON</primary>
     <secondary>functions and operators</secondary>
   </indexterm>
 
-   <para>
+  <para>
    <xref linkend="functions-json-op-table"/> shows the operators that
-   are available for use with the two JSON data types (see <xref
+   are available for use with JSON data types (see <xref
    linkend="datatype-json"/>).
   </para>
 
   <table id="functions-json-op-table">
      <title><type>json</type> and <type>jsonb</type> Operators</title>
-     <tgroup cols="5">
+     <tgroup cols="6">
       <thead>
        <row>
         <entry>Operator</entry>
         <entry>Right Operand Type</entry>
+        <entry>Return type</entry>
         <entry>Description</entry>
         <entry>Example</entry>
         <entry>Example Result</entry>
@@ -11318,6 +11855,7 @@ table2-mapping
        <row>
         <entry><literal>-&gt;</literal></entry>
         <entry><type>int</type></entry>
+        <entry><type>json</type> or <type>jsonb</type></entry>
         <entry>Get JSON array element (indexed from zero, negative
         integers count from the end)</entry>
         <entry><literal>'[{"a":"foo"},{"b":"bar"},{"c":"baz"}]'::json-&gt;2</literal></entry>
@@ -11326,6 +11864,7 @@ table2-mapping
        <row>
         <entry><literal>-&gt;</literal></entry>
         <entry><type>text</type></entry>
+        <entry><type>json</type> or <type>jsonb</type></entry>
         <entry>Get JSON object field by key</entry>
         <entry><literal>'{"a": {"b":"foo"}}'::json-&gt;'a'</literal></entry>
         <entry><literal>{"b":"foo"}</literal></entry>
@@ -11333,6 +11872,7 @@ table2-mapping
         <row>
         <entry><literal>-&gt;&gt;</literal></entry>
         <entry><type>int</type></entry>
+        <entry><type>text</type></entry>
         <entry>Get JSON array element as <type>text</type></entry>
         <entry><literal>'[1,2,3]'::json-&gt;&gt;2</literal></entry>
         <entry><literal>3</literal></entry>
@@ -11340,6 +11880,7 @@ table2-mapping
        <row>
         <entry><literal>-&gt;&gt;</literal></entry>
         <entry><type>text</type></entry>
+        <entry><type>text</type></entry>
         <entry>Get JSON object field as <type>text</type></entry>
         <entry><literal>'{"a":1,"b":2}'::json-&gt;&gt;'b'</literal></entry>
         <entry><literal>2</literal></entry>
@@ -11347,14 +11888,16 @@ table2-mapping
        <row>
         <entry><literal>#&gt;</literal></entry>
         <entry><type>text[]</type></entry>
-        <entry>Get JSON object at specified path</entry>
+        <entry><type>json</type> or <type>jsonb</type></entry>
+        <entry>Get JSON object at the specified path</entry>
         <entry><literal>'{"a": {"b":{"c": "foo"}}}'::json#&gt;'{a,b}'</literal></entry>
         <entry><literal>{"c": "foo"}</literal></entry>
        </row>
        <row>
         <entry><literal>#&gt;&gt;</literal></entry>
         <entry><type>text[]</type></entry>
-        <entry>Get JSON object at specified path as <type>text</type></entry>
+        <entry><type>text</type></entry>
+        <entry>Get JSON object at the specified path as <type>text</type></entry>
         <entry><literal>'{"a":[1,2,3],"b":[4,5,6]}'::json#&gt;&gt;'{a,2}'</literal></entry>
         <entry><literal>3</literal></entry>
        </row>
@@ -11479,6 +12022,21 @@ table2-mapping
         JSON arrays, negative integers count from the end)</entry>
         <entry><literal>'["a", {"b":1}]'::jsonb #- '{1,b}'</literal></entry>
        </row>
+       <row>
+        <entry><literal>@?</literal></entry>
+        <entry><type>jsonpath</type></entry>
+        <entry>Does JSON path returns any item for the specified JSON value?</entry>
+        <entry><literal>'{"a":[1,2,3,4,5]}'::jsonb @? '$.a[*] ? (@ > 2)'</literal></entry>
+       </row>
+       <row>
+        <entry><literal>@@</literal></entry>
+        <entry><type>jsonpath</type></entry>
+        <entry>JSON path predicate check result for the specified JSON value.
+        Only first result item is taken into account.  If there is no results
+        or first result item is not bool, then <literal>NULL</literal>
+        is returned.</entry>
+        <entry><literal>'{"a":[1,2,3,4,5]}'::jsonb @@ '$.a[*] > 2'</literal></entry>
+       </row>
       </tbody>
      </tgroup>
    </table>
@@ -11492,6 +12050,16 @@ table2-mapping
    </para>
   </note>
 
+  <note>
+   <para>
+    The <literal>@?</literal> and <literal>@@</literal> operators suppress
+    errors including: lacking object field or array element, unexpected JSON
+    item type.
+    This behavior might be helpful while searching over JSON document
+    collections of varying structure.
+   </para>
+  </note>
+
   <para>
    <xref linkend="functions-json-creation-table"/> shows the functions that are
    available for creating <type>json</type> and <type>jsonb</type> values.
@@ -11752,6 +12320,21 @@ table2-mapping
   <indexterm>
    <primary>jsonb_pretty</primary>
   </indexterm>
+  <indexterm>
+   <primary>jsonb_path_exists</primary>
+  </indexterm>
+  <indexterm>
+   <primary>jsonb_path_match</primary>
+  </indexterm>
+  <indexterm>
+   <primary>jsonb_path_query</primary>
+  </indexterm>
+  <indexterm>
+   <primary>jsonb_path_query_array</primary>
+  </indexterm>
+  <indexterm>
+   <primary>jsonb_path_query_first</primary>
+  </indexterm>
 
   <table id="functions-json-processing-table">
     <title>JSON Processing Functions</title>
@@ -12086,6 +12669,116 @@ table2-mapping
 </programlisting>
         </entry>
        </row>
+       <row>
+        <entry>
+         <para><literal>
+           jsonb_path_exists(target jsonb, path jsonpath [, vars jsonb, silent bool])
+         </literal></para>
+        </entry>
+        <entry><type>boolean</type></entry>
+        <entry>
+          Checks whether JSON path returns any item for the specified JSON
+          value.
+        </entry>
+        <entry>
+         <para><literal>
+           jsonb_path_exists('{"a":[1,2,3,4,5]}', '$.a[*] ? (@ >= $min &amp;&amp; @ &lt;= $max)', '{"min":2,"max":4}')
+         </literal></para>
+        </entry>
+        <entry>
+          <para><literal>true</literal></para>
+        </entry>
+       </row>
+       <row>
+        <entry>
+         <para><literal>
+           jsonb_path_match(target jsonb, path jsonpath [, vars jsonb, silent bool])
+         </literal></para>
+        </entry>
+        <entry><type>boolean</type></entry>
+        <entry>
+          Returns JSON path predicate result for the specified JSON value.
+          Only first result item is taken into account.  If there is no results
+          or first result item is not bool, then <literal>NULL</literal>
+          is returned.
+        </entry>
+        <entry>
+         <para><literal>
+           jsonb_path_match('{"a":[1,2,3,4,5]}', 'exists($.a[*] ? (@ >= $min &amp;&amp; @ &lt;= $max))', '{"min":2,"max":4}')
+        </literal></para>
+        </entry>
+        <entry>
+          <para><literal>true</literal></para>
+        </entry>
+       </row>
+       <row>
+        <entry>
+         <para><literal>
+           jsonb_path_query(target jsonb, path jsonpath [, vars jsonb, silent bool])
+         </literal></para>
+        </entry>
+        <entry><type>setof jsonb</type></entry>
+        <entry>
+          Gets all JSON items returned by JSON path for the specified JSON
+          value.
+        </entry>
+        <entry>
+         <para><literal>
+           select * jsonb_path_query('{"a":[1,2,3,4,5]}', '$.a[*] ? (@ >= $min &amp;&amp; @ &lt;= $max)', '{"min":2,"max":4}');
+         </literal></para>
+        </entry>
+        <entry>
+         <para>
+           <programlisting>
+ jsonb_path_query
+------------------
+ 2
+ 3
+ 4
+           </programlisting>
+         </para>
+        </entry>
+       </row>
+       <row>
+        <entry>
+         <para><literal>
+           jsonb_path_query_array(target jsonb, path jsonpath [, vars jsonb, silent bool])
+         </literal></para>
+        </entry>
+        <entry><type>jsonb</type></entry>
+        <entry>
+          Gets all JSON items returned by JSON path for the specified JSON
+          value and wraps result into an array.
+        </entry>
+        <entry>
+         <para><literal>
+           jsonb_path_query_array('{"a":[1,2,3,4,5]}', '$.a[*] ? (@ >= $min &amp;&amp; @ &lt;= $max)', '{"min":2,"max":4}')
+         </literal></para>
+        </entry>
+        <entry>
+          <para><literal>[2, 3, 4]</literal></para>
+        </entry>
+       </row>
+       <row>
+        <entry>
+         <para><literal>
+           jsonb_path_query_first(target jsonb, path jsonpath [, vars jsonb, silent bool])
+         </literal></para>
+        </entry>
+        <entry><type>jsonb</type></entry>
+        <entry>
+          Gets the first JSON item returned by JSON path for the specified JSON
+          value.  Returns <literal>NULL</literal> on no results.
+        </entry>
+        <entry>
+         <para><literal>
+           jsonb_path_query_first('{"a":[1,2,3,4,5]}', '$.a[*] ? (@ >= $min &amp;&amp; @ &lt;= $max)', '{"min":2,"max":4}')
+         </literal></para>
+        </entry>
+        <entry>
+          <para><literal>2</literal></para>
+        </entry>
+       </row>
      </tbody>
     </tgroup>
    </table>
@@ -12123,6 +12816,7 @@ table2-mapping
       JSON fields that do not appear in the target row type will be
       omitted from the output, and target columns that do not match any
       JSON field will simply be NULL.
+
     </para>
   </note>
 
@@ -12168,6 +12862,26 @@ table2-mapping
     </para>
   </note>
 
+  <note>
+   <para>
+    The <literal>jsonb_path_exists</literal>, <literal>jsonb_path_match</literal>,
+    <literal>jsonb_path_query</literal>, <literal>jsonb_path_query_array</literal> and
+    <literal>jsonb_path_query_first</literal>
+    functions have optional <literal>vars</literal> and <literal>silent</literal>
+    argument.
+   </para>
+   <para>
+    When <literal>vars</literal> argument is specified, it constitutes an object
+    contained variables to be substituted into <literal>jsonpath</literal>
+    expression.
+   </para>
+   <para>
+    When <literal>silent</literal> argument is specified and has
+    <literal>true</literal> value, the same errors are suppressed as it is in
+    the <literal>@?</literal> and <literal>@@</literal> operators.
+   </para>
+  </note>
+
   <para>
     See also <xref linkend="functions-aggregate"/> for the aggregate
     function <function>json_agg</function> which aggregates record
@@ -12177,6 +12891,7 @@ table2-mapping
     <function>jsonb_agg</function> and <function>jsonb_object_agg</function>.
   </para>
 
+ </sect2>
  </sect1>
 
  <sect1 id="functions-sequence">
diff --git a/doc/src/sgml/json.sgml b/doc/src/sgml/json.sgml
index e7b68fa..2eccf24 100644
--- a/doc/src/sgml/json.sgml
+++ b/doc/src/sgml/json.sgml
@@ -22,8 +22,16 @@
  </para>
 
  <para>
-  There are two JSON data types: <type>json</type> and <type>jsonb</type>.
-  They accept <emphasis>almost</emphasis> identical sets of values as
+  <productname>PostgreSQL</productname> offers two types for storing JSON
+  data: <type>json</type> and <type>jsonb</type>. To implement effective query
+  mechanisms for these data types, <productname>PostgreSQL</productname>
+  also provides the <type>jsonpath</type> data type described in
+  <xref linkend="datatype-jsonpath"/>.
+ </para>
+
+ <para>
+  The <type>json</type> and <type>jsonb</type> data types
+  accept <emphasis>almost</emphasis> identical sets of values as
   input.  The major practical difference is one of efficiency.  The
   <type>json</type> data type stores an exact copy of the input text,
   which processing functions must reparse on each execution; while
@@ -217,6 +225,11 @@ SELECT '{"reading": 1.230e-5}'::json, '{"reading": 1.230e-5}'::jsonb;
    in this example, even though those are semantically insignificant for
    purposes such as equality checks.
   </para>
+
+  <para>
+    For the list of built-in functions and operators available for
+    constructing and processing JSON values, see <xref linkend="functions-json"/>.
+  </para>
  </sect2>
 
  <sect2 id="json-doc-design">
@@ -593,4 +606,224 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
    lists, and scalars, as appropriate.
   </para>
  </sect2>
+
+ <sect2 id="datatype-jsonpath">
+  <title>jsonpath Type</title> 
+
+  <indexterm zone="datatype-jsonpath">
+   <primary>jsonpath</primary>
+  </indexterm>
+
+  <para>
+   The <type>jsonpath</type> type implements support for the SQL/JSON path language
+   in <productname>PostgreSQL</productname> to effectively query JSON data.
+   It provides a binary representation of the parsed SQL/JSON path
+   expression that specifies the items to be retrieved by the path
+   engine from the JSON data for further processing with the
+   SQL/JSON query functions.
+  </para>
+
+  <para>
+   The SQL/JSON path language is fully integrated into the SQL engine:
+   the semantics of its predicates and operators generally follow SQL.
+   At the same time, to provide a most natural way of working with JSON data,
+   SQL/JSON path syntax uses some of the JavaScript conventions:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     Dot <literal>.</literal> is used for member access.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     Square brackets <literal>[]</literal> are used for array access.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     SQL/JSON arrays are 0-relative, unlike regular SQL arrays that start from 1.
+    </para>
+   </listitem>
+  </itemizedlist>
+
+  <para>
+   An SQL/JSON path expression is an SQL character string literal,
+   so it must be enclosed in single quotes when passed to an SQL/JSON
+   query function. Following the JavaScript
+   conventions, character string literals within the path expression
+   must be enclosed in double quotes. Any single quotes within this
+   character string literal must be escaped with a single quote
+   by the SQL convention.
+  </para>
+
+  <para>
+   A path expression consists of a sequence of path elements,
+   which can be the following:
+   <itemizedlist>
+    <listitem>
+     <para>
+      Path literals of JSON primitive types:
+      Unicode text, numeric, true, false, or null.
+     </para>
+    </listitem>
+    <listitem>
+     <para>
+      Path variables listed in <xref linkend="type-jsonpath-variables"/>.
+     </para>
+    </listitem>
+    <listitem>
+     <para>
+      Accessor operators listed in <xref linkend="type-jsonpath-accessors"/>.
+     </para>
+    </listitem>
+    <listitem>
+     <para>
+      <type>jsonpath</type> operators and methods listed
+      in <xref linkend="functions-sqljson-path-operators"/>
+     </para>
+    </listitem>
+    <listitem>
+     <para>
+      Parentheses, which can be used to provide filter expressions
+      or define the order of path evaluation.
+     </para>
+    </listitem>
+   </itemizedlist>
+  </para>
+
+  <para>
+   For details on using <type>jsonpath</type> expressions with SQL/JSON
+   query functions, see <xref linkend="functions-sqljson-path"/>.
+  </para>
+
+  <table id="type-jsonpath-variables">
+   <title><type>jsonpath</type> Variables</title>
+   <tgroup cols="2">
+    <thead>
+     <row>
+      <entry>Variable</entry>
+      <entry>Description</entry>
+     </row>
+    </thead>
+    <tbody>
+     <row>
+      <entry><literal>$</literal></entry>
+      <entry>A variable representing the JSON text to be queried
+      (the <firstterm>context item</firstterm>).
+      </entry>
+     </row>
+     <row>
+      <entry><literal>$varname</literal></entry>
+      <entry>A named variable. Its value must be set in the
+      <command>PASSING</command> clause of an SQL/JSON query function.
+ <!-- TBD: See <xref linkend="sqljson-input-clause"/> -->
+      for details.
+      </entry>
+     </row>
+     <row>
+      <entry><literal>@</literal></entry>
+      <entry>A variable representing the result of path evaluation
+      in filter expressions.
+      </entry>
+     </row>
+    </tbody>
+   </tgroup>
+  </table>
+
+  <table id="type-jsonpath-accessors">
+   <title><type>jsonpath</type> Accessors</title>
+   <tgroup cols="2">
+    <thead>
+     <row>
+      <entry>Accessor Operator</entry>
+      <entry>Description</entry>
+     </row>
+    </thead>
+    <tbody>
+     <row>
+      <entry>
+       <para>
+        <literal>.<replaceable>key</replaceable></literal>
+       </para>
+       <para>
+        <literal>."$<replaceable>varname</replaceable>"</literal>
+       </para>
+      </entry>
+      <entry>
+       <para>
+        Member accessor that returns an object member with
+        the specified key. If the key name is a named variable
+        starting with <literal>$</literal> or does not meet the
+        JavaScript rules of an identifier, it must be enclosed in
+        double quotes as a character string literal.
+       </para>
+      </entry>
+     </row>
+     <row>
+      <entry>
+       <para>
+        <literal>.*</literal>
+       </para>
+      </entry>
+      <entry>
+       <para>
+        Wildcard member accessor that returns the values of all
+        members located at the top level of the current object.
+       </para>
+      </entry>
+     </row>
+     <row>
+      <entry>
+       <para>
+        <literal>.**</literal>
+       </para>
+      </entry>
+      <entry>
+       <para>
+        Recursive wildcard member accessor that processes all levels
+        of the JSON hierarchy of the current object and returns all
+        the member values, regardless of their nesting level. This
+        is a <productname>PostgreSQL</productname> extension of
+        the SQL/JSON standard.
+       </para>
+      </entry>
+     </row>
+     <row>
+      <entry>
+       <para>
+        <literal>[<replaceable>subscript</replaceable>, ...]</literal>
+       </para>
+       <para>
+        <literal>[<replaceable>subscript</replaceable> to last]</literal>
+       </para>
+      </entry>
+      <entry>
+       <para>
+        Array element accessor. The provided numeric subscripts return the
+        corresponding array elements. The first element in an array is
+        accessed with [0]. The <literal>last</literal> keyword denotes
+        the last subscript in an array and can be used to handle arrays
+        of unknown length.
+       </para>
+      </entry>
+     </row>
+     <row>
+      <entry>
+       <para>
+        <literal>[*]</literal>
+       </para>
+      </entry>
+      <entry>
+       <para>
+        Wildcard array element accessor that returns all array elements.
+       </para>
+      </entry>
+     </row>
+    </tbody>
+   </tgroup>
+  </table>
+
+ </sect2>
 </sect1>
diff --git a/src/backend/Makefile b/src/backend/Makefile
index 478a96d..31d9d66 100644
--- a/src/backend/Makefile
+++ b/src/backend/Makefile
@@ -136,6 +136,9 @@ parser/gram.h: parser/gram.y
 storage/lmgr/lwlocknames.h: storage/lmgr/generate-lwlocknames.pl storage/lmgr/lwlocknames.txt
 	$(MAKE) -C storage/lmgr lwlocknames.h lwlocknames.c
 
+utils/adt/jsonpath_gram.h: utils/adt/jsonpath_gram.y
+	$(MAKE) -C utils/adt jsonpath_gram.h
+
 # run this unconditionally to avoid needing to know its dependencies here:
 submake-catalog-headers:
 	$(MAKE) -C catalog distprep generated-header-symlinks
@@ -159,7 +162,7 @@ submake-utils-headers:
 
 .PHONY: generated-headers
 
-generated-headers: $(top_builddir)/src/include/parser/gram.h $(top_builddir)/src/include/storage/lwlocknames.h submake-catalog-headers submake-utils-headers
+generated-headers: $(top_builddir)/src/include/parser/gram.h $(top_builddir)/src/include/storage/lwlocknames.h $(top_builddir)/src/include/utils/jsonpath_gram.h submake-catalog-headers submake-utils-headers
 
 $(top_builddir)/src/include/parser/gram.h: parser/gram.h
 	prereqdir=`cd '$(dir $<)' >/dev/null && pwd` && \
@@ -171,6 +174,10 @@ $(top_builddir)/src/include/storage/lwlocknames.h: storage/lmgr/lwlocknames.h
 	  cd '$(dir $@)' && rm -f $(notdir $@) && \
 	  $(LN_S) "$$prereqdir/$(notdir $<)" .
 
+$(top_builddir)/src/include/utils/jsonpath_gram.h: utils/adt/jsonpath_gram.h
+	prereqdir=`cd '$(dir $<)' >/dev/null && pwd` && \
+	  cd '$(dir $@)' && rm -f $(notdir $@) && \
+	  $(LN_S) "$$prereqdir/$(notdir $<)" .
 
 utils/probes.o: utils/probes.d $(SUBDIROBJS)
 	$(DTRACE) $(DTRACEFLAGS) -C -G -s $(call expand_subsys,$^) -o $@
@@ -186,6 +193,7 @@ distprep:
 	$(MAKE) -C replication	repl_gram.c repl_scanner.c syncrep_gram.c syncrep_scanner.c
 	$(MAKE) -C storage/lmgr	lwlocknames.h lwlocknames.c
 	$(MAKE) -C utils	distprep
+	$(MAKE) -C utils/adt	jsonpath_gram.c jsonpath_gram.h jsonpath_scan.c
 	$(MAKE) -C utils/misc	guc-file.c
 	$(MAKE) -C utils/sort	qsort_tuple.c
 
@@ -308,6 +316,7 @@ maintainer-clean: distclean
 	      storage/lmgr/lwlocknames.c \
 	      storage/lmgr/lwlocknames.h \
 	      utils/misc/guc-file.c \
+	      utils/adt/jsonpath_gram.h \
 	      utils/sort/qsort_tuple.c

diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index 3e229c6..f5d11d5 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1127,6 +1127,46 @@ LANGUAGE INTERNAL
 STRICT IMMUTABLE PARALLEL SAFE
 AS 'jsonb_insert';
 
+CREATE OR REPLACE FUNCTION
+  jsonb_path_exists(target jsonb, path jsonpath, vars jsonb DEFAULT '{}',
+                    silent boolean DEFAULT false)
+RETURNS boolean
+LANGUAGE INTERNAL
+STRICT IMMUTABLE PARALLEL SAFE
+AS 'jsonb_path_exists';
+
+CREATE OR REPLACE FUNCTION
+  jsonb_path_match(target jsonb, path jsonpath, vars jsonb DEFAULT '{}',
+                   silent boolean DEFAULT false)
+RETURNS boolean
+LANGUAGE INTERNAL
+STRICT IMMUTABLE PARALLEL SAFE
+AS 'jsonb_path_match';
+
+CREATE OR REPLACE FUNCTION
+  jsonb_path_query(target jsonb, path jsonpath, vars jsonb DEFAULT '{}',
+                   silent boolean DEFAULT false)
+RETURNS SETOF jsonb
+LANGUAGE INTERNAL
+STRICT IMMUTABLE PARALLEL SAFE
+AS 'jsonb_path_query';
+
+CREATE OR REPLACE FUNCTION
+  jsonb_path_query_array(target jsonb, path jsonpath, vars jsonb DEFAULT '{}',
+                         silent boolean DEFAULT false)
+RETURNS jsonb
+LANGUAGE INTERNAL
+STRICT IMMUTABLE PARALLEL SAFE
+AS 'jsonb_path_query_array';
+
+CREATE OR REPLACE FUNCTION
+  jsonb_path_query_first(target jsonb, path jsonpath, vars jsonb DEFAULT '{}',
+                         silent boolean DEFAULT false)
+RETURNS jsonb
+LANGUAGE INTERNAL
+STRICT IMMUTABLE PARALLEL SAFE
+AS 'jsonb_path_query_first';
+
 --
 -- The default permissions for functions mean that anyone can execute them.
 -- A number of functions shouldn't be executable by just anyone, but rather
diff --git a/src/backend/utils/adt/.gitignore b/src/backend/utils/adt/.gitignore
new file mode 100644
index 0000000..7fab054
--- /dev/null
+++ b/src/backend/utils/adt/.gitignore
@@ -0,0 +1,3 @@
+/jsonpath_gram.h
+/jsonpath_gram.c
+/jsonpath_scan.c
diff --git a/src/backend/utils/adt/Makefile b/src/backend/utils/adt/Makefile
index 82d10af..6b24a9c 100644
--- a/src/backend/utils/adt/Makefile
+++ b/src/backend/utils/adt/Makefile
@@ -17,8 +17,8 @@ OBJS = acl.o amutils.o arrayfuncs.o array_expanded.o array_selfuncs.o \
 	float.o format_type.o formatting.o genfile.o \
 	geo_ops.o geo_selfuncs.o geo_spgist.o inet_cidr_ntop.o inet_net_pton.o \
 	int.o int8.o json.o jsonb.o jsonb_gin.o jsonb_op.o jsonb_util.o \
-	jsonfuncs.o like.o like_support.o lockfuncs.o \
-	mac.o mac8.o misc.o name.o \
+	jsonfuncs.o jsonpath_gram.o jsonpath_scan.o jsonpath.o jsonpath_exec.o \
+	like.o like_support.o lockfuncs.o mac.o mac8.o misc.o name.o \
 	network.o network_gist.o network_selfuncs.o network_spgist.o \
 	numeric.o numutils.o oid.o oracle_compat.o \
 	orderedsetaggs.o partitionfuncs.o pg_locale.o pg_lsn.o \
@@ -33,6 +33,21 @@ OBJS = acl.o amutils.o arrayfuncs.o array_expanded.o array_selfuncs.o \
 	txid.o uuid.o varbit.o varchar.o varlena.o version.o \
 	windowfuncs.o xid.o xml.o
 
+jsonpath_gram.c: BISONFLAGS += -d
+
+jsonpath_scan.c: FLEXFLAGS = -CF -p -p
+
+jsonpath_gram.h: jsonpath_gram.c ;
+
+# Force these dependencies to be known even without dependency info built:
+jsonpath_gram.o jsonpath_scan.o jsonpath_parser.o: jsonpath_gram.h
+
+# jsonpath_gram.c, jsonpath_gram.h, and jsonpath_scan.c are in the
+# distribution tarball, so they are not cleaned here.
+clean distclean maintainer-clean:
+	rm -f lex.backup
+
+
 like.o: like.c like_match.c
 
 varlena.o: varlena.c levenshtein.c
diff --git a/src/backend/utils/adt/jsonb.c b/src/backend/utils/adt/jsonb.c
index c02c856..7af4091 100644
--- a/src/backend/utils/adt/jsonb.c
+++ b/src/backend/utils/adt/jsonb.c
@@ -164,6 +164,55 @@ jsonb_send(PG_FUNCTION_ARGS)
 }
 
 /*
+ * Get the type name of a jsonb container.
+ */
+static const char *
+JsonbContainerTypeName(JsonbContainer *jbc)
+{
+	JsonbValue	scalar;
+
+	if (JsonbExtractScalar(jbc, &scalar))
+		return JsonbTypeName(&scalar);
+	else if (JsonContainerIsArray(jbc))
+		return "array";
+	else if (JsonContainerIsObject(jbc))
+		return "object";
+	else
+	{
+		elog(ERROR, "invalid jsonb container type: 0x%08x", jbc->header);
+		return "unknown";
+	}
+}
+
+/*
+ * Get the type name of a jsonb value.
+ */
+const char *
+JsonbTypeName(JsonbValue *jbv)
+{
+	switch (jbv->type)
+	{
+		case jbvBinary:
+			return JsonbContainerTypeName(jbv->val.binary.data);
+		case jbvObject:
+			return "object";
+		case jbvArray:
+			return "array";
+		case jbvNumeric:
+			return "number";
+		case jbvString:
+			return "string";
+		case jbvBool:
+			return "boolean";
+		case jbvNull:
+			return "null";
+		default:
+			elog(ERROR, "unrecognized jsonb value type: %d", jbv->type);
+			return "unknown";
+	}
+}
+
+/*
  * SQL function jsonb_typeof(jsonb) -> text
  *
  * This function is here because the analog json function is in json.c, since
@@ -173,45 +222,7 @@ Datum
 jsonb_typeof(PG_FUNCTION_ARGS)
 {
 	Jsonb	   *in = PG_GETARG_JSONB_P(0);
-	JsonbIterator *it;
-	JsonbValue	v;
-	char	   *result;
-
-	if (JB_ROOT_IS_OBJECT(in))
-		result = "object";
-	else if (JB_ROOT_IS_ARRAY(in) && !JB_ROOT_IS_SCALAR(in))
-		result = "array";
-	else
-	{
-		Assert(JB_ROOT_IS_SCALAR(in));
-
-		it = JsonbIteratorInit(&in->root);
-
-		/*
-		 * A root scalar is stored as an array of one element, so we get the
-		 * array and then its first (and only) member.
-		 */
-		(void) JsonbIteratorNext(&it, &v, true);
-		Assert(v.type == jbvArray);
-		(void) JsonbIteratorNext(&it, &v, true);
-		switch (v.type)
-		{
-			case jbvNull:
-				result = "null";
-				break;
-			case jbvString:
-				result = "string";
-				break;
-			case jbvNumeric:
-				result = "number";
-				break;
-			case jbvBool:
-				result = "boolean";
-				break;
-			default:
-				elog(ERROR, "unknown jsonb scalar type");
-		}
-	}
+	const char *result = JsonbContainerTypeName(&in->root);
 
 	PG_RETURN_TEXT_P(cstring_to_text(result));
 }
@@ -1857,7 +1868,7 @@ jsonb_object_agg_finalfn(PG_FUNCTION_ARGS)
 /*
  * Extract scalar value from raw-scalar pseudo-array jsonb.
  */
-static bool
+bool
 JsonbExtractScalar(JsonbContainer *jbc, JsonbValue *res)
 {
 	JsonbIterator *it;
diff --git a/src/backend/utils/adt/jsonb_util.c b/src/backend/utils/adt/jsonb_util.c
index 6695363..d8276ab 100644
--- a/src/backend/utils/adt/jsonb_util.c
+++ b/src/backend/utils/adt/jsonb_util.c
@@ -1728,6 +1728,14 @@ convertJsonbScalar(StringInfo buffer, JEntry *jentry, JsonbValue *scalarVal)
 			break;
 
 		case jbvNumeric:
+			/* replace numeric NaN with string "NaN" */
+			if (numeric_is_nan(scalarVal->val.numeric))
+			{
+				appendToBuffer(buffer, "NaN", 3);
+				*jentry = 3;
+				break;
+			}
+
 			numlen = VARSIZE_ANY(scalarVal->val.numeric);
 			padlen = padBufferToInt(buffer);
 
diff --git a/src/backend/utils/adt/jsonpath.c b/src/backend/utils/adt/jsonpath.c
new file mode 100644
index 0000000..0696b04
--- /dev/null
+++ b/src/backend/utils/adt/jsonpath.c
@@ -0,0 +1,1051 @@
+/*-------------------------------------------------------------------------
+ *
+ * jsonpath.c
+ *	 Input/output and supporting routines for jsonpath
+ *
+ * jsonpath expression is a chain of path items.  First path item is $, $var,
+ * literal or arithmetic expression.  Subsequent path items are accessors
+ * (.key, .*, [subscripts], [*]), filters (? (predicate)) and methods (.type(),
+ * .size() etc).
+ *
+ * For instance, structure of path items for simple expression:
+ *
+ *		$.a[*].type()
+ *
+ * is pretty evident:
+ *
+ *		$ => .a => [*] => .type()
+ *
+ * Some path items such as arithmetic operations, predicates or array
+ * subscripts may comprise subtrees.  For instance, more complex expression
+ *
+ *		($.a + $[1 to 5, 7] ? (@ > 3).double()).type()
+ *
+ * have following structure of path items:
+ *
+ *			   +  =>  .type()
+ *		  ___/ \___
+ *		 /		   \
+ *		$ => .a 	$  =>  []  =>	?  =>  .double()
+ *						  _||_		|
+ *						 /	  \ 	>
+ *						to	  to   / \
+ *					   / \	  /   @   3
+ *					  1   5  7
+ *
+ * Binary encoding of jsonpath constitutes a sequence of 4-bytes aligned
+ * variable-length path items connected by links.  Every item has a header
+ * consisting of item type (enum JsonPathItemType) and offset of next item
+ * (zero means no next item).  After the header, item may have payload
+ * depending on item type.  For instance, payload of '.key' accessor item is
+ * length of key name and key name itself.  Payload of '>' arithmetic operator
+ * item is offsets of right and left operands.
+ *
+ * So, binary representation of sample expression above is:
+ * (bottom arrows are next links, top lines are argument links)
+ *
+ *								  _____
+ *		 _____				  ___/____ \				__
+ *	  _ /_	  \ 		_____/__/____ \ \	   __    _ /_ \
+ *	 / /  \    \	   /	/  /	 \ \ \ 	  /  \  / /  \ \
+ * +(LR)  $ .a	$  [](* to *, * to *) 1 5 7 ?(A)  >(LR)   @ 3 .double() .type()
+ * |	  |  ^	|  ^|						 ^|					  ^		   ^
+ * |	  |__|	|__||________________________||___________________|		   |
+ * |_______________________________________________________________________|
+ *
+ * Copyright (c) 2019, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	src/backend/utils/adt/jsonpath.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "funcapi.h"
+#include "lib/stringinfo.h"
+#include "libpq/pqformat.h"
+#include "miscadmin.h"
+#include "utils/builtins.h"
+#include "utils/json.h"
+#include "utils/jsonpath.h"
+
+
+static Datum jsonPathFromCstring(char *in, int len);
+static char *jsonPathToCstring(StringInfo out, JsonPath *in,
+				  int estimated_len);
+static int flattenJsonPathParseItem(StringInfo buf, JsonPathParseItem *item,
+						 int nestingLevel, bool insideArraySubscript);
+static void alignStringInfoInt(StringInfo buf);
+static void printJsonPathItem(StringInfo buf, JsonPathItem *v, bool inKey,
+				  bool printBracketes);
+static int	operationPriority(JsonPathItemType op);
+
+
+/**************************** INPUT/OUTPUT ********************************/
+
+/*
+ * jsonpath type input function
+ */
+Datum
+jsonpath_in(PG_FUNCTION_ARGS)
+{
+	char	   *in = PG_GETARG_CSTRING(0);
+	int			len = strlen(in);
+
+	return jsonPathFromCstring(in, len);
+}
+
+/*
+ * jsonpath type recv function
+ *
+ * The type is sent as text in binary mode, so this is almost the same
+ * as the input function, but it's prefixed with a version number so we
+ * can change the binary format sent in future if necessary. For now,
+ * only version 1 is supported.
+ */
+Datum
+jsonpath_recv(PG_FUNCTION_ARGS)
+{
+	StringInfo	buf = (StringInfo) PG_GETARG_POINTER(0);
+	int			version = pq_getmsgint(buf, 1);
+	char	   *str;
+	int			nbytes;
+
+	if (version == 1)
+		str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
+	else
+		elog(ERROR, "unsupported jsonb version number %d", version);
+
+	return jsonPathFromCstring(str, nbytes);
+}
+
+/*
+ * jsonpath type output function
+ */
+Datum
+jsonpath_out(PG_FUNCTION_ARGS)
+{
+	JsonPath   *in = PG_GETARG_JSONPATH_P(0);
+
+	PG_RETURN_CSTRING(jsonPathToCstring(NULL, in, VARSIZE(in)));
+}
+
+/*
+ * jsonpath type send function
+ *
+ * Just send jsonpath as a version number, then a string of text
+ */
+Datum
+jsonpath_send(PG_FUNCTION_ARGS)
+{
+	JsonPath   *in = PG_GETARG_JSONPATH_P(0);
+	StringInfoData buf;
+	StringInfo	jtext = makeStringInfo();
+	int			version = 1;
+
+	(void) jsonPathToCstring(jtext, in, VARSIZE(in));
+
+	pq_begintypsend(&buf);
+	pq_sendint8(&buf, version);
+	pq_sendtext(&buf, jtext->data, jtext->len);
+	pfree(jtext->data);
+	pfree(jtext);
+
+	PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
+}
+
+/*
+ * Converts C-string to a jsonpath value.
+ *
+ * Uses jsonpath parser to turn string into an AST, then
+ * flattenJsonPathParseItem() does second pass turning AST into binary
+ * representation of jsonpath.
+ */
+static Datum
+jsonPathFromCstring(char *in, int len)
+{
+	JsonPathParseResult *jsonpath = parsejsonpath(in, len);
+	JsonPath   *res;
+	StringInfoData buf;
+
+	initStringInfo(&buf);
+	enlargeStringInfo(&buf, 4 * len /* estimation */ );
+
+	appendStringInfoSpaces(&buf, JSONPATH_HDRSZ);
+
+	if (!jsonpath)
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+				 errmsg("invalid input syntax for jsonpath: \"%s\"", in)));
+
+	flattenJsonPathParseItem(&buf, jsonpath->expr, 0, false);
+
+	res = (JsonPath *) buf.data;
+	SET_VARSIZE(res, buf.len);
+	res->header = JSONPATH_VERSION;
+	if (jsonpath->lax)
+		res->header |= JSONPATH_LAX;
+
+	PG_RETURN_JSONPATH_P(res);
+}
+
+/*
+ * Converts jsonpath value to a C-string.
+ *
+ * If 'out' argument is non-null, the resulting C-string is stored inside the
+ * StringBuffer.  The resulting string is always returned.
+ */
+static char *
+jsonPathToCstring(StringInfo out, JsonPath *in, int estimated_len)
+{
+	StringInfoData buf;
+	JsonPathItem v;
+
+	if (!out)
+	{
+		out = &buf;
+		initStringInfo(out);
+	}
+	enlargeStringInfo(out, estimated_len);
+
+	if (!(in->header & JSONPATH_LAX))
+		appendBinaryStringInfo(out, "strict ", 7);
+
+	jspInit(&v, in);
+	printJsonPathItem(out, &v, false, true);
+
+	return out->data;
+}
+
+/*
+ * Recursive function converting given jsonpath parse item and all its
+ * children into a binary representation.
+ */
+static int
+flattenJsonPathParseItem(StringInfo buf, JsonPathParseItem *item,
+						 int nestingLevel, bool insideArraySubscript)
+{
+	/* position from begining of jsonpath data */
+	int32		pos = buf->len - JSONPATH_HDRSZ;
+	int32		chld;
+	int32		next;
+	int			argNestingLevel = 0;
+
+	check_stack_depth();
+	CHECK_FOR_INTERRUPTS();
+
+	appendStringInfoChar(buf, (char) (item->type));
+	alignStringInfoInt(buf);
+
+	next = (item->next) ? buf->len : 0;
+
+	/*
+	 * Actual value will be recorded later, after next and children
+	 * processing.
+	 */
+	appendBinaryStringInfo(buf,
+						   (char *) &next,	/* fake value */
+						   sizeof(next));
+
+	switch (item->type)
+	{
+		case jpiString:
+		case jpiVariable:
+		case jpiKey:
+			appendBinaryStringInfo(buf, (char *) &item->value.string.len,
+								   sizeof(item->value.string.len));
+			appendBinaryStringInfo(buf, item->value.string.val,
+								   item->value.string.len);
+			appendStringInfoChar(buf, '\0');
+			break;
+		case jpiNumeric:
+			appendBinaryStringInfo(buf, (char *) item->value.numeric,
+								   VARSIZE(item->value.numeric));
+			break;
+		case jpiBool:
+			appendBinaryStringInfo(buf, (char *) &item->value.boolean,
+								   sizeof(item->value.boolean));
+			break;
+		case jpiAnd:
+		case jpiOr:
+		case jpiEqual:
+		case jpiNotEqual:
+		case jpiLess:
+		case jpiGreater:
+		case jpiLessOrEqual:
+		case jpiGreaterOrEqual:
+		case jpiAdd:
+		case jpiSub:
+		case jpiMul:
+		case jpiDiv:
+		case jpiMod:
+		case jpiStartsWith:
+			{
+				int32		left,
+							right;
+
+				left = buf->len;
+
+				/*
+				 * First, reserve place for left/right arg's positions, then
+				 * record both args and sets actual position in reserved
+				 * places.
+				 */
+				appendBinaryStringInfo(buf,
+									   (char *) &left,	/* fake value */
+									   sizeof(left));
+				right = buf->len;
+				appendBinaryStringInfo(buf,
+									   (char *) &right, /* fake value */
+									   sizeof(right));
+
+				chld = !item->value.args.left ? pos :
+					flattenJsonPathParseItem(buf, item->value.args.left,
+											 nestingLevel + argNestingLevel,
+											 insideArraySubscript);
+				*(int32 *) (buf->data + left) = chld - pos;
+				chld = !item->value.args.right ? pos :
+					flattenJsonPathParseItem(buf, item->value.args.right,
+											 nestingLevel + argNestingLevel,
+											 insideArraySubscript);
+				*(int32 *) (buf->data + right) = chld - pos;
+			}
+			break;
+		case jpiLikeRegex:
+			{
+				int32		offs;
+
+				appendBinaryStringInfo(buf,
+									   (char *) &item->value.like_regex.flags,
+									   sizeof(item->value.like_regex.flags));
+				offs = buf->len;
+				appendBinaryStringInfo(buf,
+									   (char *) &offs,	/* fake value */
+									   sizeof(offs));
+				appendBinaryStringInfo(buf,
+									   (char *) &item->value.like_regex.patternlen,
+									   sizeof(item->value.like_regex.patternlen));
+				appendBinaryStringInfo(buf, item->value.like_regex.pattern,
+									   item->value.like_regex.patternlen);
+				appendStringInfoChar(buf, '\0');
+
+				chld = flattenJsonPathParseItem(buf, item->value.like_regex.expr,
+												nestingLevel,
+												insideArraySubscript);
+				*(int32 *) (buf->data + offs) = chld - pos;
+			}
+			break;
+		case jpiFilter:
+			argNestingLevel++;
+			/* fall through */
+		case jpiIsUnknown:
+		case jpiNot:
+		case jpiPlus:
+		case jpiMinus:
+		case jpiExists:
+			{
+				int32		arg;
+
+				arg = buf->len;
+				appendBinaryStringInfo(buf,
+									   (char *) &arg,	/* fake value */
+									   sizeof(arg));
+
+				chld = flattenJsonPathParseItem(buf, item->value.arg,
+												nestingLevel + argNestingLevel,
+												insideArraySubscript);
+				*(int32 *) (buf->data + arg) = chld - pos;
+			}
+			break;
+		case jpiNull:
+			break;
+		case jpiRoot:
+			break;
+		case jpiAnyArray:
+		case jpiAnyKey:
+			break;
+		case jpiCurrent:
+			if (nestingLevel <= 0)
+				ereport(ERROR,
+						(errcode(ERRCODE_SYNTAX_ERROR),
+						 errmsg("@ is not allowed in root expressions")));
+			break;
+		case jpiLast:
+			if (!insideArraySubscript)
+				ereport(ERROR,
+						(errcode(ERRCODE_SYNTAX_ERROR),
+						 errmsg("LAST is allowed only in array subscripts")));
+			break;
+		case jpiIndexArray:
+			{
+				int32		nelems = item->value.array.nelems;
+				int			offset;
+				int			i;
+
+				appendBinaryStringInfo(buf, (char *) &nelems, sizeof(nelems));
+
+				offset = buf->len;
+
+				appendStringInfoSpaces(buf, sizeof(int32) * 2 * nelems);
+
+				for (i = 0; i < nelems; i++)
+				{
+					int32	   *ppos;
+					int32		topos;
+					int32		frompos =
+					flattenJsonPathParseItem(buf,
+											 item->value.array.elems[i].from,
+											 nestingLevel, true) - pos;
+
+					if (item->value.array.elems[i].to)
+						topos = flattenJsonPathParseItem(buf,
+														 item->value.array.elems[i].to,
+														 nestingLevel, true) - pos;
+					else
+						topos = 0;
+
+					ppos = (int32 *) &buf->data[offset + i * 2 * sizeof(int32)];
+
+					ppos[0] = frompos;
+					ppos[1] = topos;
+				}
+			}
+			break;
+		case jpiAny:
+			appendBinaryStringInfo(buf,
+								   (char *) &item->value.anybounds.first,
+								   sizeof(item->value.anybounds.first));
+			appendBinaryStringInfo(buf,
+								   (char *) &item->value.anybounds.last,
+								   sizeof(item->value.anybounds.last));
+			break;
+		case jpiType:
+		case jpiSize:
+		case jpiAbs:
+		case jpiFloor:
+		case jpiCeiling:
+		case jpiDouble:
+		case jpiKeyValue:
+			break;
+		default:
+			elog(ERROR, "unrecognized jsonpath item type: %d", item->type);
+	}
+
+	if (item->next)
+	{
+		chld = flattenJsonPathParseItem(buf, item->next, nestingLevel,
+										insideArraySubscript) - pos;
+		*(int32 *) (buf->data + next) = chld;
+	}
+
+	return pos;
+}
+
+/*
+ * Aling StringInfo to int by adding zero padding bytes
+ */
+static void
+alignStringInfoInt(StringInfo buf)
+{
+	switch (INTALIGN(buf->len) - buf->len)
+	{
+		case 3:
+			appendStringInfoCharMacro(buf, 0);
+		case 2:
+			appendStringInfoCharMacro(buf, 0);
+		case 1:
+			appendStringInfoCharMacro(buf, 0);
+		default:
+			break;
+	}
+}
+
+/*
+ * Prints text representation of given jsonpath item and all its children.
+ */
+static void
+printJsonPathItem(StringInfo buf, JsonPathItem *v, bool inKey,
+				  bool printBracketes)
+{
+	JsonPathItem elem;
+	int			i;
+
+	check_stack_depth();
+
+	switch (v->type)
+	{
+		case jpiNull:
+			appendStringInfoString(buf, "null");
+			break;
+		case jpiKey:
+			if (inKey)
+				appendStringInfoChar(buf, '.');
+			escape_json(buf, jspGetString(v, NULL));
+			break;
+		case jpiString:
+			escape_json(buf, jspGetString(v, NULL));
+			break;
+		case jpiVariable:
+			appendStringInfoChar(buf, '$');
+			escape_json(buf, jspGetString(v, NULL));
+			break;
+		case jpiNumeric:
+			appendStringInfoString(buf,
+								   DatumGetCString(DirectFunctionCall1(numeric_out,
+																	   PointerGetDatum(jspGetNumeric(v)))));
+			break;
+		case jpiBool:
+			if (jspGetBool(v))
+				appendBinaryStringInfo(buf, "true", 4);
+			else
+				appendBinaryStringInfo(buf, "false", 5);
+			break;
+		case jpiAnd:
+		case jpiOr:
+		case jpiEqual:
+		case jpiNotEqual:
+		case jpiLess:
+		case jpiGreater:
+		case jpiLessOrEqual:
+		case jpiGreaterOrEqual:
+		case jpiAdd:
+		case jpiSub:
+		case jpiMul:
+		case jpiDiv:
+		case jpiMod:
+		case jpiStartsWith:
+			if (printBracketes)
+				appendStringInfoChar(buf, '(');
+			jspGetLeftArg(v, &elem);
+			printJsonPathItem(buf, &elem, false,
+							  operationPriority(elem.type) <=
+							  operationPriority(v->type));
+			appendStringInfoChar(buf, ' ');
+			appendStringInfoString(buf, jspOperationName(v->type));
+			appendStringInfoChar(buf, ' ');
+			jspGetRightArg(v, &elem);
+			printJsonPathItem(buf, &elem, false,
+							  operationPriority(elem.type) <=
+							  operationPriority(v->type));
+			if (printBracketes)
+				appendStringInfoChar(buf, ')');
+			break;
+		case jpiLikeRegex:
+			if (printBracketes)
+				appendStringInfoChar(buf, '(');
+
+			jspInitByBuffer(&elem, v->base, v->content.like_regex.expr);
+			printJsonPathItem(buf, &elem, false,
+							  operationPriority(elem.type) <=
+							  operationPriority(v->type));
+
+			appendBinaryStringInfo(buf, " like_regex ", 12);
+
+			escape_json(buf, v->content.like_regex.pattern);
+
+			if (v->content.like_regex.flags)
+			{
+				appendBinaryStringInfo(buf, " flag \"", 7);
+
+				if (v->content.like_regex.flags & JSP_REGEX_ICASE)
+					appendStringInfoChar(buf, 'i');
+				if (v->content.like_regex.flags & JSP_REGEX_SLINE)
+					appendStringInfoChar(buf, 's');
+				if (v->content.like_regex.flags & JSP_REGEX_MLINE)
+					appendStringInfoChar(buf, 'm');
+				if (v->content.like_regex.flags & JSP_REGEX_WSPACE)
+					appendStringInfoChar(buf, 'x');
+
+				appendStringInfoChar(buf, '"');
+			}
+
+			if (printBracketes)
+				appendStringInfoChar(buf, ')');
+			break;
+		case jpiPlus:
+		case jpiMinus:
+			if (printBracketes)
+				appendStringInfoChar(buf, '(');
+			appendStringInfoChar(buf, v->type == jpiPlus ? '+' : '-');
+			jspGetArg(v, &elem);
+			printJsonPathItem(buf, &elem, false,
+							  operationPriority(elem.type) <=
+							  operationPriority(v->type));
+			if (printBracketes)
+				appendStringInfoChar(buf, ')');
+			break;
+		case jpiFilter:
+			appendBinaryStringInfo(buf, "?(", 2);
+			jspGetArg(v, &elem);
+			printJsonPathItem(buf, &elem, false, false);
+			appendStringInfoChar(buf, ')');
+			break;
+		case jpiNot:
+			appendBinaryStringInfo(buf, "!(", 2);
+			jspGetArg(v, &elem);
+			printJsonPathItem(buf, &elem, false, false);
+			appendStringInfoChar(buf, ')');
+			break;
+		case jpiIsUnknown:
+			appendStringInfoChar(buf, '(');
+			jspGetArg(v, &elem);
+			printJsonPathItem(buf, &elem, false, false);
+			appendBinaryStringInfo(buf, ") is unknown", 12);
+			break;
+		case jpiExists:
+			appendBinaryStringInfo(buf, "exists (", 8);
+			jspGetArg(v, &elem);
+			printJsonPathItem(buf, &elem, false, false);
+			appendStringInfoChar(buf, ')');
+			break;
+		case jpiCurrent:
+			Assert(!inKey);
+			appendStringInfoChar(buf, '@');
+			break;
+		case jpiRoot:
+			Assert(!inKey);
+			appendStringInfoChar(buf, '$');
+			break;
+		case jpiLast:
+			appendBinaryStringInfo(buf, "last", 4);
+			break;
+		case jpiAnyArray:
+			appendBinaryStringInfo(buf, "[*]", 3);
+			break;
+		case jpiAnyKey:
+			if (inKey)
+				appendStringInfoChar(buf, '.');
+			appendStringInfoChar(buf, '*');
+			break;
+		case jpiIndexArray:
+			appendStringInfoChar(buf, '[');
+			for (i = 0; i < v->content.array.nelems; i++)
+			{
+				JsonPathItem from;
+				JsonPathItem to;
+				bool		range = jspGetArraySubscript(v, &from, &to, i);
+
+				if (i)
+					appendStringInfoChar(buf, ',');
+
+				printJsonPathItem(buf, &from, false, false);
+
+				if (range)
+				{
+					appendBinaryStringInfo(buf, " to ", 4);
+					printJsonPathItem(buf, &to, false, false);
+				}
+			}
+			appendStringInfoChar(buf, ']');
+			break;
+		case jpiAny:
+			if (inKey)
+				appendStringInfoChar(buf, '.');
+
+			if (v->content.anybounds.first == 0 &&
+				v->content.anybounds.last == PG_UINT32_MAX)
+				appendBinaryStringInfo(buf, "**", 2);
+			else if (v->content.anybounds.first == v->content.anybounds.last)
+			{
+				if (v->content.anybounds.first == PG_UINT32_MAX)
+					appendStringInfo(buf, "**{last}");
+				else
+					appendStringInfo(buf, "**{%u}",
+									 v->content.anybounds.first);
+			}
+			else if (v->content.anybounds.first == PG_UINT32_MAX)
+				appendStringInfo(buf, "**{last to %u}",
+								 v->content.anybounds.last);
+			else if (v->content.anybounds.last == PG_UINT32_MAX)
+				appendStringInfo(buf, "**{%u to last}",
+								 v->content.anybounds.first);
+			else
+				appendStringInfo(buf, "**{%u to %u}",
+								 v->content.anybounds.first,
+								 v->content.anybounds.last);
+			break;
+		case jpiType:
+			appendBinaryStringInfo(buf, ".type()", 7);
+			break;
+		case jpiSize:
+			appendBinaryStringInfo(buf, ".size()", 7);
+			break;
+		case jpiAbs:
+			appendBinaryStringInfo(buf, ".abs()", 6);
+			break;
+		case jpiFloor:
+			appendBinaryStringInfo(buf, ".floor()", 8);
+			break;
+		case jpiCeiling:
+			appendBinaryStringInfo(buf, ".ceiling()", 10);
+			break;
+		case jpiDouble:
+			appendBinaryStringInfo(buf, ".double()", 9);
+			break;
+		case jpiKeyValue:
+			appendBinaryStringInfo(buf, ".keyvalue()", 11);
+			break;
+		default:
+			elog(ERROR, "unrecognized jsonpath item type: %d", v->type);
+	}
+
+	if (jspGetNext(v, &elem))
+		printJsonPathItem(buf, &elem, true, true);
+}
+
+const char *
+jspOperationName(JsonPathItemType type)
+{
+	switch (type)
+	{
+		case jpiAnd:
+			return "&&";
+		case jpiOr:
+			return "||";
+		case jpiEqual:
+			return "==";
+		case jpiNotEqual:
+			return "!=";
+		case jpiLess:
+			return "<";
+		case jpiGreater:
+			return ">";
+		case jpiLessOrEqual:
+			return "<=";
+		case jpiGreaterOrEqual:
+			return ">=";
+		case jpiPlus:
+		case jpiAdd:
+			return "+";
+		case jpiMinus:
+		case jpiSub:
+			return "-";
+		case jpiMul:
+			return "*";
+		case jpiDiv:
+			return "/";
+		case jpiMod:
+			return "%";
+		case jpiStartsWith:
+			return "starts with";
+		case jpiLikeRegex:
+			return "like_regex";
+		case jpiType:
+			return "type";
+		case jpiSize:
+			return "size";
+		case jpiKeyValue:
+			return "keyvalue";
+		case jpiDouble:
+			return "double";
+		case jpiAbs:
+			return "abs";
+		case jpiFloor:
+			return "floor";
+		case jpiCeiling:
+			return "ceiling";
+		default:
+			elog(ERROR, "unrecognized jsonpath item type: %d", type);
+			return NULL;
+	}
+}
+
+static int
+operationPriority(JsonPathItemType op)
+{
+	switch (op)
+	{
+		case jpiOr:
+			return 0;
+		case jpiAnd:
+			return 1;
+		case jpiEqual:
+		case jpiNotEqual:
+		case jpiLess:
+		case jpiGreater:
+		case jpiLessOrEqual:
+		case jpiGreaterOrEqual:
+		case jpiStartsWith:
+			return 2;
+		case jpiAdd:
+		case jpiSub:
+			return 3;
+		case jpiMul:
+		case jpiDiv:
+		case jpiMod:
+			return 4;
+		case jpiPlus:
+		case jpiMinus:
+			return 5;
+		default:
+			return 6;
+	}
+}
+
+/******************* Support functions for JsonPath *************************/
+
+/*
+ * Support macros to read stored values
+ */
+
+#define read_byte(v, b, p) do {			\
+	(v) = *(uint8*)((b) + (p));			\
+	(p) += 1;							\
+} while(0)								\
+
+#define read_int32(v, b, p) do {		\
+	(v) = *(uint32*)((b) + (p));		\
+	(p) += sizeof(int32);				\
+} while(0)								\
+
+#define read_int32_n(v, b, p, n) do {	\
+	(v) = (void *)((b) + (p));			\
+	(p) += sizeof(int32) * (n);			\
+} while(0)								\
+
+/*
+ * Read root node and fill root node representation
+ */
+void
+jspInit(JsonPathItem *v, JsonPath *js)
+{
+	Assert((js->header & ~JSONPATH_LAX) == JSONPATH_VERSION);
+	jspInitByBuffer(v, js->data, 0);
+}
+
+/*
+ * Read node from buffer and fill its representation
+ */
+void
+jspInitByBuffer(JsonPathItem *v, char *base, int32 pos)
+{
+	v->base = base + pos;
+
+	read_byte(v->type, base, pos);
+	pos = INTALIGN((uintptr_t) (base + pos)) - (uintptr_t) base;
+	read_int32(v->nextPos, base, pos);
+
+	switch (v->type)
+	{
+		case jpiNull:
+		case jpiRoot:
+		case jpiCurrent:
+		case jpiAnyArray:
+		case jpiAnyKey:
+		case jpiType:
+		case jpiSize:
+		case jpiAbs:
+		case jpiFloor:
+		case jpiCeiling:
+		case jpiDouble:
+		case jpiKeyValue:
+		case jpiLast:
+			break;
+		case jpiKey:
+		case jpiString:
+		case jpiVariable:
+			read_int32(v->content.value.datalen, base, pos);
+			/* follow next */
+		case jpiNumeric:
+		case jpiBool:
+			v->content.value.data = base + pos;
+			break;
+		case jpiAnd:
+		case jpiOr:
+		case jpiAdd:
+		case jpiSub:
+		case jpiMul:
+		case jpiDiv:
+		case jpiMod:
+		case jpiEqual:
+		case jpiNotEqual:
+		case jpiLess:
+		case jpiGreater:
+		case jpiLessOrEqual:
+		case jpiGreaterOrEqual:
+		case jpiStartsWith:
+			read_int32(v->content.args.left, base, pos);
+			read_int32(v->content.args.right, base, pos);
+			break;
+		case jpiLikeRegex:
+			read_int32(v->content.like_regex.flags, base, pos);
+			read_int32(v->content.like_regex.expr, base, pos);
+			read_int32(v->content.like_regex.patternlen, base, pos);
+			v->content.like_regex.pattern = base + pos;
+			break;
+		case jpiNot:
+		case jpiExists:
+		case jpiIsUnknown:
+		case jpiPlus:
+		case jpiMinus:
+		case jpiFilter:
+			read_int32(v->content.arg, base, pos);
+			break;
+		case jpiIndexArray:
+			read_int32(v->content.array.nelems, base, pos);
+			read_int32_n(v->content.array.elems, base, pos,
+						 v->content.array.nelems * 2);
+			break;
+		case jpiAny:
+			read_int32(v->content.anybounds.first, base, pos);
+			read_int32(v->content.anybounds.last, base, pos);
+			break;
+		default:
+			elog(ERROR, "unrecognized jsonpath item type: %d", v->type);
+	}
+}
+
+void
+jspGetArg(JsonPathItem *v, JsonPathItem *a)
+{
+	Assert(v->type == jpiFilter ||
+		   v->type == jpiNot ||
+		   v->type == jpiIsUnknown ||
+		   v->type == jpiExists ||
+		   v->type == jpiPlus ||
+		   v->type == jpiMinus);
+
+	jspInitByBuffer(a, v->base, v->content.arg);
+}
+
+bool
+jspGetNext(JsonPathItem *v, JsonPathItem *a)
+{
+	if (jspHasNext(v))
+	{
+		Assert(v->type == jpiString ||
+			   v->type == jpiNumeric ||
+			   v->type == jpiBool ||
+			   v->type == jpiNull ||
+			   v->type == jpiKey ||
+			   v->type == jpiAny ||
+			   v->type == jpiAnyArray ||
+			   v->type == jpiAnyKey ||
+			   v->type == jpiIndexArray ||
+			   v->type == jpiFilter ||
+			   v->type == jpiCurrent ||
+			   v->type == jpiExists ||
+			   v->type == jpiRoot ||
+			   v->type == jpiVariable ||
+			   v->type == jpiLast ||
+			   v->type == jpiAdd ||
+			   v->type == jpiSub ||
+			   v->type == jpiMul ||
+			   v->type == jpiDiv ||
+			   v->type == jpiMod ||
+			   v->type == jpiPlus ||
+			   v->type == jpiMinus ||
+			   v->type == jpiEqual ||
+			   v->type == jpiNotEqual ||
+			   v->type == jpiGreater ||
+			   v->type == jpiGreaterOrEqual ||
+			   v->type == jpiLess ||
+			   v->type == jpiLessOrEqual ||
+			   v->type == jpiAnd ||
+			   v->type == jpiOr ||
+			   v->type == jpiNot ||
+			   v->type == jpiIsUnknown ||
+			   v->type == jpiType ||
+			   v->type == jpiSize ||
+			   v->type == jpiAbs ||
+			   v->type == jpiFloor ||
+			   v->type == jpiCeiling ||
+			   v->type == jpiDouble ||
+			   v->type == jpiKeyValue ||
+			   v->type == jpiStartsWith);
+
+		if (a)
+			jspInitByBuffer(a, v->base, v->nextPos);
+		return true;
+	}
+
+	return false;
+}
+
+void
+jspGetLeftArg(JsonPathItem *v, JsonPathItem *a)
+{
+	Assert(v->type == jpiAnd ||
+		   v->type == jpiOr ||
+		   v->type == jpiEqual ||
+		   v->type == jpiNotEqual ||
+		   v->type == jpiLess ||
+		   v->type == jpiGreater ||
+		   v->type == jpiLessOrEqual ||
+		   v->type == jpiGreaterOrEqual ||
+		   v->type == jpiAdd ||
+		   v->type == jpiSub ||
+		   v->type == jpiMul ||
+		   v->type == jpiDiv ||
+		   v->type == jpiMod ||
+		   v->type == jpiStartsWith);
+
+	jspInitByBuffer(a, v->base, v->content.args.left);
+}
+
+void
+jspGetRightArg(JsonPathItem *v, JsonPathItem *a)
+{
+	Assert(v->type == jpiAnd ||
+		   v->type == jpiOr ||
+		   v->type == jpiEqual ||
+		   v->type == jpiNotEqual ||
+		   v->type == jpiLess ||
+		   v->type == jpiGreater ||
+		   v->type == jpiLessOrEqual ||
+		   v->type == jpiGreaterOrEqual ||
+		   v->type == jpiAdd ||
+		   v->type == jpiSub ||
+		   v->type == jpiMul ||
+		   v->type == jpiDiv ||
+		   v->type == jpiMod ||
+		   v->type == jpiStartsWith);
+
+	jspInitByBuffer(a, v->base, v->content.args.right);
+}
+
+bool
+jspGetBool(JsonPathItem *v)
+{
+	Assert(v->type == jpiBool);
+
+	return (bool) *v->content.value.data;
+}
+
+Numeric
+jspGetNumeric(JsonPathItem *v)
+{
+	Assert(v->type == jpiNumeric);
+
+	return (Numeric) v->content.value.data;
+}
+
+char *
+jspGetString(JsonPathItem *v, int32 *len)
+{
+	Assert(v->type == jpiKey ||
+		   v->type == jpiString ||
+		   v->type == jpiVariable);
+
+	if (len)
+		*len = v->content.value.datalen;
+	return v->content.value.data;
+}
+
+bool
+jspGetArraySubscript(JsonPathItem *v, JsonPathItem *from, JsonPathItem *to,
+					 int i)
+{
+	Assert(v->type == jpiIndexArray);
+
+	jspInitByBuffer(from, v->base, v->content.array.elems[i].from);
+
+	if (!v->content.array.elems[i].to)
+		return false;
+
+	jspInitByBuffer(to, v->base, v->content.array.elems[i].to);
+
+	return true;
+}
diff --git a/src/backend/utils/adt/jsonpath_exec.c b/src/backend/utils/adt/jsonpath_exec.c
new file mode 100644
index 0000000..87f432b
--- /dev/null
+++ b/src/backend/utils/adt/jsonpath_exec.c
@@ -0,0 +1,2273 @@
+/*-------------------------------------------------------------------------
+ *
+ * jsonpath_exec.c
+ *	 Routines for SQL/JSON path execution.
+ *
+ * Jsonpath is executed in the global context stored in JsonPathExecContext,
+ * which is passed to almost every function involved into execution.  Entry
+ * point for jsonpath execution is executeJsonPath() function, which
+ * initializes execution context including initial JsonPathItem and JsonbValue,
+ * flags, stack for calculation of @ in filters.
+ *
+ * The result of jsonpath query execution is enum JsonPathExecResult and
+ * if succeeded sequence of JsonbValue, written to JsonValueList *found, which
+ * is passed through the jsonpath items.  When found == NULL, we're inside
+ * exists-query and we're interested only in whether result is empty.  In this
+ * case execution is stopped once first result item is found, and the only
+ * execution result is JsonPathExecResult.  The values of JsonPathExecResult
+ * are following:
+ * - jperOk			-- result sequence is not empty
+ * - jperNotFound	-- result sequence is empty
+ * - jperError		-- error occurred during execution
+ *
+ * Jsonpath is executed recursively (see recursiveExecute()) starting form the
+ * first path item (which in turn might be, for instance, an arithmetic
+ * expression evaluated separately).  On each step single JsonbValue obtained
+ * from previous path item is processed.  The result of processing is a
+ * sequence of JsonbValue (probably empty), which is passed to the next path
+ * item one by one.  When there is no next path item, then JsonbValue is added
+ * to the 'found' list.  When found == NULL, then execution functions just
+ * return jperOk (see recursiveExecuteNext()).
+ *
+ * Many of jsonpath operations require automatic unwrapping of arrays in lax
+ * mode.  So, if input value is array, then corresponding operation is
+ * processed not on array itself, but on all of its members one by one.
+ * recursiveExecuteUnwrap() function have 'unwrap' argument, which indicates
+ * whether unwrapping of array is needed.  When unwrap == true, each of array
+ * members is passed to recursiveExecuteUnwrap() again but with unwrap == false
+ * in order to evade subsequent array unwrapping.
+ *
+ * All boolean expressions (predicates) are evaluated by recursiveExecuteBool()
+ * function, which returns tri-state JsonPathBool.  When error is occurred
+ * during predicate execution, it returns jpbUnknown.  According to standard
+ * predicates can be only inside filters.  But we support their usage as
+ * jsonpath expression.  This helps us to implement @@ operator.  In this case
+ * resulting JsonPathBool is transformed into jsonb bool or null.
+ *
+ * Arithmetic and boolean expression are evaluated recursively from expression
+ * tree top down to the leaves.  Therefore, for binary arithmetic expressions
+ * we calculate operands first.  Then we check that results are numeric
+ * singleton lists, calculate the result and pass it to the next path item.
+ *
+ * Copyright (c) 2019, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	src/backend/utils/adt/jsonpath_exec.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "catalog/pg_collation.h"
+#include "catalog/pg_type.h"
+#include "funcapi.h"
+#include "lib/stringinfo.h"
+#include "miscadmin.h"
+#include "regex/regex.h"
+#include "utils/builtins.h"
+#include "utils/datum.h"
+#include "utils/formatting.h"
+#include "utils/float.h"
+#include "utils/guc.h"
+#include "utils/json.h"
+#include "utils/jsonpath.h"
+#include "utils/date.h"
+#include "utils/timestamp.h"
+#include "utils/varlena.h"
+
+
+/* Standard error message for SQL/JSON errors */
+#define ERRMSG_JSON_ARRAY_NOT_FOUND			"SQL/JSON array not found"
+#define ERRMSG_JSON_OBJECT_NOT_FOUND		"SQL/JSON object not found"
+#define ERRMSG_JSON_MEMBER_NOT_FOUND		"SQL/JSON member not found"
+#define ERRMSG_JSON_NUMBER_NOT_FOUND		"SQL/JSON number not found"
+#define ERRMSG_JSON_SCALAR_REQUIRED			"SQL/JSON scalar required"
+#define ERRMSG_SINGLETON_JSON_ITEM_REQUIRED	"singleton SQL/JSON item required"
+#define ERRMSG_NON_NUMERIC_JSON_ITEM		"non-numeric SQL/JSON item"
+#define ERRMSG_INVALID_JSON_SUBSCRIPT		"invalid SQL/JSON subscript"
+
+/*
+ * Represents "base object" and it's "id" for .keyvalue() evaluation.
+ */
+typedef struct JsonBaseObjectInfo
+{
+	JsonbContainer *jbc;
+	int			id;
+} JsonBaseObjectInfo;
+
+/*
+ * Context of jsonpath execution.
+ */
+typedef struct JsonPathExecContext
+{
+	Jsonb	   *vars;			/* variables to substitute into jsonpath */
+	JsonbValue *root;			/* for $ evaluation */
+	JsonbValue *current;		/* for @ evaluation */
+	JsonBaseObjectInfo baseObject;	/* "base object" for .keyvalue()
+									 * evaluation */
+	int			lastGeneratedObjectId;	/* "id" counter for .keyvalue()
+										 * evaluation */
+	int			innermostArraySize; /* for LAST array index evaluation */
+	bool		laxMode;		/* true for "lax" mode, false for "strict"
+								 * mode */
+	bool		ignoreStructuralErrors; /* with "true" structural errors such
+										 * as absence of required json item or
+										 * unexpected json item type are
+										 * ignored */
+	bool		throwErrors;	/* with "false" all suppressible errors are
+								 * suppressed */
+} JsonPathExecContext;
+
+/* Context for LIKE_REGEX execution. */
+typedef struct JsonLikeRegexContext
+{
+	text	   *regex;
+	int			cflags;
+} JsonLikeRegexContext;
+
+/* Result of jsonpath predicate evaluation */
+typedef enum JsonPathBool
+{
+	jpbFalse = 0,
+	jpbTrue = 1,
+	jpbUnknown = 2
+} JsonPathBool;
+
+/* Result of jsonpath expression evaluation */
+typedef enum JsonPathExecResult
+{
+	jperOk = 0,
+	jperNotFound = 1,
+	jperError = 2
+} JsonPathExecResult;
+
+#define jperIsError(jper)			((jper) == jperError)
+
+/*
+ * List of jsonb values with shortcut for single-value list.
+ */
+typedef struct JsonValueList
+{
+	JsonbValue *singleton;
+	List	   *list;
+} JsonValueList;
+
+typedef struct JsonValueListIterator
+{
+	JsonbValue *value;
+	ListCell   *next;
+} JsonValueListIterator;
+
+/* strict/lax flags is decomposed into four [un]wrap/error flags */
+#define jspStrictAbsenseOfErrors(cxt)	(!(cxt)->laxMode)
+#define jspAutoUnwrap(cxt)				((cxt)->laxMode)
+#define jspAutoWrap(cxt)				((cxt)->laxMode)
+#define jspIgnoreStructuralErrors(cxt)	((cxt)->ignoreStructuralErrors)
+#define jspThrowErrors(cxt)				((cxt)->throwErrors)
+
+#define RETURN_ERROR(error) \
+do { \
+	if (jspThrowErrors(cxt)) \
+		error; \
+	else \
+		return jperError; \
+} while (0)
+
+typedef JsonPathBool (*JsonPathPredicateCallback) (JsonPathItem *jsp,
+												   JsonbValue *larg,
+												   JsonbValue *rarg,
+												   void *param);
+
+static JsonPathExecResult executeJsonPath(JsonPath *path, Jsonb *vars,
+				Jsonb *json, bool throwErrors, JsonValueList *result);
+static JsonPathExecResult recursiveExecute(JsonPathExecContext *cxt,
+				 JsonPathItem *jsp, JsonbValue *jb, JsonValueList *found);
+static JsonPathExecResult recursiveExecuteUnwrap(JsonPathExecContext *cxt,
+					   JsonPathItem *jsp, JsonbValue *jb, bool unwrap, JsonValueList *found);
+static JsonPathExecResult recursiveExecuteUnwrapArray(JsonPathExecContext *cxt,
+							JsonPathItem *jsp, JsonbValue *jb,
+							JsonValueList *found, bool unwrapElements);
+static JsonPathExecResult recursiveExecuteNext(JsonPathExecContext *cxt,
+					 JsonPathItem *cur, JsonPathItem *next,
+					 JsonbValue *v, JsonValueList *found, bool copy);
+static JsonPathExecResult recursiveExecuteAndUnwrap(JsonPathExecContext *cxt,
+						  JsonPathItem *jsp, JsonbValue *jb, bool unwrap, JsonValueList *found);
+static JsonPathExecResult recursiveExecuteAndUnwrapNoThrow(
+								 JsonPathExecContext *cxt, JsonPathItem *jsp,
+								 JsonbValue *jb, bool unwrap, JsonValueList *found);
+static JsonPathBool recursiveExecuteBool(JsonPathExecContext *cxt,
+					 JsonPathItem *jsp, JsonbValue *jb, bool canHaveNext);
+static JsonPathBool recursiveExecuteBoolNested(JsonPathExecContext *cxt,
+						   JsonPathItem *jsp, JsonbValue *jb);
+static JsonPathExecResult recursiveAny(JsonPathExecContext *cxt,
+			 JsonPathItem *jsp, JsonbContainer *jbc, JsonValueList *found,
+			 uint32 level, uint32 first, uint32 last,
+			 bool ignoreStructuralErrors, bool unwrapNext);
+static JsonPathBool executePredicate(JsonPathExecContext *cxt,
+				 JsonPathItem *pred, JsonPathItem *larg, JsonPathItem *rarg,
+				 JsonbValue *jb, bool unwrapRightArg,
+				 JsonPathPredicateCallback exec, void *param);
+static JsonPathExecResult executeBinaryArithmExpr(JsonPathExecContext *cxt,
+						JsonPathItem *jsp, JsonbValue *jb, PGFunction func,
+						JsonValueList *found);
+static JsonPathExecResult executeUnaryArithmExpr(JsonPathExecContext *cxt,
+					   JsonPathItem *jsp, JsonbValue *jb, PGFunction func,
+					   JsonValueList *found);
+static JsonPathBool executeStartsWith(JsonPathItem *jsp,
+				  JsonbValue *whole, JsonbValue *initial, void *param);
+static JsonPathBool executeLikeRegex(JsonPathItem *jsp, JsonbValue *str,
+				 JsonbValue *rarg, void *param);
+static JsonPathExecResult executeNumericItemMethod(JsonPathExecContext *cxt,
+						 JsonPathItem *jsp, JsonbValue *jb, bool unwrap, PGFunction func,
+						 JsonValueList *found);
+static JsonPathExecResult executeKeyValueMethod(JsonPathExecContext *cxt,
+					  JsonPathItem *jsp, JsonbValue *jb, JsonValueList *found);
+static JsonPathExecResult appendBoolResult(JsonPathExecContext *cxt,
+				 JsonPathItem *jsp, JsonValueList *found, JsonPathBool res);
+static void getJsonPathItem(JsonPathExecContext *cxt, JsonPathItem *item,
+				JsonbValue *value);
+static void getJsonPathVariable(JsonPathExecContext *cxt,
+					JsonPathItem *variable, Jsonb *vars, JsonbValue *value);
+static int	JsonbArraySize(JsonbValue *jb);
+static JsonPathBool executeComparison(JsonPathItem *cmp, JsonbValue *lv,
+				  JsonbValue *rv, void *p);
+static JsonPathBool compareItems(int32 op, JsonbValue *jb1, JsonbValue *jb2);
+static int	compareNumeric(Numeric a, Numeric b);
+static JsonbValue *copyJsonbValue(JsonbValue *src);
+static JsonPathExecResult getArrayIndex(JsonPathExecContext *cxt,
+			  JsonPathItem *jsp, JsonbValue *jb, int32 *index);
+static JsonBaseObjectInfo setBaseObject(JsonPathExecContext *cxt,
+			  JsonbValue *jbv, int32 id);
+static void JsonValueListAppend(JsonValueList *jvl, JsonbValue *jbv);
+static int	JsonValueListLength(const JsonValueList *jvl);
+static bool JsonValueListIsEmpty(JsonValueList *jvl);
+static JsonbValue *JsonValueListHead(JsonValueList *jvl);
+static List *JsonValueListGetList(JsonValueList *jvl);
+static void JsonValueListInitIterator(const JsonValueList *jvl,
+						  JsonValueListIterator *it);
+static JsonbValue *JsonValueListNext(const JsonValueList *jvl,
+				  JsonValueListIterator *it);
+static int	JsonbType(JsonbValue *jb);
+static JsonbValue *JsonbInitBinary(JsonbValue *jbv, Jsonb *jb);
+static int	JsonbType(JsonbValue *jb);
+static JsonbValue *getScalar(JsonbValue *scalar, enum jbvType type);
+static JsonbValue *wrapItemsInArray(const JsonValueList *items);
+
+/****************** User interface to JsonPath executor ********************/
+
+/*
+ * jsonb_path_exists
+ *		Returns true if jsonpath returns at least one item for the specified
+ *		jsonb value.  This function and jsonb_path_match() are used to
+ *		implement @? and @@ operators, which in turn are intended to have an
+ *		index support.  Thus, it's desirable to make it easier to achieve
+ *		consistency between index scan results and sequential scan results.
+ *		So, we throw as less errors as possible.  Regarding this function,
+ *		such behavior also matches behavior of JSON_EXISTS() clause of
+ *		SQL/JSON.  Regarding jsonb_path_match(), this function doesn't have
+ *		an analogy in SQL/JSON, so we define its behavior on our own.
+ */
+Datum
+jsonb_path_exists(PG_FUNCTION_ARGS)
+{
+	Jsonb	   *jb = PG_GETARG_JSONB_P(0);
+	JsonPath   *jp = PG_GETARG_JSONPATH_P(1);
+	JsonPathExecResult res;
+	Jsonb	   *vars = NULL;
+	bool		silent = true;
+
+	if (PG_NARGS() == 4)
+	{
+		vars = PG_GETARG_JSONB_P(2);
+		silent = !PG_GETARG_BOOL(3);
+	}
+
+	res = executeJsonPath(jp, vars, jb, !silent, NULL);
+
+	PG_FREE_IF_COPY(jb, 0);
+	PG_FREE_IF_COPY(jp, 1);
+
+	if (jperIsError(res))
+		PG_RETURN_NULL();
+
+	PG_RETURN_BOOL(res == jperOk);
+}
+
+/*
+ * jsonb_path_exists_novars
+ *		Implements the 2-argument version of jsonb_path_exists
+ */
+Datum
+jsonb_path_exists_opr(PG_FUNCTION_ARGS)
+{
+	/* just call the other one -- it can handle both cases */
+	return jsonb_path_exists(fcinfo);
+}
+
+/*
+ * jsonb_path_match
+ *		Returns jsonpath predicate result item for the specified jsonb value.
+ *		See jsonb_path_exists() comment for details regarding error handling.
+ */
+Datum
+jsonb_path_match(PG_FUNCTION_ARGS)
+{
+	Jsonb	   *jb = PG_GETARG_JSONB_P(0);
+	JsonPath   *jp = PG_GETARG_JSONPATH_P(1);
+	JsonbValue *jbv;
+	JsonValueList found = {0};
+	Jsonb	   *vars = NULL;
+	bool		silent = true;
+
+	if (PG_NARGS() == 4)
+	{
+		vars = PG_GETARG_JSONB_P(2);
+		silent = !PG_GETARG_BOOL(3);
+	}
+
+	(void) executeJsonPath(jp, vars, jb, !silent, &found);
+
+	if (JsonValueListLength(&found) < 1)
+		PG_RETURN_NULL();
+
+	jbv = JsonValueListHead(&found);
+
+	PG_FREE_IF_COPY(jb, 0);
+	PG_FREE_IF_COPY(jp, 1);
+
+	if (jbv->type != jbvBool)
+		PG_RETURN_NULL();
+
+	PG_RETURN_BOOL(jbv->val.boolean);
+}
+
+/*
+ * jsonb_path_match_novars
+ *		Implements the 2-argument version of jsonb_path_match
+ */
+Datum
+jsonb_path_match_opr(PG_FUNCTION_ARGS)
+{
+	/* just call the other one -- it can handle both cases */
+	return jsonb_path_match(fcinfo);
+}
+
+/*
+ * jsonb_path_query
+ *		Executes jsonpath for given jsonb document and returns result as
+ *		rowset.
+ */
+Datum
+jsonb_path_query(PG_FUNCTION_ARGS)
+{
+	FuncCallContext *funcctx;
+	List	   *found;
+	JsonbValue *v;
+	ListCell   *c;
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		JsonPath   *jp;
+		Jsonb	   *jb;
+		MemoryContext oldcontext;
+		Jsonb	   *vars;
+		bool		silent;
+		JsonValueList found = {0};
+
+		funcctx = SRF_FIRSTCALL_INIT();
+		oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
+
+		jb = PG_GETARG_JSONB_P_COPY(0);
+		jp = PG_GETARG_JSONPATH_P_COPY(1);
+		vars = PG_GETARG_JSONB_P_COPY(2);
+		silent = PG_GETARG_BOOL(3);
+
+		(void) executeJsonPath(jp, vars, jb, !silent, &found);
+
+		funcctx->user_fctx = JsonValueListGetList(&found);
+
+		MemoryContextSwitchTo(oldcontext);
+	}
+
+	funcctx = SRF_PERCALL_SETUP();
+	found = funcctx->user_fctx;
+
+	c = list_head(found);
+
+	if (c == NULL)
+		SRF_RETURN_DONE(funcctx);
+
+	v = lfirst(c);
+	funcctx->user_fctx = list_delete_first(found);
+
+	SRF_RETURN_NEXT(funcctx, JsonbPGetDatum(JsonbValueToJsonb(v)));
+}
+
+/*
+ * jsonb_path_query_array
+ *		Executes jsonpath for given jsonb document and returns result as
+ *		jsonb array.
+ */
+Datum
+jsonb_path_query_array(FunctionCallInfo fcinfo)
+{
+	Jsonb	   *jb = PG_GETARG_JSONB_P(0);
+	JsonPath   *jp = PG_GETARG_JSONPATH_P(1);
+	JsonValueList found = {0};
+	Jsonb	   *vars = PG_GETARG_JSONB_P(2);
+	bool		silent = PG_GETARG_BOOL(3);
+
+	(void) executeJsonPath(jp, vars, jb, !silent, &found);
+
+	PG_RETURN_JSONB_P(JsonbValueToJsonb(wrapItemsInArray(&found)));
+}
+
+/*
+ * jsonb_path_query_first
+ *		Executes jsonpath for given jsonb document and returns first result
+ *		item.  If there are no items, NULL returned.
+ */
+Datum
+jsonb_path_query_first(FunctionCallInfo fcinfo)
+{
+	Jsonb	   *jb = PG_GETARG_JSONB_P(0);
+	JsonPath   *jp = PG_GETARG_JSONPATH_P(1);
+	JsonValueList found = {0};
+	Jsonb	   *vars = PG_GETARG_JSONB_P(2);
+	bool		silent = PG_GETARG_BOOL(3);
+
+	(void) executeJsonPath(jp, vars, jb, !silent, &found);
+
+	if (JsonValueListLength(&found) >= 1)
+		PG_RETURN_JSONB_P(JsonbValueToJsonb(JsonValueListHead(&found)));
+	else
+		PG_RETURN_NULL();
+}
+
+/********************Execute functions for JsonPath**************************/
+
+/*
+ * Interface to jsonpath executor
+ *
+ * 'path' - jsonpath to be executed
+ * 'vars' - variables to be substituted to jsonpath
+ * 'json' - target document for jsonpath evaluation
+ * 'throwErrors' - whether we should throw suppressible errors
+ * 'result' - list to store result items into
+ *
+ * Returns an error happens during processing or NULL on no error.
+ *
+ * Note, jsonb and jsonpath values should be avaliable and untoasted during
+ * work because JsonPathItem, JsonbValue and result item could have pointers
+ * into input values.  If caller needs to just check if document matches
+ * jsonpath, then it doesn't provide a result arg.  In this case executor
+ * works till first positive result and does not check the rest if possible.
+ * In other case it tries to find all the satisfied result items.
+ */
+static JsonPathExecResult
+executeJsonPath(JsonPath *path, Jsonb *vars, Jsonb *json, bool throwErrors,
+				JsonValueList *result)
+{
+	JsonPathExecContext cxt;
+	JsonPathExecResult res;
+	JsonPathItem jsp;
+	JsonbValue	jbv;
+
+	jspInit(&jsp, path);
+
+	if (!JsonbExtractScalar(&json->root, &jbv))
+		JsonbInitBinary(&jbv, json);
+
+	if (vars && !JsonContainerIsObject(&vars->root))
+	{
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+				 errmsg("jsonb containing jsonpath variables "
+						"is not an object")));
+	}
+
+	cxt.vars = vars;
+	cxt.laxMode = (path->header & JSONPATH_LAX) != 0;
+	cxt.ignoreStructuralErrors = cxt.laxMode;
+	cxt.root = &jbv;
+	cxt.current = &jbv;
+	cxt.baseObject.jbc = NULL;
+	cxt.baseObject.id = 0;
+	cxt.lastGeneratedObjectId = vars ? 2 : 1;
+	cxt.innermostArraySize = -1;
+	cxt.throwErrors = throwErrors;
+
+	if (jspStrictAbsenseOfErrors(&cxt) && !result)
+	{
+		/*
+		 * In strict mode we must get a complete list of values to check that
+		 * there are no errors at all.
+		 */
+		JsonValueList vals = {0};
+
+		Assert(!throwErrors);
+
+		res = recursiveExecute(&cxt, &jsp, &jbv, &vals);
+
+		if (jperIsError(res))
+			return res;
+
+		return JsonValueListIsEmpty(&vals) ? jperNotFound : jperOk;
+	}
+
+	res = recursiveExecute(&cxt, &jsp, &jbv, result);
+
+	Assert(!throwErrors || !jperIsError(res));
+
+	return res;
+}
+
+/*
+ * Execute jsonpath with automatic unwrapping of current item in lax mode.
+ */
+static JsonPathExecResult
+recursiveExecute(JsonPathExecContext *cxt, JsonPathItem *jsp,
+				 JsonbValue *jb, JsonValueList *found)
+{
+	return recursiveExecuteUnwrap(cxt, jsp, jb, jspAutoUnwrap(cxt), found);
+}
+
+/*
+ * Main jsonpath executor function: walks on jsonpath structure, finds
+ * relevant parts of jsonb and evaluates expressions over them.
+ * When 'unwrap' is true current SQL/JSON item is unwrapped if it is an array.
+ */
+static JsonPathExecResult
+recursiveExecuteUnwrap(JsonPathExecContext *cxt, JsonPathItem *jsp,
+					   JsonbValue *jb, bool unwrap, JsonValueList *found)
+{
+	JsonPathItem elem;
+	JsonPathExecResult res = jperNotFound;
+	JsonBaseObjectInfo baseObject;
+
+	check_stack_depth();
+	CHECK_FOR_INTERRUPTS();
+
+	switch (jsp->type)
+	{
+			/* all boolean item types: */
+		case jpiAnd:
+		case jpiOr:
+		case jpiNot:
+		case jpiIsUnknown:
+		case jpiEqual:
+		case jpiNotEqual:
+		case jpiLess:
+		case jpiGreater:
+		case jpiLessOrEqual:
+		case jpiGreaterOrEqual:
+		case jpiExists:
+		case jpiStartsWith:
+		case jpiLikeRegex:
+			{
+				JsonPathBool st = recursiveExecuteBool(cxt, jsp, jb, true);
+
+				res = appendBoolResult(cxt, jsp, found, st);
+				break;
+			}
+
+		case jpiKey:
+			if (JsonbType(jb) == jbvObject)
+			{
+				JsonbValue *v;
+				JsonbValue	key;
+
+				key.type = jbvString;
+				key.val.string.val = jspGetString(jsp, &key.val.string.len);
+
+				v = findJsonbValueFromContainer(jb->val.binary.data,
+												JB_FOBJECT, &key);
+
+				if (v != NULL)
+				{
+					res = recursiveExecuteNext(cxt, jsp, NULL,
+											   v, found, false);
+
+					/* free value if it was not added to found list */
+					if (jspHasNext(jsp) || !found)
+						pfree(v);
+				}
+				else if (!jspIgnoreStructuralErrors(cxt))
+				{
+					StringInfoData keybuf;
+					char	   *keystr;
+
+					Assert(found);
+
+					if (!jspThrowErrors(cxt))
+						return jperError;
+
+					initStringInfo(&keybuf);
+
+					keystr = pnstrdup(key.val.string.val, key.val.string.len);
+					escape_json(&keybuf, keystr);
+
+					ereport(ERROR,
+							(errcode(ERRCODE_JSON_MEMBER_NOT_FOUND), \
+							 errmsg(ERRMSG_JSON_MEMBER_NOT_FOUND),
+							 errdetail("JSON object does not contain key %s",
+									   keybuf.data)));
+				}
+			}
+			else if (unwrap && JsonbType(jb) == jbvArray)
+				return recursiveExecuteUnwrapArray(cxt, jsp, jb, found, false);
+			else if (!jspIgnoreStructuralErrors(cxt))
+			{
+				Assert(found);
+				RETURN_ERROR(ereport(ERROR,
+									 (errcode(ERRCODE_JSON_MEMBER_NOT_FOUND),
+									  errmsg(ERRMSG_JSON_MEMBER_NOT_FOUND),
+									  errdetail("jsonpath member accessor is applied to "
+												"not an object"))));
+			}
+			break;
+
+		case jpiRoot:
+			jb = cxt->root;
+			baseObject = setBaseObject(cxt, jb, 0);
+			res = recursiveExecuteNext(cxt, jsp, NULL, jb, found, true);
+			cxt->baseObject = baseObject;
+			break;
+
+		case jpiCurrent:
+			res = recursiveExecuteNext(cxt, jsp, NULL, cxt->current,
+									   found, true);
+			break;
+
+		case jpiAnyArray:
+			if (JsonbType(jb) == jbvArray)
+			{
+				bool		hasNext = jspGetNext(jsp, &elem);
+
+				res = recursiveExecuteUnwrapArray(cxt, hasNext ? &elem : NULL,
+												  jb, found, jspAutoUnwrap(cxt));
+			}
+			else if (jspAutoWrap(cxt))
+				res = recursiveExecuteNext(cxt, jsp, NULL, jb, found, true);
+			else if (!jspIgnoreStructuralErrors(cxt))
+				RETURN_ERROR(ereport(ERROR,
+									 (errcode(ERRCODE_JSON_ARRAY_NOT_FOUND),
+									  errmsg(ERRMSG_JSON_ARRAY_NOT_FOUND),
+									  errdetail("jsonpath wildcard array accessor is "
+												"applied to not an array"))));
+			break;
+
+		case jpiIndexArray:
+			if (JsonbType(jb) == jbvArray || jspAutoWrap(cxt))
+			{
+				int			innermostArraySize = cxt->innermostArraySize;
+				int			i;
+				int			size = JsonbArraySize(jb);
+				bool		singleton = size < 0;
+				bool		hasNext = jspGetNext(jsp, &elem);
+
+				if (singleton)
+					size = 1;
+
+				cxt->innermostArraySize = size; /* for LAST evaluation */
+
+				for (i = 0; i < jsp->content.array.nelems; i++)
+				{
+					JsonPathItem from;
+					JsonPathItem to;
+					int32		index;
+					int32		index_from;
+					int32		index_to;
+					bool		range = jspGetArraySubscript(jsp, &from,
+															 &to, i);
+
+					res = getArrayIndex(cxt, &from, jb, &index_from);
+
+					if (jperIsError(res))
+						break;
+
+					if (range)
+					{
+						res = getArrayIndex(cxt, &to, jb, &index_to);
+
+						if (jperIsError(res))
+							break;
+					}
+					else
+						index_to = index_from;
+
+					if (!jspIgnoreStructuralErrors(cxt) &&
+						(index_from < 0 ||
+						 index_from > index_to ||
+						 index_to >= size))
+						RETURN_ERROR(ereport(ERROR,
+											 (errcode(ERRCODE_INVALID_JSON_SUBSCRIPT),
+											  errmsg(ERRMSG_INVALID_JSON_SUBSCRIPT),
+											  errdetail("jsonpath array subscript is "
+														"out of bounds"))));
+
+					if (index_from < 0)
+						index_from = 0;
+
+					if (index_to >= size)
+						index_to = size - 1;
+
+					res = jperNotFound;
+
+					for (index = index_from; index <= index_to; index++)
+					{
+						JsonbValue *v;
+						bool		copy;
+
+						if (singleton)
+						{
+							v = jb;
+							copy = true;
+						}
+						else
+						{
+							v = getIthJsonbValueFromContainer(jb->val.binary.data,
+															  (uint32) index);
+
+							if (v == NULL)
+								continue;
+
+							copy = false;
+						}
+
+						if (!hasNext && !found)
+							return jperOk;
+
+						res = recursiveExecuteNext(cxt, jsp, &elem, v, found,
+												   copy);
+
+						if (jperIsError(res))
+							break;
+
+						if (res == jperOk && !found)
+							break;
+					}
+
+					if (jperIsError(res))
+						break;
+
+					if (res == jperOk && !found)
+						break;
+				}
+
+				cxt->innermostArraySize = innermostArraySize;
+			}
+			else if (!jspIgnoreStructuralErrors(cxt))
+			{
+				RETURN_ERROR(ereport(ERROR,
+									 (errcode(ERRCODE_JSON_ARRAY_NOT_FOUND),
+									  errmsg(ERRMSG_JSON_ARRAY_NOT_FOUND),
+									  errdetail("jsonpath array accessor is applied to "
+												"not an array"))));
+			}
+			break;
+
+		case jpiLast:
+			{
+				JsonbValue	tmpjbv;
+				JsonbValue *lastjbv;
+				int			last;
+				bool		hasNext = jspGetNext(jsp, &elem);
+
+				if (cxt->innermostArraySize < 0)
+					elog(ERROR, "evaluating jsonpath LAST outside of "
+						 "array subscript");
+
+				if (!hasNext && !found)
+				{
+					res = jperOk;
+					break;
+				}
+
+				last = cxt->innermostArraySize - 1;
+
+				lastjbv = hasNext ? &tmpjbv : palloc(sizeof(*lastjbv));
+
+				lastjbv->type = jbvNumeric;
+				lastjbv->val.numeric =
+					DatumGetNumeric(DirectFunctionCall1(int4_numeric,
+														Int32GetDatum(last)));
+
+				res = recursiveExecuteNext(cxt, jsp, &elem,
+										   lastjbv, found, hasNext);
+			}
+			break;
+
+		case jpiAnyKey:
+			if (JsonbType(jb) == jbvObject)
+			{
+				bool		hasNext = jspGetNext(jsp, &elem);
+
+				if (jb->type != jbvBinary)
+					elog(ERROR, "invalid jsonb object type: %d", jb->type);
+
+				return recursiveAny(cxt, hasNext ? &elem : NULL,
+									jb->val.binary.data, found, 1, 1, 1,
+									false, jspAutoUnwrap(cxt));
+			}
+			else if (unwrap && JsonbType(jb) == jbvArray)
+				return recursiveExecuteUnwrapArray(cxt, jsp, jb, found, false);
+			else if (!jspIgnoreStructuralErrors(cxt))
+			{
+				Assert(found);
+				RETURN_ERROR(ereport(ERROR,
+									 (errcode(ERRCODE_JSON_OBJECT_NOT_FOUND),
+									  errmsg(ERRMSG_JSON_OBJECT_NOT_FOUND),
+									  errdetail("jsonpath wildcard member accessor is "
+												"applied to not an object"))));
+			}
+			break;
+
+		case jpiAdd:
+			return executeBinaryArithmExpr(cxt, jsp, jb,
+										   numeric_add, found);
+
+		case jpiSub:
+			return executeBinaryArithmExpr(cxt, jsp, jb,
+										   numeric_sub, found);
+
+		case jpiMul:
+			return executeBinaryArithmExpr(cxt, jsp, jb,
+										   numeric_mul, found);
+
+		case jpiDiv:
+			return executeBinaryArithmExpr(cxt, jsp, jb,
+										   numeric_div, found);
+
+		case jpiMod:
+			return executeBinaryArithmExpr(cxt, jsp, jb,
+										   numeric_mod, found);
+
+		case jpiPlus:
+			return executeUnaryArithmExpr(cxt, jsp, jb, NULL, found);
+
+		case jpiMinus:
+			return executeUnaryArithmExpr(cxt, jsp, jb, numeric_uminus,
+										  found);
+
+		case jpiFilter:
+			{
+				JsonPathBool st;
+
+				if (unwrap && JsonbType(jb) == jbvArray)
+					return recursiveExecuteUnwrapArray(cxt, jsp, jb, found,
+													   false);
+
+				jspGetArg(jsp, &elem);
+				st = recursiveExecuteBoolNested(cxt, &elem, jb);
+				if (st != jpbTrue)
+					res = jperNotFound;
+				else
+					res = recursiveExecuteNext(cxt, jsp, NULL,
+											   jb, found, true);
+				break;
+			}
+
+		case jpiAny:
+			{
+				bool		hasNext = jspGetNext(jsp, &elem);
+
+				/* first try without any intermediate steps */
+				if (jsp->content.anybounds.first == 0)
+				{
+					bool		savedIgnoreStructuralErrors;
+
+					savedIgnoreStructuralErrors = cxt->ignoreStructuralErrors;
+					cxt->ignoreStructuralErrors = true;
+					res = recursiveExecuteNext(cxt, jsp, &elem,
+											   jb, found, true);
+					cxt->ignoreStructuralErrors = savedIgnoreStructuralErrors;
+
+					if (res == jperOk && !found)
+						break;
+				}
+
+				if (jb->type == jbvBinary)
+					res = recursiveAny(cxt, hasNext ? &elem : NULL,
+									   jb->val.binary.data, found,
+									   1,
+									   jsp->content.anybounds.first,
+									   jsp->content.anybounds.last,
+									   true, jspAutoUnwrap(cxt));
+				break;
+			}
+
+		case jpiNull:
+		case jpiBool:
+		case jpiNumeric:
+		case jpiString:
+		case jpiVariable:
+			{
+				JsonbValue	vbuf;
+				JsonbValue *v;
+				bool		hasNext = jspGetNext(jsp, &elem);
+
+				if (!hasNext && !found)
+				{
+					res = jperOk;	/* skip evaluation */
+					break;
+				}
+
+				v = hasNext ? &vbuf : palloc(sizeof(*v));
+
+				baseObject = cxt->baseObject;
+				getJsonPathItem(cxt, jsp, v);
+
+				res = recursiveExecuteNext(cxt, jsp, &elem,
+										   v, found, hasNext);
+				cxt->baseObject = baseObject;
+			}
+			break;
+
+		case jpiType:
+			{
+				JsonbValue *jbv = palloc(sizeof(*jbv));
+
+				jbv->type = jbvString;
+				jbv->val.string.val = pstrdup(JsonbTypeName(jb));
+				jbv->val.string.len = strlen(jbv->val.string.val);
+
+				res = recursiveExecuteNext(cxt, jsp, NULL, jbv,
+										   found, false);
+			}
+			break;
+
+		case jpiSize:
+			{
+				int			size = JsonbArraySize(jb);
+
+				if (size < 0)
+				{
+					if (!jspAutoWrap(cxt))
+					{
+						if (!jspIgnoreStructuralErrors(cxt))
+							RETURN_ERROR(ereport(ERROR,
+												 (errcode(ERRCODE_JSON_ARRAY_NOT_FOUND),
+												  errmsg(ERRMSG_JSON_ARRAY_NOT_FOUND),
+												  errdetail("jsonpath item method .%s() "
+															"is applied to not an array",
+															jspOperationName(jsp->type)))));
+						break;
+					}
+
+					size = 1;
+				}
+
+				jb = palloc(sizeof(*jb));
+
+				jb->type = jbvNumeric;
+				jb->val.numeric =
+					DatumGetNumeric(DirectFunctionCall1(int4_numeric,
+														Int32GetDatum(size)));
+
+				res = recursiveExecuteNext(cxt, jsp, NULL, jb, found, false);
+			}
+			break;
+
+		case jpiAbs:
+			return executeNumericItemMethod(cxt, jsp, jb, unwrap, numeric_abs,
+											found);
+
+		case jpiFloor:
+			return executeNumericItemMethod(cxt, jsp, jb, unwrap, numeric_floor,
+											found);
+
+		case jpiCeiling:
+			return executeNumericItemMethod(cxt, jsp, jb, unwrap, numeric_ceil,
+											found);
+
+		case jpiDouble:
+			{
+				JsonbValue	jbv;
+
+				if (unwrap && JsonbType(jb) == jbvArray)
+					return recursiveExecuteUnwrapArray(cxt, jsp, jb, found,
+													   false);
+
+				if (jb->type == jbvNumeric)
+				{
+					char	   *tmp = DatumGetCString(DirectFunctionCall1(numeric_out,
+																		  NumericGetDatum(jb->val.numeric)));
+
+					(void) float8in_internal(tmp,
+											 NULL,
+											 "double precision",
+											 tmp);
+
+					res = jperOk;
+				}
+				else if (jb->type == jbvString)
+				{
+					/* cast string as double */
+					double		val;
+					char	   *tmp = pnstrdup(jb->val.string.val,
+											   jb->val.string.len);
+
+					val = float8in_internal(tmp,
+											NULL,
+											"double precision",
+											tmp);
+
+					if (isinf(val))
+						RETURN_ERROR(ereport(ERROR,
+											 (errcode(ERRCODE_NON_NUMERIC_JSON_ITEM),
+											  errmsg(ERRMSG_NON_NUMERIC_JSON_ITEM),
+											  errdetail("jsonpath item method .%s() is "
+														"applied to not a numeric value",
+														jspOperationName(jsp->type)))));
+
+					jb = &jbv;
+					jb->type = jbvNumeric;
+					jb->val.numeric = DatumGetNumeric(DirectFunctionCall1(float8_numeric,
+																		  Float8GetDatum(val)));
+					res = jperOk;
+				}
+
+				if (res == jperNotFound)
+					RETURN_ERROR(ereport(ERROR,
+										 (errcode(ERRCODE_NON_NUMERIC_JSON_ITEM),
+										  errmsg(ERRMSG_NON_NUMERIC_JSON_ITEM),
+										  errdetail("jsonpath item method .%s() is "
+													"applied to neither a string nor "
+													"numeric value",
+													jspOperationName(jsp->type)))));
+
+				res = recursiveExecuteNext(cxt, jsp, NULL, jb, found, true);
+			}
+			break;
+
+		case jpiKeyValue:
+			if (unwrap && JsonbType(jb) == jbvArray)
+				return recursiveExecuteUnwrapArray(cxt, jsp, jb, found, false);
+
+			return executeKeyValueMethod(cxt, jsp, jb, found);
+
+		default:
+			elog(ERROR, "unrecognized jsonpath item type: %d", jsp->type);
+	}
+
+	return res;
+}
+
+/*
+ * Unwrap current array item and execute jsonpath for each of its elements.
+ */
+static JsonPathExecResult
+recursiveExecuteUnwrapArray(JsonPathExecContext *cxt, JsonPathItem *jsp,
+							JsonbValue *jb, JsonValueList *found,
+							bool unwrapElements)
+{
+	if (jb->type != jbvBinary)
+	{
+		Assert(jb->type != jbvArray);
+		elog(ERROR, "invalid jsonb array value type: %d", jb->type);
+	}
+
+	return recursiveAny(cxt, jsp, jb->val.binary.data, found, 1, 1, 1,
+						false, unwrapElements);
+}
+
+/*
+ * Execute next jsonpath item if exists.
+ */
+static JsonPathExecResult
+recursiveExecuteNext(JsonPathExecContext *cxt,
+					 JsonPathItem *cur, JsonPathItem *next,
+					 JsonbValue *v, JsonValueList *found, bool copy)
+{
+	JsonPathItem elem;
+	bool		hasNext;
+
+	if (!cur)
+		hasNext = next != NULL;
+	else if (next)
+		hasNext = jspHasNext(cur);
+	else
+	{
+		next = &elem;
+		hasNext = jspGetNext(cur, next);
+	}
+
+	if (hasNext)
+		return recursiveExecute(cxt, next, v, found);
+
+	if (found)
+		JsonValueListAppend(found, copy ? copyJsonbValue(v) : v);
+
+	return jperOk;
+}
+
+/*
+ * Execute jsonpath expression and automatically unwrap each array item from
+ * the resulting sequence in lax mode.
+ */
+static JsonPathExecResult
+recursiveExecuteAndUnwrap(JsonPathExecContext *cxt, JsonPathItem *jsp,
+						  JsonbValue *jb, bool unwrap, JsonValueList *found)
+{
+	if (unwrap && jspAutoUnwrap(cxt))
+	{
+		JsonValueList seq = {0};
+		JsonValueListIterator it;
+		JsonPathExecResult res = recursiveExecute(cxt, jsp, jb, &seq);
+		JsonbValue *item;
+
+		if (jperIsError(res))
+			return res;
+
+		JsonValueListInitIterator(&seq, &it);
+		while ((item = JsonValueListNext(&seq, &it)))
+		{
+			Assert(item->type != jbvArray);
+
+			if (JsonbType(item) == jbvArray)
+				recursiveExecuteUnwrapArray(cxt, NULL, item, found, false);
+			else
+				JsonValueListAppend(found, item);
+		}
+
+		return jperOk;
+	}
+
+	return recursiveExecute(cxt, jsp, jb, found);
+}
+
+static JsonPathExecResult
+recursiveExecuteAndUnwrapNoThrow(JsonPathExecContext *cxt, JsonPathItem *jsp,
+								 JsonbValue *jb, bool unwrap,
+								 JsonValueList *found)
+{
+	JsonPathExecResult res;
+	bool		throwErrors = cxt->throwErrors;
+
+	cxt->throwErrors = false;
+	res = recursiveExecuteAndUnwrap(cxt, jsp, jb, unwrap, found);
+	cxt->throwErrors = throwErrors;
+
+	return res;
+}
+
+/* Execute boolean-valued jsonpath expression. */
+static JsonPathBool
+recursiveExecuteBool(JsonPathExecContext *cxt, JsonPathItem *jsp,
+					 JsonbValue *jb, bool canHaveNext)
+{
+	JsonPathItem larg;
+	JsonPathItem rarg;
+	JsonPathBool res;
+	JsonPathBool res2;
+
+	if (!canHaveNext && jspHasNext(jsp))
+		elog(ERROR, "boolean jsonpath item cannot have next item");
+
+	switch (jsp->type)
+	{
+		case jpiAnd:
+			jspGetLeftArg(jsp, &larg);
+			res = recursiveExecuteBool(cxt, &larg, jb, false);
+
+			if (res == jpbFalse)
+				return jpbFalse;
+
+			/*
+			 * SQL/JSON says that we should check second arg in case of
+			 * jperError
+			 */
+
+			jspGetRightArg(jsp, &rarg);
+			res2 = recursiveExecuteBool(cxt, &rarg, jb, false);
+
+			return res2 == jpbTrue ? res : res2;
+
+		case jpiOr:
+			jspGetLeftArg(jsp, &larg);
+			res = recursiveExecuteBool(cxt, &larg, jb, false);
+
+			if (res == jpbTrue)
+				return jpbTrue;
+
+			jspGetRightArg(jsp, &rarg);
+			res2 = recursiveExecuteBool(cxt, &rarg, jb, false);
+
+			return res2 == jpbFalse ? res : res2;
+
+		case jpiNot:
+			jspGetArg(jsp, &larg);
+
+			res = recursiveExecuteBool(cxt, &larg, jb, false);
+
+			if (res == jpbUnknown)
+				return jpbUnknown;
+
+			return res == jpbTrue ? jpbFalse : jpbTrue;
+
+		case jpiIsUnknown:
+			jspGetArg(jsp, &larg);
+			res = recursiveExecuteBool(cxt, &larg, jb, false);
+			return res == jpbUnknown ? jpbTrue : jpbFalse;
+
+		case jpiEqual:
+		case jpiNotEqual:
+		case jpiLess:
+		case jpiGreater:
+		case jpiLessOrEqual:
+		case jpiGreaterOrEqual:
+			jspGetLeftArg(jsp, &larg);
+			jspGetRightArg(jsp, &rarg);
+			return executePredicate(cxt, jsp, &larg, &rarg, jb, true,
+									executeComparison, NULL);
+
+		case jpiStartsWith:		/* 'whole STARTS WITH initial' */
+			jspGetLeftArg(jsp, &larg);	/* 'whole' */
+			jspGetRightArg(jsp, &rarg); /* 'initial' */
+			return executePredicate(cxt, jsp, &larg, &rarg, jb, false,
+									executeStartsWith, NULL);
+
+		case jpiLikeRegex:		/* 'expr LIKE_REGEX pattern FLAGS flags' */
+			{
+				/*
+				 * 'expr' is a sequence-returning expression.  'pattern' is a
+				 * regex string literal.  SQL/JSON standard requires XQuery
+				 * regexes, but we use Postgres regexes here.  'flags' is a
+				 * string literal converted to integer flags at compile-time.
+				 */
+				JsonLikeRegexContext lrcxt = {0};
+
+				jspInitByBuffer(&larg, jsp->base,
+								jsp->content.like_regex.expr);
+
+				return executePredicate(cxt, jsp, &larg, NULL, jb, false,
+										executeLikeRegex, &lrcxt);
+			}
+
+		case jpiExists:
+			jspGetArg(jsp, &larg);
+
+			if (jspStrictAbsenseOfErrors(cxt))
+			{
+				/*
+				 * In strict mode we must get a complete list of values to
+				 * check that there are no errors at all.
+				 */
+				JsonValueList vals = {0};
+				JsonPathExecResult res =
+				recursiveExecuteAndUnwrapNoThrow(cxt, &larg, jb, false, &vals);
+
+				if (jperIsError(res))
+					return jpbUnknown;
+
+				return JsonValueListIsEmpty(&vals) ? jpbFalse : jpbTrue;
+			}
+			else
+			{
+				JsonPathExecResult res =
+				recursiveExecuteAndUnwrapNoThrow(cxt, &larg, jb, false, NULL);
+
+				if (jperIsError(res))
+					return jpbUnknown;
+
+				return res == jperOk ? jpbTrue : jpbFalse;
+			}
+
+		default:
+			elog(ERROR, "invalid boolean jsonpath item type: %d", jsp->type);
+			return jpbUnknown;
+	}
+}
+
+/*
+ * Execute nested (filters etc.) boolean expression pushing current SQL/JSON
+ * item onto the stack.
+ */
+static JsonPathBool
+recursiveExecuteBoolNested(JsonPathExecContext *cxt, JsonPathItem *jsp,
+						   JsonbValue *jb)
+{
+	JsonbValue *prev;
+	JsonPathBool res;
+
+	prev = cxt->current;
+	cxt->current = jb;
+	res = recursiveExecuteBool(cxt, jsp, jb, false);
+	cxt->current = prev;
+
+	return res;
+}
+
+/*
+ * Implementation of several jsonpath nodes:
+ *  - jpiAny (.** accessor),
+ *  - jpiAnyKey (.* accessor),
+ *  - jpiAnyArray ([*] accessor)
+ */
+static JsonPathExecResult
+recursiveAny(JsonPathExecContext *cxt, JsonPathItem *jsp, JsonbContainer *jbc,
+			 JsonValueList *found, uint32 level, uint32 first, uint32 last,
+			 bool ignoreStructuralErrors, bool unwrapNext)
+{
+	JsonPathExecResult res = jperNotFound;
+	JsonbIterator *it;
+	int32		r;
+	JsonbValue	v;
+
+	check_stack_depth();
+
+	if (level > last)
+		return res;
+
+	it = JsonbIteratorInit(jbc);
+
+	/*
+	 * Recursively iterate over jsonb objects/arrays
+	 */
+	while ((r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
+	{
+		if (r == WJB_KEY)
+		{
+			r = JsonbIteratorNext(&it, &v, true);
+			Assert(r == WJB_VALUE);
+		}
+
+		if (r == WJB_VALUE || r == WJB_ELEM)
+		{
+
+			if (level >= first ||
+				(first == PG_UINT32_MAX && last == PG_UINT32_MAX &&
+				 v.type != jbvBinary))	/* leaves only requested */
+			{
+				/* check expression */
+				if (jsp)
+				{
+					if (ignoreStructuralErrors)
+					{
+						bool		savedIgnoreStructuralErrors;
+
+						savedIgnoreStructuralErrors = cxt->ignoreStructuralErrors;
+						cxt->ignoreStructuralErrors = true;
+						res = recursiveExecuteUnwrap(cxt, jsp, &v, unwrapNext, found);
+						cxt->ignoreStructuralErrors = savedIgnoreStructuralErrors;
+					}
+					else
+						res = recursiveExecuteUnwrap(cxt, jsp, &v, unwrapNext, found);
+
+					if (jperIsError(res))
+						break;
+
+					if (res == jperOk && !found)
+						break;
+				}
+				else if (found)
+					JsonValueListAppend(found, copyJsonbValue(&v));
+				else
+					return jperOk;
+			}
+
+			if (level < last && v.type == jbvBinary)
+			{
+				res = recursiveAny(cxt, jsp, v.val.binary.data, found,
+								   level + 1, first, last,
+								   ignoreStructuralErrors, unwrapNext);
+
+				if (jperIsError(res))
+					break;
+
+				if (res == jperOk && found == NULL)
+					break;
+			}
+		}
+	}
+
+	return res;
+}
+
+/*
+ * Execute unary or binary predicate.
+ *
+ * Predicates have existence semantics, because their operands are item
+ * sequences.  Pairs of items from the left and right operand's sequences are
+ * checked.  TRUE returned only if any pair satisfying the condition is found.
+ * In strict mode, even if the desired pair has already been found, all pairs
+ * still need to be examined to check the absence of errors.  If any error
+ * occurs, UNKNOWN (analogous to SQL NULL) is returned.
+ */
+static JsonPathBool
+executePredicate(JsonPathExecContext *cxt, JsonPathItem *pred,
+				 JsonPathItem *larg, JsonPathItem *rarg, JsonbValue *jb,
+				 bool unwrapRightArg, JsonPathPredicateCallback exec,
+				 void *param)
+{
+	JsonPathExecResult res;
+	JsonValueListIterator lseqit;
+	JsonValueList lseq = {0};
+	JsonValueList rseq = {0};
+	JsonbValue *lval;
+	bool		error = false;
+	bool		found = false;
+
+	/* Left argument is always auto-unwrapped. */
+	res = recursiveExecuteAndUnwrapNoThrow(cxt, larg, jb, true, &lseq);
+	if (jperIsError(res))
+		return jpbUnknown;
+
+	if (rarg)
+	{
+		/* Right argument is conditionally auto-unwrapped. */
+		res = recursiveExecuteAndUnwrapNoThrow(cxt, rarg, jb, unwrapRightArg,
+											   &rseq);
+		if (jperIsError(res))
+			return jpbUnknown;
+	}
+
+	JsonValueListInitIterator(&lseq, &lseqit);
+	while ((lval = JsonValueListNext(&lseq, &lseqit)))
+	{
+		JsonValueListIterator rseqit;
+		JsonbValue *rval;
+		bool		first = true;
+
+		if (rarg)
+		{
+			JsonValueListInitIterator(&rseq, &rseqit);
+			rval = JsonValueListNext(&rseq, &rseqit);
+		}
+		else
+		{
+			rval = NULL;
+		}
+
+		/* Loop over right arg sequence or do single pass otherwise */
+		while (rarg ? (rval != NULL) : first)
+		{
+			JsonPathBool res = exec(pred, lval, rval, param);
+
+			if (res == jpbUnknown)
+			{
+				if (jspStrictAbsenseOfErrors(cxt))
+					return jpbUnknown;
+
+				error = true;
+			}
+			else if (res == jpbTrue)
+			{
+				if (!jspStrictAbsenseOfErrors(cxt))
+					return jpbTrue;
+
+				found = true;
+			}
+
+			first = false;
+			if (rarg)
+				rval = JsonValueListNext(&rseq, &rseqit);
+		}
+	}
+
+	if (found)					/* possible only in strict mode */
+		return jpbTrue;
+
+	if (error)					/* possible only in lax mode */
+		return jpbUnknown;
+
+	return jpbFalse;
+}
+
+/*
+ * Execute binary arithmetic expression on singleton numeric operands.
+ * Array operands are automatically unwrapped in lax mode.
+ */
+static JsonPathExecResult
+executeBinaryArithmExpr(JsonPathExecContext *cxt, JsonPathItem *jsp,
+						JsonbValue *jb, PGFunction func,
+						JsonValueList *found)
+{
+	JsonPathExecResult jper;
+	JsonPathItem elem;
+	JsonValueList lseq = {0};
+	JsonValueList rseq = {0};
+	JsonbValue *lval;
+	JsonbValue *rval;
+	Datum		res;
+
+	jspGetLeftArg(jsp, &elem);
+
+	/*
+	 * XXX: By standard only operands of multiplicative expressions are
+	 * unwrapped.  We extend it to other binary arithmetics expressions too.
+	 */
+	jper = recursiveExecuteAndUnwrap(cxt, &elem, jb, true, &lseq);
+	if (jperIsError(jper))
+		return jper;
+
+	jspGetRightArg(jsp, &elem);
+
+	jper = recursiveExecuteAndUnwrap(cxt, &elem, jb, true, &rseq);
+	if (jperIsError(jper))
+		return jper;
+
+	if (JsonValueListLength(&lseq) != 1 ||
+		!(lval = getScalar(JsonValueListHead(&lseq), jbvNumeric)))
+		RETURN_ERROR(ereport(ERROR,
+							 (errcode(ERRCODE_SINGLETON_JSON_ITEM_REQUIRED),
+							  errmsg(ERRMSG_SINGLETON_JSON_ITEM_REQUIRED),
+							  errdetail("left operand of binary jsonpath operator %s "
+										"is not a singleton numeric value",
+										jspOperationName(jsp->type)))));
+
+	if (JsonValueListLength(&rseq) != 1 ||
+		!(rval = getScalar(JsonValueListHead(&rseq), jbvNumeric)))
+		RETURN_ERROR(ereport(ERROR,
+							 (errcode(ERRCODE_SINGLETON_JSON_ITEM_REQUIRED),
+							  errmsg(ERRMSG_SINGLETON_JSON_ITEM_REQUIRED),
+							  errdetail("right operand of binary jsonpath operator %s "
+										"is not a singleton numeric value",
+										jspOperationName(jsp->type)))));
+
+	res = DirectFunctionCall2(func,
+							  NumericGetDatum(lval->val.numeric),
+							  NumericGetDatum(rval->val.numeric));
+
+	if (!jspGetNext(jsp, &elem) && !found)
+		return jperOk;
+
+	lval = palloc(sizeof(*lval));
+	lval->type = jbvNumeric;
+	lval->val.numeric = DatumGetNumeric(res);
+
+	return recursiveExecuteNext(cxt, jsp, &elem, lval, found, false);
+}
+
+/*
+ * Execute unary arithmetic expression for each numeric item in its operand's
+ * sequence.  Array operand is automatically unwrapped in lax mode.
+ */
+static JsonPathExecResult
+executeUnaryArithmExpr(JsonPathExecContext *cxt, JsonPathItem *jsp,
+					   JsonbValue *jb, PGFunction func, JsonValueList *found)
+{
+	JsonPathExecResult jper;
+	JsonPathExecResult jper2;
+	JsonPathItem elem;
+	JsonValueList seq = {0};
+	JsonValueListIterator it;
+	JsonbValue *val;
+	bool		hasNext;
+
+	jspGetArg(jsp, &elem);
+	jper = recursiveExecuteAndUnwrap(cxt, &elem, jb, true, &seq);
+
+	if (jperIsError(jper))
+		return jper;
+
+	jper = jperNotFound;
+
+	hasNext = jspGetNext(jsp, &elem);
+
+	JsonValueListInitIterator(&seq, &it);
+	while ((val = JsonValueListNext(&seq, &it)))
+	{
+		if ((val = getScalar(val, jbvNumeric)))
+		{
+			if (!found && !hasNext)
+				return jperOk;
+		}
+		else
+		{
+			if (!found && !hasNext)
+				continue;		/* skip non-numerics processing */
+
+			RETURN_ERROR(ereport(ERROR,
+								 (errcode(ERRCODE_JSON_NUMBER_NOT_FOUND),
+								  errmsg(ERRMSG_JSON_NUMBER_NOT_FOUND),
+								  errdetail("operand of unary jsonpath operator %s "
+											"is not a numeric value",
+											jspOperationName(jsp->type)))));
+		}
+
+		if (func)
+			val->val.numeric =
+				DatumGetNumeric(DirectFunctionCall1(func,
+													NumericGetDatum(val->val.numeric)));
+
+		jper2 = recursiveExecuteNext(cxt, jsp, &elem, val, found, false);
+
+		if (jperIsError(jper2))
+			return jper2;
+
+		if (jper2 == jperOk)
+		{
+			if (!found)
+				return jperOk;
+			jper = jperOk;
+		}
+	}
+
+	return jper;
+}
+
+/*
+ * STARTS_WITH predicate callback.
+ *
+ * Check if the 'whole' string starts from 'initial' string.
+ */
+static JsonPathBool
+executeStartsWith(JsonPathItem *jsp, JsonbValue *whole, JsonbValue *initial,
+				  void *param)
+{
+	if (!(whole = getScalar(whole, jbvString)))
+		return jpbUnknown;		/* error */
+
+	if (!(initial = getScalar(initial, jbvString)))
+		return jpbUnknown;		/* error */
+
+	if (whole->val.string.len >= initial->val.string.len &&
+		!memcmp(whole->val.string.val,
+				initial->val.string.val,
+				initial->val.string.len))
+		return jpbTrue;
+
+	return jpbFalse;
+}
+
+/*
+ * LIKE_REGEX predicate callback.
+ *
+ * Check if the string matches regex pattern.
+ */
+static JsonPathBool
+executeLikeRegex(JsonPathItem *jsp, JsonbValue *str, JsonbValue *rarg,
+				 void *param)
+{
+	JsonLikeRegexContext *cxt = param;
+
+	if (!(str = getScalar(str, jbvString)))
+		return jpbUnknown;
+
+	/* Cache regex text and converted flags. */
+	if (!cxt->regex)
+	{
+		uint32		flags = jsp->content.like_regex.flags;
+
+		cxt->regex =
+			cstring_to_text_with_len(jsp->content.like_regex.pattern,
+									 jsp->content.like_regex.patternlen);
+
+		/* Convert regex flags. */
+		cxt->cflags = REG_ADVANCED;
+
+		if (flags & JSP_REGEX_ICASE)
+			cxt->cflags |= REG_ICASE;
+		if (flags & JSP_REGEX_MLINE)
+			cxt->cflags |= REG_NEWLINE;
+		if (flags & JSP_REGEX_SLINE)
+			cxt->cflags &= ~REG_NEWLINE;
+		if (flags & JSP_REGEX_WSPACE)
+			cxt->cflags |= REG_EXPANDED;
+	}
+
+	if (RE_compile_and_execute(cxt->regex, str->val.string.val,
+							   str->val.string.len,
+							   cxt->cflags, DEFAULT_COLLATION_OID, 0, NULL))
+		return jpbTrue;
+
+	return jpbFalse;
+}
+
+static JsonPathExecResult
+executeNumericItemMethod(JsonPathExecContext *cxt, JsonPathItem *jsp,
+						 JsonbValue *jb, bool unwrap, PGFunction func,
+						 JsonValueList *found)
+{
+	JsonPathItem next;
+	Datum		datum;
+
+	if (unwrap && JsonbType(jb) == jbvArray)
+		return recursiveExecuteUnwrapArray(cxt, jsp, jb, found, false);
+
+	if (!(jb = getScalar(jb, jbvNumeric)))
+		RETURN_ERROR(ereport(ERROR,
+							 (errcode(ERRCODE_NON_NUMERIC_JSON_ITEM),
+							  errmsg(ERRMSG_NON_NUMERIC_JSON_ITEM),
+							  errdetail("jsonpath item method .%s() is applied to "
+										"not a numeric value",
+										jspOperationName(jsp->type)))));
+
+	datum = NumericGetDatum(jb->val.numeric);
+	datum = DirectFunctionCall1(func, datum);
+
+	if (!jspGetNext(jsp, &next) && !found)
+		return jperOk;
+
+	jb = palloc(sizeof(*jb));
+	jb->type = jbvNumeric;
+	jb->val.numeric = DatumGetNumeric(datum);
+
+	return recursiveExecuteNext(cxt, jsp, &next, jb, found, false);
+}
+
+/*
+ * Implementation of .keyvalue() method.
+ *
+ * .keyvalue() method returns a sequence of object's key-value pairs in the
+ * following format: '{ "key": key, "value": value, "id": id }'.
+ *
+ * "id" field is an object identifier which is constructed from the two parts:
+ * base object id and its binary offset in base object's jsonb:
+ * id = 10000000000 * base_object_id + obj_offset_in_base_object
+ *
+ * 10000000000 (10^10) -- is a first round decimal number greater than 2^32
+ * (maximal offset in jsonb).  Decimal multiplier is used here to improve the
+ * readability of identifiers.
+ *
+ * Base object is usually a root object of the path: context item '$' or path
+ * variable '$var', literals can't produce objects for now.  But if the path
+ * contains generated objects (.keyvalue() itself, for example), then they
+ * become base object for the subsequent .keyvalue().
+ *
+ * Id of '$' is 0. Id of '$var' is its ordinal (positive) number in the list
+ * of variables (see getJsonPathVariable()).  Ids for generated objects
+ * are assigned using global counter JsonPathExecContext.lastGeneratedObjectId.
+ */
+static JsonPathExecResult
+executeKeyValueMethod(JsonPathExecContext *cxt, JsonPathItem *jsp,
+					  JsonbValue *jb, JsonValueList *found)
+{
+	JsonPathExecResult res = jperNotFound;
+	JsonPathItem next;
+	JsonbContainer *jbc;
+	JsonbValue	key;
+	JsonbValue	val;
+	JsonbValue	idval;
+	JsonbValue	keystr;
+	JsonbValue	valstr;
+	JsonbValue	idstr;
+	JsonbIterator *it;
+	JsonbIteratorToken tok;
+	int64		id;
+	bool		hasNext;
+
+	if (JsonbType(jb) != jbvObject || jb->type != jbvBinary)
+		RETURN_ERROR(ereport(ERROR,
+							 (errcode(ERRCODE_JSON_OBJECT_NOT_FOUND),
+							  errmsg(ERRMSG_JSON_OBJECT_NOT_FOUND),
+							  errdetail("jsonpath item method .%s() is applied "
+										"to not an object",
+										jspOperationName(jsp->type)))));
+
+	jbc = jb->val.binary.data;
+
+	if (!JsonContainerSize(jbc))
+		return jperNotFound;	/* no key-value pairs */
+
+	hasNext = jspGetNext(jsp, &next);
+
+	keystr.type = jbvString;
+	keystr.val.string.val = "key";
+	keystr.val.string.len = 3;
+
+	valstr.type = jbvString;
+	valstr.val.string.val = "value";
+	valstr.val.string.len = 5;
+
+	idstr.type = jbvString;
+	idstr.val.string.val = "id";
+	idstr.val.string.len = 2;
+
+	/* construct object id from its base object and offset inside that */
+	id = jb->type != jbvBinary ? 0 :
+		(int64) ((char *) jbc - (char *) cxt->baseObject.jbc);
+	id += (int64) cxt->baseObject.id * INT64CONST(10000000000);
+
+	idval.type = jbvNumeric;
+	idval.val.numeric = DatumGetNumeric(DirectFunctionCall1(int8_numeric,
+															Int64GetDatum(id)));
+
+	it = JsonbIteratorInit(jbc);
+
+	while ((tok = JsonbIteratorNext(&it, &key, true)) != WJB_DONE)
+	{
+		JsonBaseObjectInfo baseObject;
+		JsonbValue	obj;
+		JsonbParseState *ps;
+		JsonbValue *keyval;
+		Jsonb	   *jsonb;
+
+		if (tok != WJB_KEY)
+			continue;
+
+		res = jperOk;
+
+		if (!hasNext && !found)
+			break;
+
+		tok = JsonbIteratorNext(&it, &val, true);
+		Assert(tok == WJB_VALUE);
+
+		ps = NULL;
+		pushJsonbValue(&ps, WJB_BEGIN_OBJECT, NULL);
+
+		pushJsonbValue(&ps, WJB_KEY, &keystr);
+		pushJsonbValue(&ps, WJB_VALUE, &key);
+
+		pushJsonbValue(&ps, WJB_KEY, &valstr);
+		pushJsonbValue(&ps, WJB_VALUE, &val);
+
+		pushJsonbValue(&ps, WJB_KEY, &idstr);
+		pushJsonbValue(&ps, WJB_VALUE, &idval);
+
+		keyval = pushJsonbValue(&ps, WJB_END_OBJECT, NULL);
+
+		jsonb = JsonbValueToJsonb(keyval);
+
+		JsonbInitBinary(&obj, jsonb);
+
+		baseObject = setBaseObject(cxt, &obj, cxt->lastGeneratedObjectId++);
+
+		res = recursiveExecuteNext(cxt, jsp, &next, &obj, found, true);
+
+		cxt->baseObject = baseObject;
+
+		if (jperIsError(res))
+			return res;
+
+		if (res == jperOk && !found)
+			break;
+	}
+
+	return res;
+}
+
+/*
+ * Convert boolean execution status 'res' to a boolean JSON item and execute
+ * next jsonpath.
+ */
+static JsonPathExecResult
+appendBoolResult(JsonPathExecContext *cxt, JsonPathItem *jsp,
+				 JsonValueList *found, JsonPathBool res)
+{
+	JsonPathItem next;
+	JsonbValue	jbv;
+
+	if (!jspGetNext(jsp, &next) && !found)
+		return jperOk;			/* found singleton boolean value */
+
+	if (res == jpbUnknown)
+	{
+		jbv.type = jbvNull;
+	}
+	else
+	{
+		jbv.type = jbvBool;
+		jbv.val.boolean = res == jpbTrue;
+	}
+
+	return recursiveExecuteNext(cxt, jsp, &next, &jbv, found, true);
+}
+
+/*
+ * Convert jsonpath's scalar or variable node to actual jsonb value.
+ *
+ * If node is a variable then its id returned, otherwise 0 returned.
+ */
+static void
+getJsonPathItem(JsonPathExecContext *cxt, JsonPathItem *item,
+				JsonbValue *value)
+{
+	switch (item->type)
+	{
+		case jpiNull:
+			value->type = jbvNull;
+			break;
+		case jpiBool:
+			value->type = jbvBool;
+			value->val.boolean = jspGetBool(item);
+			break;
+		case jpiNumeric:
+			value->type = jbvNumeric;
+			value->val.numeric = jspGetNumeric(item);
+			break;
+		case jpiString:
+			value->type = jbvString;
+			value->val.string.val = jspGetString(item,
+												 &value->val.string.len);
+			break;
+		case jpiVariable:
+			getJsonPathVariable(cxt, item, cxt->vars, value);
+			return;
+		default:
+			elog(ERROR, "unexpected jsonpath item type");
+	}
+}
+
+/*
+ * Get the value of variable passed to jsonpath executor
+ */
+static void
+getJsonPathVariable(JsonPathExecContext *cxt, JsonPathItem *variable,
+					Jsonb *vars, JsonbValue *value)
+{
+	char	   *varName;
+	int			varNameLength;
+	JsonbValue	tmp;
+	JsonbValue *v;
+
+	if (!vars)
+	{
+		value->type = jbvNull;
+		return;
+	}
+
+	Assert(variable->type == jpiVariable);
+	varName = jspGetString(variable, &varNameLength);
+	tmp.type = jbvString;
+	tmp.val.string.val = varName;
+	tmp.val.string.len = varNameLength;
+
+	v = findJsonbValueFromContainer(&vars->root, JB_FOBJECT, &tmp);
+
+	if (v)
+	{
+		*value = *v;
+		pfree(v);
+	}
+	else
+	{
+		ereport(ERROR,
+				(errcode(ERRCODE_UNDEFINED_OBJECT),
+				 errmsg("cannot find jsonpath variable '%s'",
+						pnstrdup(varName, varNameLength))));
+	}
+
+	JsonbInitBinary(&tmp, vars);
+	setBaseObject(cxt, &tmp, 1);
+}
+
+/**************** Support functions for JsonPath execution *****************/
+
+/*
+ * Returns the size of an array item, or -1 if item is not an array.
+ */
+static int
+JsonbArraySize(JsonbValue *jb)
+{
+	Assert(jb->type != jbvArray);
+
+	if (jb->type == jbvBinary)
+	{
+		JsonbContainer *jbc = jb->val.binary.data;
+
+		if (JsonContainerIsArray(jbc) && !JsonContainerIsScalar(jbc))
+			return JsonContainerSize(jbc);
+	}
+
+	return -1;
+}
+
+/* Comparison predicate callback. */
+static JsonPathBool
+executeComparison(JsonPathItem *cmp, JsonbValue *lv, JsonbValue *rv, void *p)
+{
+	return compareItems(cmp->type, lv, rv);
+}
+
+/*
+ * Compare two SQL/JSON items using comparison operation 'op'.
+ */
+static JsonPathBool
+compareItems(int32 op, JsonbValue *jb1, JsonbValue *jb2)
+{
+	int			cmp;
+	bool		res;
+
+	if (jb1->type != jb2->type)
+	{
+		if (jb1->type == jbvNull || jb2->type == jbvNull)
+
+			/*
+			 * Equality and order comparison of nulls to non-nulls returns
+			 * always false, but inequality comparison returns true.
+			 */
+			return op == jpiNotEqual ? jpbTrue : jpbFalse;
+
+		/* Non-null items of different types are not comparable. */
+		return jpbUnknown;
+	}
+
+	switch (jb1->type)
+	{
+		case jbvNull:
+			cmp = 0;
+			break;
+		case jbvBool:
+			cmp = jb1->val.boolean == jb2->val.boolean ? 0 :
+				jb1->val.boolean ? 1 : -1;
+			break;
+		case jbvNumeric:
+			cmp = compareNumeric(jb1->val.numeric, jb2->val.numeric);
+			break;
+		case jbvString:
+			if (op == jpiEqual)
+				return jb1->val.string.len != jb2->val.string.len ||
+					memcmp(jb1->val.string.val,
+						   jb2->val.string.val,
+						   jb1->val.string.len) ? jpbFalse : jpbTrue;
+
+			cmp = varstr_cmp(jb1->val.string.val, jb1->val.string.len,
+							 jb2->val.string.val, jb2->val.string.len,
+							 DEFAULT_COLLATION_OID);
+			break;
+
+		case jbvBinary:
+		case jbvArray:
+		case jbvObject:
+			return jpbUnknown;	/* non-scalars are not comparable */
+
+		default:
+			elog(ERROR, "invalid jsonb value type %d", jb1->type);
+	}
+
+	switch (op)
+	{
+		case jpiEqual:
+			res = (cmp == 0);
+			break;
+		case jpiNotEqual:
+			res = (cmp != 0);
+			break;
+		case jpiLess:
+			res = (cmp < 0);
+			break;
+		case jpiGreater:
+			res = (cmp > 0);
+			break;
+		case jpiLessOrEqual:
+			res = (cmp <= 0);
+			break;
+		case jpiGreaterOrEqual:
+			res = (cmp >= 0);
+			break;
+		default:
+			elog(ERROR, "unrecognized jsonpath operation: %d", op);
+			return jpbUnknown;
+	}
+
+	return res ? jpbTrue : jpbFalse;
+}
+
+/* Compare two numerics */
+static int
+compareNumeric(Numeric a, Numeric b)
+{
+	return DatumGetInt32(DirectFunctionCall2(numeric_cmp,
+											 PointerGetDatum(a),
+											 PointerGetDatum(b)));
+}
+
+static JsonbValue *
+copyJsonbValue(JsonbValue *src)
+{
+	JsonbValue *dst = palloc(sizeof(*dst));
+
+	*dst = *src;
+
+	return dst;
+}
+
+/*
+ * Execute array subscript expression and convert resulting numeric item to
+ * the integer type with truncation.
+ */
+static JsonPathExecResult
+getArrayIndex(JsonPathExecContext *cxt, JsonPathItem *jsp, JsonbValue *jb,
+			  int32 *index)
+{
+	JsonbValue *jbv;
+	JsonValueList found = {0};
+	JsonPathExecResult res = recursiveExecute(cxt, jsp, jb, &found);
+	Datum		numeric_index;
+
+	if (jperIsError(res))
+		return res;
+
+	if (JsonValueListLength(&found) != 1 ||
+		!(jbv = getScalar(JsonValueListHead(&found), jbvNumeric)))
+		RETURN_ERROR(ereport(ERROR,
+							 (errcode(ERRCODE_INVALID_JSON_SUBSCRIPT),
+							  errmsg(ERRMSG_INVALID_JSON_SUBSCRIPT),
+							  errdetail("jsonpath array subscript is not a "
+										"singleton numeric value"))));
+
+	numeric_index = DirectFunctionCall2(numeric_trunc,
+										NumericGetDatum(jbv->val.numeric),
+										Int32GetDatum(0));
+
+	*index = DatumGetInt32(DirectFunctionCall1(numeric_int4, numeric_index));
+
+	return jperOk;
+}
+
+/* Save base object and its id needed for the execution of .keyvalue(). */
+static JsonBaseObjectInfo
+setBaseObject(JsonPathExecContext *cxt, JsonbValue *jbv, int32 id)
+{
+	JsonBaseObjectInfo baseObject = cxt->baseObject;
+
+	cxt->baseObject.jbc = jbv->type != jbvBinary ? NULL :
+		(JsonbContainer *) jbv->val.binary.data;
+	cxt->baseObject.id = id;
+
+	return baseObject;
+}
+
+static void
+JsonValueListAppend(JsonValueList *jvl, JsonbValue *jbv)
+{
+	if (jvl->singleton)
+	{
+		jvl->list = list_make2(jvl->singleton, jbv);
+		jvl->singleton = NULL;
+	}
+	else if (!jvl->list)
+		jvl->singleton = jbv;
+	else
+		jvl->list = lappend(jvl->list, jbv);
+}
+
+static int
+JsonValueListLength(const JsonValueList *jvl)
+{
+	return jvl->singleton ? 1 : list_length(jvl->list);
+}
+
+static bool
+JsonValueListIsEmpty(JsonValueList *jvl)
+{
+	return !jvl->singleton && list_length(jvl->list) <= 0;
+}
+
+static JsonbValue *
+JsonValueListHead(JsonValueList *jvl)
+{
+	return jvl->singleton ? jvl->singleton : linitial(jvl->list);
+}
+
+static List *
+JsonValueListGetList(JsonValueList *jvl)
+{
+	if (jvl->singleton)
+		return list_make1(jvl->singleton);
+
+	return jvl->list;
+}
+
+static void
+JsonValueListInitIterator(const JsonValueList *jvl, JsonValueListIterator *it)
+{
+	if (jvl->singleton)
+	{
+		it->value = jvl->singleton;
+		it->next = NULL;
+	}
+	else if (list_head(jvl->list) != NULL)
+	{
+		it->value = (JsonbValue *) linitial(jvl->list);
+		it->next = lnext(list_head(jvl->list));
+	}
+	else
+	{
+		it->value = NULL;
+		it->next = NULL;
+	}
+}
+
+/*
+ * Get the next item from the sequence advancing iterator.
+ */
+static JsonbValue *
+JsonValueListNext(const JsonValueList *jvl, JsonValueListIterator *it)
+{
+	JsonbValue *result = it->value;
+
+	if (it->next)
+	{
+		it->value = lfirst(it->next);
+		it->next = lnext(it->next);
+	}
+	else
+	{
+		it->value = NULL;
+	}
+
+	return result;
+}
+
+/*
+ * Initialize a binary JsonbValue with the given jsonb container.
+ */
+static JsonbValue *
+JsonbInitBinary(JsonbValue *jbv, Jsonb *jb)
+{
+	jbv->type = jbvBinary;
+	jbv->val.binary.data = &jb->root;
+	jbv->val.binary.len = VARSIZE_ANY_EXHDR(jb);
+
+	return jbv;
+}
+
+/*
+ * Returns jbv* type of of JsonbValue. Note, it never returns jbvBinary as is.
+ */
+static int
+JsonbType(JsonbValue *jb)
+{
+	int			type = jb->type;
+
+	if (jb->type == jbvBinary)
+	{
+		JsonbContainer *jbc = (void *) jb->val.binary.data;
+
+		/* Scalars should be always extracted during jsonpath execution. */
+		Assert(!JsonContainerIsScalar(jbc));
+
+		if (JsonContainerIsObject(jbc))
+			type = jbvObject;
+		else if (JsonContainerIsArray(jbc))
+			type = jbvArray;
+		else
+			elog(ERROR, "invalid jsonb container type: 0x%08x", jbc->header);
+	}
+
+	return type;
+}
+
+/* Get scalar of given type or NULL on type mismatch */
+static JsonbValue *
+getScalar(JsonbValue *scalar, enum jbvType type)
+{
+	/* Scalars should be always extracted during jsonpath execution. */
+	Assert(scalar->type != jbvBinary ||
+		   !JsonContainerIsScalar(scalar->val.binary.data));
+
+	return scalar->type == type ? scalar : NULL;
+}
+
+/* Construct a JSON array from the item list */
+static JsonbValue *
+wrapItemsInArray(const JsonValueList *items)
+{
+	JsonbParseState *ps = NULL;
+	JsonValueListIterator it;
+	JsonbValue *jbv;
+
+	pushJsonbValue(&ps, WJB_BEGIN_ARRAY, NULL);
+
+	JsonValueListInitIterator(items, &it);
+	while ((jbv = JsonValueListNext(items, &it)))
+		pushJsonbValue(&ps, WJB_ELEM, jbv);
+
+	return pushJsonbValue(&ps, WJB_END_ARRAY, NULL);
+}
diff --git a/src/backend/utils/adt/jsonpath_gram.y b/src/backend/utils/adt/jsonpath_gram.y
new file mode 100644
index 0000000..183861f
--- /dev/null
+++ b/src/backend/utils/adt/jsonpath_gram.y
@@ -0,0 +1,480 @@
+/*-------------------------------------------------------------------------
+ *
+ * jsonpath_gram.y
+ *	 Grammar definitions for jsonpath datatype
+ *
+ * Copyright (c) 2019, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	src/backend/utils/adt/jsonpath_gram.y
+ *
+ *-------------------------------------------------------------------------
+ */
+
+%{
+#include "postgres.h"
+
+#include "catalog/pg_collation.h"
+#include "fmgr.h"
+#include "miscadmin.h"
+#include "nodes/pg_list.h"
+#include "regex/regex.h"
+#include "utils/builtins.h"
+#include "utils/jsonpath.h"
+#include "utils/jsonpath_scanner.h"
+
+/*
+ * Bison doesn't allocate anything that needs to live across parser calls,
+ * so we can easily have it use palloc instead of malloc.  This prevents
+ * memory leaks if we error out during parsing.  Note this only works with
+ * bison >= 2.0.  However, in bison 1.875 the default is to use alloca()
+ * if possible, so there's not really much problem anyhow, at least if
+ * you're building with gcc.
+ */
+#define YYMALLOC palloc
+#define YYFREE   pfree
+
+static JsonPathParseItem*
+makeItemType(int type)
+{
+	JsonPathParseItem* v = palloc(sizeof(*v));
+
+	CHECK_FOR_INTERRUPTS();
+
+	v->type = type;
+	v->next = NULL;
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeItemString(string *s)
+{
+	JsonPathParseItem *v;
+
+	if (s == NULL)
+	{
+		v = makeItemType(jpiNull);
+	}
+	else
+	{
+		v = makeItemType(jpiString);
+		v->value.string.val = s->val;
+		v->value.string.len = s->len;
+	}
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeItemVariable(string *s)
+{
+	JsonPathParseItem *v;
+
+	v = makeItemType(jpiVariable);
+	v->value.string.val = s->val;
+	v->value.string.len = s->len;
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeItemKey(string *s)
+{
+	JsonPathParseItem *v;
+
+	v = makeItemString(s);
+	v->type = jpiKey;
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeItemNumeric(string *s)
+{
+	JsonPathParseItem		*v;
+
+	v = makeItemType(jpiNumeric);
+	v->value.numeric =
+		DatumGetNumeric(DirectFunctionCall3(numeric_in,
+											CStringGetDatum(s->val), 0, -1));
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeItemBool(bool val) {
+	JsonPathParseItem *v = makeItemType(jpiBool);
+
+	v->value.boolean = val;
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeItemBinary(int type, JsonPathParseItem* la, JsonPathParseItem *ra)
+{
+	JsonPathParseItem  *v = makeItemType(type);
+
+	v->value.args.left = la;
+	v->value.args.right = ra;
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeItemUnary(int type, JsonPathParseItem* a)
+{
+	JsonPathParseItem  *v;
+
+	if (type == jpiPlus && a->type == jpiNumeric && !a->next)
+		return a;
+
+	if (type == jpiMinus && a->type == jpiNumeric && !a->next)
+	{
+		v = makeItemType(jpiNumeric);
+		v->value.numeric =
+			DatumGetNumeric(DirectFunctionCall1(numeric_uminus,
+												NumericGetDatum(a->value.numeric)));
+		return v;
+	}
+
+	v = makeItemType(type);
+
+	v->value.arg = a;
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeItemList(List *list)
+{
+	JsonPathParseItem *head, *end;
+	ListCell   *cell = list_head(list);
+
+	head = end = (JsonPathParseItem *) lfirst(cell);
+
+	if (!lnext(cell))
+		return head;
+
+	/* append items to the end of already existing list */
+	while (end->next)
+		end = end->next;
+
+	for_each_cell(cell, lnext(cell))
+	{
+		JsonPathParseItem *c = (JsonPathParseItem *) lfirst(cell);
+
+		end->next = c;
+		end = c;
+	}
+
+	return head;
+}
+
+static JsonPathParseItem*
+makeIndexArray(List *list)
+{
+	JsonPathParseItem	*v = makeItemType(jpiIndexArray);
+	ListCell			*cell;
+	int					i = 0;
+
+	Assert(list_length(list) > 0);
+	v->value.array.nelems = list_length(list);
+
+	v->value.array.elems = palloc(sizeof(v->value.array.elems[0]) *
+								  v->value.array.nelems);
+
+	foreach(cell, list)
+	{
+		JsonPathParseItem *jpi = lfirst(cell);
+
+		Assert(jpi->type == jpiSubscript);
+
+		v->value.array.elems[i].from = jpi->value.args.left;
+		v->value.array.elems[i++].to = jpi->value.args.right;
+	}
+
+	return v;
+}
+
+static JsonPathParseItem*
+makeAny(int first, int last)
+{
+	JsonPathParseItem *v = makeItemType(jpiAny);
+
+	v->value.anybounds.first = (first >= 0) ? first : PG_UINT32_MAX;
+	v->value.anybounds.last = (last >= 0) ? last : PG_UINT32_MAX;
+
+	return v;
+}
+
+static JsonPathParseItem *
+makeItemLikeRegex(JsonPathParseItem *expr, string *pattern, string *flags)
+{
+	JsonPathParseItem *v = makeItemType(jpiLikeRegex);
+	int			i;
+	int			cflags = REG_ADVANCED;
+
+	v->value.like_regex.expr = expr;
+	v->value.like_regex.pattern = pattern->val;
+	v->value.like_regex.patternlen = pattern->len;
+	v->value.like_regex.flags = 0;
+
+	for (i = 0; flags && i < flags->len; i++)
+	{
+		switch (flags->val[i])
+		{
+			case 'i':
+				v->value.like_regex.flags |= JSP_REGEX_ICASE;
+				cflags |= REG_ICASE;
+				break;
+			case 's':
+				v->value.like_regex.flags &= ~JSP_REGEX_MLINE;
+				v->value.like_regex.flags |= JSP_REGEX_SLINE;
+				cflags |= REG_NEWLINE;
+				break;
+			case 'm':
+				v->value.like_regex.flags &= ~JSP_REGEX_SLINE;
+				v->value.like_regex.flags |= JSP_REGEX_MLINE;
+				cflags &= ~REG_NEWLINE;
+				break;
+			case 'x':
+				v->value.like_regex.flags |= JSP_REGEX_WSPACE;
+				cflags |= REG_EXPANDED;
+				break;
+			default:
+				yyerror(NULL, "unrecognized flag of LIKE_REGEX predicate");
+				break;
+		}
+	}
+
+	/* check regex validity */
+	(void) RE_compile_and_cache(cstring_to_text_with_len(pattern->val,
+														 pattern->len),
+								cflags, DEFAULT_COLLATION_OID);
+
+	return v;
+}
+
+%}
+
+/* BISON Declarations */
+%pure-parser
+%expect 0
+%name-prefix="jsonpath_yy"
+%error-verbose
+%parse-param {JsonPathParseResult **result}
+
+%union {
+	string				str;
+	List				*elems;		/* list of JsonPathParseItem */
+	List				*indexs;	/* list of integers */
+	JsonPathParseItem	*value;
+	JsonPathParseResult *result;
+	JsonPathItemType	optype;
+	bool				boolean;
+	int					integer;
+}
+
+%token	<str>		TO_P NULL_P TRUE_P FALSE_P IS_P UNKNOWN_P EXISTS_P
+%token	<str>		IDENT_P STRING_P NUMERIC_P INT_P VARIABLE_P
+%token	<str>		OR_P AND_P NOT_P
+%token	<str>		LESS_P LESSEQUAL_P EQUAL_P NOTEQUAL_P GREATEREQUAL_P GREATER_P
+%token	<str>		ANY_P STRICT_P LAX_P LAST_P STARTS_P WITH_P LIKE_REGEX_P FLAG_P
+%token	<str>		ABS_P SIZE_P TYPE_P FLOOR_P DOUBLE_P CEILING_P KEYVALUE_P
+
+%type	<result>	result
+
+%type	<value>		scalar_value path_primary expr array_accessor
+					any_path accessor_op key predicate delimited_predicate
+					index_elem starts_with_initial expr_or_predicate
+
+%type	<elems>		accessor_expr
+
+%type	<indexs>	index_list
+
+%type	<optype>	comp_op method
+
+%type	<boolean>	mode
+
+%type	<str>		key_name
+
+%type	<integer>	any_level
+
+%left	OR_P
+%left	AND_P
+%right	NOT_P
+%left	'+' '-'
+%left	'*' '/' '%'
+%left	UMINUS
+%nonassoc '(' ')'
+
+/* Grammar follows */
+%%
+
+result:
+	mode expr_or_predicate			{
+										*result = palloc(sizeof(JsonPathParseResult));
+										(*result)->expr = $2;
+										(*result)->lax = $1;
+									}
+	| /* EMPTY */					{ *result = NULL; }
+	;
+
+expr_or_predicate:
+	expr							{ $$ = $1; }
+	| predicate						{ $$ = $1; }
+	;
+
+mode:
+	STRICT_P						{ $$ = false; }
+	| LAX_P							{ $$ = true; }
+	| /* EMPTY */					{ $$ = true; }
+	;
+
+scalar_value:
+	STRING_P						{ $$ = makeItemString(&$1); }
+	| NULL_P						{ $$ = makeItemString(NULL); }
+	| TRUE_P						{ $$ = makeItemBool(true); }
+	| FALSE_P						{ $$ = makeItemBool(false); }
+	| NUMERIC_P						{ $$ = makeItemNumeric(&$1); }
+	| INT_P							{ $$ = makeItemNumeric(&$1); }
+	| VARIABLE_P 					{ $$ = makeItemVariable(&$1); }
+	;
+
+comp_op:
+	EQUAL_P							{ $$ = jpiEqual; }
+	| NOTEQUAL_P					{ $$ = jpiNotEqual; }
+	| LESS_P						{ $$ = jpiLess; }
+	| GREATER_P						{ $$ = jpiGreater; }
+	| LESSEQUAL_P					{ $$ = jpiLessOrEqual; }
+	| GREATEREQUAL_P				{ $$ = jpiGreaterOrEqual; }
+	;
+
+delimited_predicate:
+	'(' predicate ')'						{ $$ = $2; }
+	| EXISTS_P '(' expr ')'			{ $$ = makeItemUnary(jpiExists, $3); }
+	;
+
+predicate:
+	delimited_predicate				{ $$ = $1; }
+	| expr comp_op expr				{ $$ = makeItemBinary($2, $1, $3); }
+	| predicate AND_P predicate		{ $$ = makeItemBinary(jpiAnd, $1, $3); }
+	| predicate OR_P predicate		{ $$ = makeItemBinary(jpiOr, $1, $3); }
+	| NOT_P delimited_predicate 	{ $$ = makeItemUnary(jpiNot, $2); }
+	| '(' predicate ')' IS_P UNKNOWN_P	{ $$ = makeItemUnary(jpiIsUnknown, $2); }
+	| expr STARTS_P WITH_P starts_with_initial
+		{ $$ = makeItemBinary(jpiStartsWith, $1, $4); }
+	| expr LIKE_REGEX_P STRING_P 	{ $$ = makeItemLikeRegex($1, &$3, NULL); }
+	| expr LIKE_REGEX_P STRING_P FLAG_P STRING_P
+									{ $$ = makeItemLikeRegex($1, &$3, &$5); }
+	;
+
+starts_with_initial:
+	STRING_P						{ $$ = makeItemString(&$1); }
+	| VARIABLE_P					{ $$ = makeItemVariable(&$1); }
+	;
+
+path_primary:
+	scalar_value					{ $$ = $1; }
+	| '$'							{ $$ = makeItemType(jpiRoot); }
+	| '@'							{ $$ = makeItemType(jpiCurrent); }
+	| LAST_P						{ $$ = makeItemType(jpiLast); }
+	;
+
+accessor_expr:
+	path_primary					{ $$ = list_make1($1); }
+	| '(' expr ')' accessor_op		{ $$ = list_make2($2, $4); }
+	| '(' predicate ')' accessor_op	{ $$ = list_make2($2, $4); }
+	| accessor_expr accessor_op		{ $$ = lappend($1, $2); }
+	;
+
+expr:
+	accessor_expr					{ $$ = makeItemList($1); }
+	| '(' expr ')'					{ $$ = $2; }
+	| '+' expr %prec UMINUS			{ $$ = makeItemUnary(jpiPlus, $2); }
+	| '-' expr %prec UMINUS			{ $$ = makeItemUnary(jpiMinus, $2); }
+	| expr '+' expr					{ $$ = makeItemBinary(jpiAdd, $1, $3); }
+	| expr '-' expr					{ $$ = makeItemBinary(jpiSub, $1, $3); }
+	| expr '*' expr					{ $$ = makeItemBinary(jpiMul, $1, $3); }
+	| expr '/' expr					{ $$ = makeItemBinary(jpiDiv, $1, $3); }
+	| expr '%' expr					{ $$ = makeItemBinary(jpiMod, $1, $3); }
+	;
+
+index_elem:
+	expr							{ $$ = makeItemBinary(jpiSubscript, $1, NULL); }
+	| expr TO_P expr				{ $$ = makeItemBinary(jpiSubscript, $1, $3); }
+	;
+
+index_list:
+	index_elem						{ $$ = list_make1($1); }
+	| index_list ',' index_elem		{ $$ = lappend($1, $3); }
+	;
+
+array_accessor:
+	'[' '*' ']'						{ $$ = makeItemType(jpiAnyArray); }
+	| '[' index_list ']'			{ $$ = makeIndexArray($2); }
+	;
+
+any_level:
+	INT_P							{ $$ = pg_atoi($1.val, 4, 0); }
+	| LAST_P						{ $$ = -1; }
+	;
+
+any_path:
+	ANY_P							{ $$ = makeAny(0, -1); }
+	| ANY_P '{' any_level '}'		{ $$ = makeAny($3, $3); }
+	| ANY_P '{' any_level TO_P any_level '}'	{ $$ = makeAny($3, $5); }
+	;
+
+accessor_op:
+	'.' key							{ $$ = $2; }
+	| '.' '*'						{ $$ = makeItemType(jpiAnyKey); }
+	| array_accessor				{ $$ = $1; }
+	| '.' any_path					{ $$ = $2; }
+	| '.' method '(' ')'			{ $$ = makeItemType($2); }
+	| '?' '(' predicate ')'			{ $$ = makeItemUnary(jpiFilter, $3); }
+	;
+
+key:
+	key_name						{ $$ = makeItemKey(&$1); }
+	;
+
+key_name:
+	IDENT_P
+	| STRING_P
+	| TO_P
+	| NULL_P
+	| TRUE_P
+	| FALSE_P
+	| IS_P
+	| UNKNOWN_P
+	| EXISTS_P
+	| STRICT_P
+	| LAX_P
+	| ABS_P
+	| SIZE_P
+	| TYPE_P
+	| FLOOR_P
+	| DOUBLE_P
+	| CEILING_P
+	| KEYVALUE_P
+	| LAST_P
+	| STARTS_P
+	| WITH_P
+	| LIKE_REGEX_P
+	| FLAG_P
+	;
+
+method:
+	ABS_P							{ $$ = jpiAbs; }
+	| SIZE_P						{ $$ = jpiSize; }
+	| TYPE_P						{ $$ = jpiType; }
+	| FLOOR_P						{ $$ = jpiFloor; }
+	| DOUBLE_P						{ $$ = jpiDouble; }
+	| CEILING_P						{ $$ = jpiCeiling; }
+	| KEYVALUE_P					{ $$ = jpiKeyValue; }
+	;
+%%
+
diff --git a/src/backend/utils/adt/jsonpath_scan.l b/src/backend/utils/adt/jsonpath_scan.l
new file mode 100644
index 0000000..110ea21
--- /dev/null
+++ b/src/backend/utils/adt/jsonpath_scan.l
@@ -0,0 +1,638 @@
+/*-------------------------------------------------------------------------
+ *
+ * jsonpath_scan.l
+ *	Lexical parser for jsonpath datatype
+ *
+ * Copyright (c) 2019, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	src/backend/utils/adt/jsonpath_scan.l
+ *
+ *-------------------------------------------------------------------------
+ */
+
+%{
+#include "postgres.h"
+
+#include "mb/pg_wchar.h"
+#include "nodes/pg_list.h"
+#include "utils/jsonpath_scanner.h"
+
+static string scanstring;
+
+/* No reason to constrain amount of data slurped */
+/* #define YY_READ_BUF_SIZE 16777216 */
+
+/* Handles to the buffer that the lexer uses internally */
+static YY_BUFFER_STATE scanbufhandle;
+static char *scanbuf;
+static int	scanbuflen;
+
+static void addstring(bool init, char *s, int l);
+static void addchar(bool init, char s);
+static int checkSpecialVal(void); /* examine scanstring for the special
+								   * value */
+
+static void parseUnicode(char *s, int l);
+static void parseHexChars(char *s, int l);
+
+/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
+#undef fprintf
+#define fprintf(file, fmt, msg)  fprintf_to_ereport(fmt, msg)
+
+static void
+fprintf_to_ereport(const char *fmt, const char *msg)
+{
+	ereport(ERROR, (errmsg_internal("%s", msg)));
+}
+
+#define yyerror jsonpath_yyerror
+%}
+
+%option 8bit
+%option never-interactive
+%option nodefault
+%option noinput
+%option nounput
+%option noyywrap
+%option warn
+%option prefix="jsonpath_yy"
+%option bison-bridge
+%option noyyalloc
+%option noyyrealloc
+%option noyyfree
+
+%x xQUOTED
+%x xNONQUOTED
+%x xVARQUOTED
+%x xSINGLEQUOTED
+%x xCOMMENT
+
+special		 [\?\%\$\.\[\]\{\}\(\)\|\&\!\=\<\>\@\#\,\*:\-\+\/]
+any			[^\?\%\$\.\[\]\{\}\(\)\|\&\!\=\<\>\@\#\,\*:\-\+\/\\\"\' \t\n\r\f]
+blank		[ \t\n\r\f]
+hex_dig		[0-9A-Fa-f]
+unicode		\\u({hex_dig}{4}|\{{hex_dig}{1,6}\})
+hex_char	\\x{hex_dig}{2}
+
+
+%%
+
+<INITIAL>\&\&					{ return AND_P; }
+
+<INITIAL>\|\|					{ return OR_P; }
+
+<INITIAL>\!						{ return NOT_P; }
+
+<INITIAL>\*\*					{ return ANY_P; }
+
+<INITIAL>\<						{ return LESS_P; }
+
+<INITIAL>\<\=					{ return LESSEQUAL_P; }
+
+<INITIAL>\=\=					{ return EQUAL_P; }
+
+<INITIAL>\<\>					{ return NOTEQUAL_P; }
+
+<INITIAL>\!\=					{ return NOTEQUAL_P; }
+
+<INITIAL>\>\=					{ return GREATEREQUAL_P; }
+
+<INITIAL>\>						{ return GREATER_P; }
+
+<INITIAL>\${any}+				{
+									addstring(true, yytext + 1, yyleng - 1);
+									addchar(false, '\0');
+									yylval->str = scanstring;
+									return VARIABLE_P;
+								}
+
+<INITIAL>\$\"					{
+									addchar(true, '\0');
+									BEGIN xVARQUOTED;
+								}
+
+<INITIAL>{special}				{ return *yytext; }
+
+<INITIAL>{blank}+				{ /* ignore */ }
+
+<INITIAL>\/\*					{
+									addchar(true, '\0');
+									BEGIN xCOMMENT;
+								}
+
+<INITIAL>[0-9]+(\.[0-9]+)?[eE][+-]?[0-9]+  /* float */  {
+									addstring(true, yytext, yyleng);
+									addchar(false, '\0');
+									yylval->str = scanstring;
+									return NUMERIC_P;
+								}
+
+<INITIAL>\.[0-9]+[eE][+-]?[0-9]+  /* float */  {
+									addstring(true, yytext, yyleng);
+									addchar(false, '\0');
+									yylval->str = scanstring;
+									return NUMERIC_P;
+								}
+
+<INITIAL>([0-9]+)?\.[0-9]+		{
+									addstring(true, yytext, yyleng);
+									addchar(false, '\0');
+									yylval->str = scanstring;
+									return NUMERIC_P;
+								}
+
+<INITIAL>[0-9]+					{
+									addstring(true, yytext, yyleng);
+									addchar(false, '\0');
+									yylval->str = scanstring;
+									return INT_P;
+								}
+
+<INITIAL>{any}+					{
+									addstring(true, yytext, yyleng);
+									BEGIN xNONQUOTED;
+								}
+
+<INITIAL>\"						{
+									addchar(true, '\0');
+									BEGIN xQUOTED;
+								}
+
+<INITIAL>\'						{
+									addchar(true, '\0');
+									BEGIN xSINGLEQUOTED;
+								}
+
+<INITIAL>\\						{
+									yyless(0);
+									addchar(true, '\0');
+									BEGIN xNONQUOTED;
+								}
+
+<xNONQUOTED>{any}+				{
+									addstring(false, yytext, yyleng);
+								}
+
+<xNONQUOTED>{blank}+			{
+									yylval->str = scanstring;
+									BEGIN INITIAL;
+									return checkSpecialVal();
+								}
+
+
+<xNONQUOTED>\/\*				{
+									yylval->str = scanstring;
+									BEGIN xCOMMENT;
+								}
+
+<xNONQUOTED>({special}|\"|\')	{
+									yylval->str = scanstring;
+									yyless(0);
+									BEGIN INITIAL;
+									return checkSpecialVal();
+								}
+
+<xNONQUOTED><<EOF>>				{
+									yylval->str = scanstring;
+									BEGIN INITIAL;
+									return checkSpecialVal();
+								}
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\[\"\'\\]	{ addchar(false, yytext[1]); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\b	{ addchar(false, '\b'); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\f	{ addchar(false, '\f'); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\n	{ addchar(false, '\n'); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\r	{ addchar(false, '\r'); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\t	{ addchar(false, '\t'); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\v	{ addchar(false, '\v'); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>{unicode}+		{ parseUnicode(yytext, yyleng); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>{hex_char}+	{ parseHexChars(yytext, yyleng); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\x	{ yyerror(NULL, "Hex character sequence is invalid"); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\u	{ yyerror(NULL, "Unicode sequence is invalid"); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\.	{ yyerror(NULL, "Escape sequence is invalid"); }
+
+<xNONQUOTED,xQUOTED,xVARQUOTED,xSINGLEQUOTED>\\		{ yyerror(NULL, "Unexpected end after backslash"); }
+
+<xQUOTED,xVARQUOTED,xSINGLEQUOTED><<EOF>>			{ yyerror(NULL, "Unexpected end of quoted string"); }
+
+<xQUOTED>\"						{
+									yylval->str = scanstring;
+									BEGIN INITIAL;
+									return STRING_P;
+								}
+
+<xVARQUOTED>\"					{
+									yylval->str = scanstring;
+									BEGIN INITIAL;
+									return VARIABLE_P;
+								}
+
+<xSINGLEQUOTED>\'				{
+									yylval->str = scanstring;
+									BEGIN INITIAL;
+									return STRING_P;
+								}
+
+<xQUOTED,xVARQUOTED>[^\\\"]+	{ addstring(false, yytext, yyleng); }
+
+<xSINGLEQUOTED>[^\\\']+			{ addstring(false, yytext, yyleng); }
+
+<INITIAL><<EOF>>				{ yyterminate(); }
+
+<xCOMMENT>\*\/					{ BEGIN INITIAL; }
+
+<xCOMMENT>[^\*]+				{ }
+
+<xCOMMENT>\*					{ }
+
+<xCOMMENT><<EOF>>				{ yyerror(NULL, "Unexpected end of comment"); }
+
+%%
+
+void
+jsonpath_yyerror(JsonPathParseResult **result, const char *message)
+{
+	if (*yytext == YY_END_OF_BUFFER_CHAR)
+	{
+		ereport(ERROR,
+				(errcode(ERRCODE_SYNTAX_ERROR),
+				 errmsg("bad jsonpath representation"),
+				 /* translator: %s is typically "syntax error" */
+				 errdetail("%s at end of input", message)));
+	}
+	else
+	{
+		ereport(ERROR,
+				(errcode(ERRCODE_SYNTAX_ERROR),
+				 errmsg("bad jsonpath representation"),
+				 /* translator: first %s is typically "syntax error" */
+				 errdetail("%s at or near \"%s\"", message, yytext)));
+	}
+}
+
+typedef struct keyword
+{
+	int16	len;
+	bool	lowercase;
+	int		val;
+	char	*keyword;
+} keyword;
+
+/*
+ * Array of key words should be sorted by length and then
+ * alphabetical order
+ */
+
+static keyword keywords[] = {
+	{ 2, false,	IS_P,		"is"},
+	{ 2, false,	TO_P,		"to"},
+	{ 3, false,	ABS_P,		"abs"},
+	{ 3, false,	LAX_P,		"lax"},
+	{ 4, false,	FLAG_P,		"flag"},
+	{ 4, false,	LAST_P,		"last"},
+	{ 4, true,	NULL_P,		"null"},
+	{ 4, false,	SIZE_P,		"size"},
+	{ 4, true,	TRUE_P,		"true"},
+	{ 4, false,	TYPE_P,		"type"},
+	{ 4, false,	WITH_P,		"with"},
+	{ 5, true,	FALSE_P,	"false"},
+	{ 5, false,	FLOOR_P,	"floor"},
+	{ 6, false,	DOUBLE_P,	"double"},
+	{ 6, false,	EXISTS_P,	"exists"},
+	{ 6, false,	STARTS_P,	"starts"},
+	{ 6, false,	STRICT_P,	"strict"},
+	{ 7, false,	CEILING_P,	"ceiling"},
+	{ 7, false,	UNKNOWN_P,	"unknown"},
+	{ 8, false,	KEYVALUE_P,	"keyvalue"},
+	{ 10,false, LIKE_REGEX_P, "like_regex"},
+};
+
+static int
+checkSpecialVal()
+{
+	int			res = IDENT_P;
+	int			diff;
+	keyword		*StopLow = keywords,
+				*StopHigh = keywords + lengthof(keywords),
+				*StopMiddle;
+
+	if (scanstring.len > keywords[lengthof(keywords) - 1].len)
+		return res;
+
+	while(StopLow < StopHigh)
+	{
+		StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
+
+		if (StopMiddle->len == scanstring.len)
+			diff = pg_strncasecmp(StopMiddle->keyword, scanstring.val,
+								  scanstring.len);
+		else
+			diff = StopMiddle->len - scanstring.len;
+
+		if (diff < 0)
+			StopLow = StopMiddle + 1;
+		else if (diff > 0)
+			StopHigh = StopMiddle;
+		else
+		{
+			if (StopMiddle->lowercase)
+				diff = strncmp(StopMiddle->keyword, scanstring.val,
+							   scanstring.len);
+
+			if (diff == 0)
+				res = StopMiddle->val;
+
+			break;
+		}
+	}
+
+	return res;
+}
+
+/*
+ * Called before any actual parsing is done
+ */
+static void
+jsonpath_scanner_init(const char *str, int slen)
+{
+	if (slen <= 0)
+		slen = strlen(str);
+
+	/*
+	 * Might be left over after ereport()
+	 */
+	yy_init_globals();
+
+	/*
+	 * Make a scan buffer with special termination needed by flex.
+	 */
+
+	scanbuflen = slen;
+	scanbuf = palloc(slen + 2);
+	memcpy(scanbuf, str, slen);
+	scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
+	scanbufhandle = yy_scan_buffer(scanbuf, slen + 2);
+
+	BEGIN(INITIAL);
+}
+
+
+/*
+ * Called after parsing is done to clean up after jsonpath_scanner_init()
+ */
+static void
+jsonpath_scanner_finish(void)
+{
+	yy_delete_buffer(scanbufhandle);
+	pfree(scanbuf);
+}
+
+static void
+addstring(bool init, char *s, int l)
+{
+	if (init)
+	{
+		scanstring.total = 32;
+		scanstring.val = palloc(scanstring.total);
+		scanstring.len = 0;
+	}
+
+	if (s && l)
+	{
+		while(scanstring.len + l + 1 >= scanstring.total)
+		{
+			scanstring.total *= 2;
+			scanstring.val = repalloc(scanstring.val, scanstring.total);
+		}
+
+		memcpy(scanstring.val + scanstring.len, s, l);
+		scanstring.len += l;
+	}
+}
+
+static void
+addchar(bool init, char s)
+{
+	if (init)
+	{
+		scanstring.total = 32;
+		scanstring.val = palloc(scanstring.total);
+		scanstring.len = 0;
+	}
+	else if(scanstring.len + 1 >= scanstring.total)
+	{
+		scanstring.total *= 2;
+		scanstring.val = repalloc(scanstring.val, scanstring.total);
+	}
+
+	scanstring.val[ scanstring.len ] = s;
+	if (s != '\0')
+		scanstring.len++;
+}
+
+JsonPathParseResult *
+parsejsonpath(const char *str, int len)
+{
+	JsonPathParseResult	*parseresult;
+
+	jsonpath_scanner_init(str, len);
+
+	if (jsonpath_yyparse((void*)&parseresult) != 0)
+		jsonpath_yyerror(NULL, "bugus input");
+
+	jsonpath_scanner_finish();
+
+	return parseresult;
+}
+
+static int
+hexval(char c)
+{
+	if (c >= '0' && c <= '9')
+		return c - '0';
+	if (c >= 'a' && c <= 'f')
+		return c - 'a' + 0xA;
+	if (c >= 'A' && c <= 'F')
+		return c - 'A' + 0xA;
+	elog(ERROR, "invalid hexadecimal digit");
+	return 0; /* not reached */
+}
+
+static void
+addUnicodeChar(int ch)
+{
+	/*
+	 * For UTF8, replace the escape sequence by the actual
+	 * utf8 character in lex->strval. Do this also for other
+	 * encodings if the escape designates an ASCII character,
+	 * otherwise raise an error.
+	 */
+
+	if (ch == 0)
+	{
+		/* We can't allow this, since our TEXT type doesn't */
+		ereport(ERROR,
+				(errcode(ERRCODE_UNTRANSLATABLE_CHARACTER),
+				 errmsg("unsupported Unicode escape sequence"),
+				  errdetail("\\u0000 cannot be converted to text.")));
+	}
+	else if (GetDatabaseEncoding() == PG_UTF8)
+	{
+		char utf8str[5];
+		int utf8len;
+
+		unicode_to_utf8(ch, (unsigned char *) utf8str);
+		utf8len = pg_utf_mblen((unsigned char *) utf8str);
+		addstring(false, utf8str, utf8len);
+	}
+	else if (ch <= 0x007f)
+	{
+		/*
+		 * This is the only way to designate things like a
+		 * form feed character in JSON, so it's useful in all
+		 * encodings.
+		 */
+		addchar(false, (char) ch);
+	}
+	else
+	{
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+				 errmsg("invalid input syntax for type jsonpath"),
+				 errdetail("Unicode escape values cannot be used for code "
+						   "point values above 007F when the server encoding "
+						   "is not UTF8.")));
+	}
+}
+
+static void
+addUnicode(int ch, int *hi_surrogate)
+{
+	if (ch >= 0xd800 && ch <= 0xdbff)
+	{
+		if (*hi_surrogate != -1)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+					 errmsg("invalid input syntax for type jsonpath"),
+					 errdetail("Unicode high surrogate must not follow "
+							   "a high surrogate.")));
+		*hi_surrogate = (ch & 0x3ff) << 10;
+		return;
+	}
+	else if (ch >= 0xdc00 && ch <= 0xdfff)
+	{
+		if (*hi_surrogate == -1)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+					 errmsg("invalid input syntax for type jsonpath"),
+					 errdetail("Unicode low surrogate must follow a high "
+							   "surrogate.")));
+		ch = 0x10000 + *hi_surrogate + (ch & 0x3ff);
+		*hi_surrogate = -1;
+	}
+	else if (*hi_surrogate != -1)
+	{
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+				 errmsg("invalid input syntax for type jsonpath"),
+				 errdetail("Unicode low surrogate must follow a high "
+						   "surrogate.")));
+	}
+
+	addUnicodeChar(ch);
+}
+
+/*
+ * parseUnicode was adopted from json_lex_string() in
+ * src/backend/utils/adt/json.c
+ */
+static void
+parseUnicode(char *s, int l)
+{
+	int			i;
+	int			hi_surrogate = -1;
+
+	for (i = 2; i < l; i += 2)	/* skip '\u' */
+	{
+		int			ch = 0;
+		int			j;
+
+		if (s[i] == '{')	/* parse '\u{XX...}' */
+		{
+			while (s[++i] != '}' && i < l)
+				ch = (ch << 4) | hexval(s[i]);
+			i++;	/* ski p '}' */
+		}
+		else		/* parse '\uXXXX' */
+		{
+			for (j = 0; j < 4 && i < l; j++)
+				ch = (ch << 4) | hexval(s[i++]);
+		}
+
+		addUnicode(ch, &hi_surrogate);
+	}
+
+	if (hi_surrogate != -1)
+	{
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+				 errmsg("invalid input syntax for type jsonpath"),
+				 errdetail("Unicode low surrogate must follow a high "
+						   "surrogate.")));
+	}
+}
+
+static void
+parseHexChars(char *s, int l)
+{
+	int i;
+
+	Assert(l % 4 /* \xXX */ == 0);
+
+	for (i = 0; i < l / 4; i++)
+	{
+		int			ch = (hexval(s[i * 4 + 2]) << 4) | hexval(s[i * 4 + 3]);
+
+		addUnicodeChar(ch);
+	}
+}
+
+/*
+ * Interface functions to make flex use palloc() instead of malloc().
+ * It'd be better to make these static, but flex insists otherwise.
+ */
+
+void *
+jsonpath_yyalloc(yy_size_t bytes)
+{
+	return palloc(bytes);
+}
+
+void *
+jsonpath_yyrealloc(void *ptr, yy_size_t bytes)
+{
+	if (ptr)
+		return repalloc(ptr, bytes);
+	else
+		return palloc(bytes);
+}
+
+void
+jsonpath_yyfree(void *ptr)
+{
+	if (ptr)
+		pfree(ptr);
+}
+
diff --git a/src/backend/utils/adt/regexp.c b/src/backend/utils/adt/regexp.c
index 4ef8a92..da13a87 100644
--- a/src/backend/utils/adt/regexp.c
+++ b/src/backend/utils/adt/regexp.c
@@ -133,7 +133,7 @@ static Datum build_regexp_split_result(regexp_matches_ctx *splitctx);
  * Pattern is given in the database encoding.  We internally convert to
  * an array of pg_wchar, which is what Spencer's regex package wants.
  */
-static regex_t *
+regex_t *
 RE_compile_and_cache(text *text_re, int cflags, Oid collation)
 {
 	int			text_re_len = VARSIZE_ANY_EXHDR(text_re);
@@ -339,7 +339,7 @@ RE_execute(regex_t *re, char *dat, int dat_len,
  * Both pattern and data are given in the database encoding.  We internally
  * convert to array of pg_wchar which is what Spencer's regex package wants.
  */
-static bool
+bool
 RE_compile_and_execute(text *text_re, char *dat, int dat_len,
 					   int cflags, Oid collation,
 					   int nmatch, regmatch_t *pmatch)
diff --git a/src/backend/utils/errcodes.txt b/src/backend/utils/errcodes.txt
index 4f7b9b6..16f5ca2 100644
--- a/src/backend/utils/errcodes.txt
+++ b/src/backend/utils/errcodes.txt
@@ -206,6 +206,21 @@ Section: Class 22 - Data Exception
 2200N    E    ERRCODE_INVALID_XML_CONTENT                                    invalid_xml_content
 2200S    E    ERRCODE_INVALID_XML_COMMENT                                    invalid_xml_comment
 2200T    E    ERRCODE_INVALID_XML_PROCESSING_INSTRUCTION                     invalid_xml_processing_instruction
+22030    E    ERRCODE_DUPLICATE_JSON_OBJECT_KEY_VALUE                        duplicate_json_object_key_value
+22032    E    ERRCODE_INVALID_JSON_TEXT                                      invalid_json_text
+22033    E    ERRCODE_INVALID_JSON_SUBSCRIPT                                 invalid_json_subscript
+22034    E    ERRCODE_MORE_THAN_ONE_JSON_ITEM                                more_than_one_json_item
+22035    E    ERRCODE_NO_JSON_ITEM                                           no_json_item
+22036    E    ERRCODE_NON_NUMERIC_JSON_ITEM                                  non_numeric_json_item
+22037    E    ERRCODE_NON_UNIQUE_KEYS_IN_JSON_OBJECT                         non_unique_keys_in_json_object
+22038    E    ERRCODE_SINGLETON_JSON_ITEM_REQUIRED                           singleton_json_item_required
+22039    E    ERRCODE_JSON_ARRAY_NOT_FOUND                                   json_array_not_found
+2203A    E    ERRCODE_JSON_MEMBER_NOT_FOUND                                  json_member_not_found
+2203B    E    ERRCODE_JSON_NUMBER_NOT_FOUND                                  json_number_not_found
+2203C    E    ERRCODE_JSON_OBJECT_NOT_FOUND                                  object_not_found
+2203F    E    ERRCODE_JSON_SCALAR_REQUIRED                                   json_scalar_required
+2203D    E    ERRCODE_TOO_MANY_JSON_ARRAY_ELEMENTS                           too_many_json_array_elements
+2203E    E    ERRCODE_TOO_MANY_JSON_OBJECT_MEMBERS                           too_many_json_object_members
 
 Section: Class 23 - Integrity Constraint Violation
 
diff --git a/src/include/catalog/pg_operator.dat b/src/include/catalog/pg_operator.dat
index 06aec07..1c7af92 100644
--- a/src/include/catalog/pg_operator.dat
+++ b/src/include/catalog/pg_operator.dat
@@ -3255,5 +3255,13 @@
 { oid => '3287', descr => 'delete path',
   oprname => '#-', oprleft => 'jsonb', oprright => '_text',
   oprresult => 'jsonb', oprcode => 'jsonb_delete_path' },
+{ oid => '6076', descr => 'jsonpath exists',
+  oprname => '@?', oprleft => 'jsonb', oprright => 'jsonpath',
+  oprresult => 'bool', oprcode => 'jsonb_path_exists(jsonb,jsonpath)',
+  oprrest => 'contsel', oprjoin => 'contjoinsel' },
+{ oid => '6107', descr => 'jsonpath match',
+  oprname => '@@', oprleft => 'jsonb', oprright => 'jsonpath',
+  oprresult => 'bool', oprcode => 'jsonb_path_match(jsonb,jsonpath)',
+  oprrest => 'contsel', oprjoin => 'contjoinsel' },
 
 ]
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index a4e173b..9a7a5db 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -9185,6 +9185,45 @@
   proname => 'jsonb_insert', prorettype => 'jsonb',
   proargtypes => 'jsonb _text jsonb bool', prosrc => 'jsonb_insert' },
 
+# jsonpath
+{ oid => '6048', descr => 'I/O',
+  proname => 'jsonpath_in', prorettype => 'jsonpath', proargtypes => 'cstring',
+  prosrc => 'jsonpath_in' },
+{ oid => '6049', descr => 'I/O',
+  proname => 'jsonpath_recv', prorettype => 'jsonpath', proargtypes => 'internal',
+  prosrc => 'jsonpath_recv' },
+{ oid => '6052', descr => 'I/O',
+  proname => 'jsonpath_out', prorettype => 'cstring', proargtypes => 'jsonpath',
+  prosrc => 'jsonpath_out' },
+{ oid => '6053', descr => 'I/O',
+  proname => 'jsonpath_send', prorettype => 'bytea', proargtypes => 'jsonpath',
+  prosrc => 'jsonpath_send' },
+
+{ oid => '6054', descr => 'jsonpath exists test',
+  proname => 'jsonb_path_exists', prorettype => 'bool',
+  proargtypes => 'jsonb jsonpath jsonb bool', prosrc => 'jsonb_path_exists' },
+{ oid => '6055', descr => 'jsonpath query',
+  proname => 'jsonb_path_query', prorows => '1000', proretset => 't',
+  prorettype => 'jsonb', proargtypes => 'jsonb jsonpath jsonb bool',
+  prosrc => 'jsonb_path_query' },
+{ oid => '6056', descr => 'jsonpath query wrapped into array',
+  proname => 'jsonb_path_query_array', prorettype => 'jsonb',
+  proargtypes => 'jsonb jsonpath jsonb bool',
+  prosrc => 'jsonb_path_query_array' },
+{ oid => '6057', descr => 'jsonpath query first item',
+  proname => 'jsonb_path_query_first', prorettype => 'jsonb',
+  proargtypes => 'jsonb jsonpath jsonb bool', prosrc => 'jsonb_path_query_first' },
+{ oid => '6058', descr => 'jsonpath match', proname => 'jsonb_path_match',
+  prorettype => 'bool', proargtypes => 'jsonb jsonpath jsonb bool',
+  prosrc => 'jsonb_path_match' },
+
+{ oid => '6059', descr => 'implementation of @? operator',
+  proname => 'jsonb_path_exists', prorettype => 'bool',
+  proargtypes => 'jsonb jsonpath', prosrc => 'jsonb_path_exists_opr' },
+{ oid => '6060', descr => 'implementation of @@ operator',
+  proname => 'jsonb_path_match', prorettype => 'bool',
+  proargtypes => 'jsonb jsonpath', prosrc => 'jsonb_path_match_opr' },
+
 # txid
 { oid => '2939', descr => 'I/O',
   proname => 'txid_snapshot_in', prorettype => 'txid_snapshot',
diff --git a/src/include/catalog/pg_type.dat b/src/include/catalog/pg_type.dat
index 4b7750d..e44c562 100644
--- a/src/include/catalog/pg_type.dat
+++ b/src/include/catalog/pg_type.dat
@@ -441,6 +441,11 @@
   typname => 'jsonb', typlen => '-1', typbyval => 'f', typcategory => 'U',
   typinput => 'jsonb_in', typoutput => 'jsonb_out', typreceive => 'jsonb_recv',
   typsend => 'jsonb_send', typalign => 'i', typstorage => 'x' },
+{ oid =>  '6050', array_type_oid => '6051', descr => 'JSON path',
+  typname => 'jsonpath', typlen => '-1', typbyval => 'f', typcategory => 'U',
+  typarray => '_jsonpath', typinput => 'jsonpath_in',
+  typoutput => 'jsonpath_out', typreceive => '-', typsend => '-',
+  typalign => 'i', typstorage => 'x' },
 
 { oid => '2970', array_type_oid => '2949', descr => 'txid snapshot',
   typname => 'txid_snapshot', typlen => '-1', typbyval => 'f',
diff --git a/src/include/regex/regex.h b/src/include/regex/regex.h
index 27fdc09..23ad03d 100644
--- a/src/include/regex/regex.h
+++ b/src/include/regex/regex.h
@@ -167,10 +167,18 @@ typedef struct
 /*
  * the prototypes for exported functions
  */
+
+/* regcomp.c */
 extern int	pg_regcomp(regex_t *, const pg_wchar *, size_t, int, Oid);
 extern int	pg_regexec(regex_t *, const pg_wchar *, size_t, size_t, rm_detail_t *, size_t, regmatch_t[], int);
 extern int	pg_regprefix(regex_t *, pg_wchar **, size_t *);
 extern void pg_regfree(regex_t *);
 extern size_t pg_regerror(int, const regex_t *, char *, size_t);
 
+/* regexp.c */
+extern regex_t *RE_compile_and_cache(text *text_re, int cflags, Oid collation);
+extern bool RE_compile_and_execute(text *text_re, char *dat, int dat_len,
+					   int cflags, Oid collation,
+					   int nmatch, regmatch_t *pmatch);
+
 #endif							/* _REGEX_H_ */
diff --git a/src/include/utils/.gitignore b/src/include/utils/.gitignore
index 05cfa7a..e0705e1 100644
--- a/src/include/utils/.gitignore
+++ b/src/include/utils/.gitignore
@@ -3,3 +3,4 @@
 /probes.h
 /errcodes.h
 /header-stamp
+/jsonpath_gram.h
diff --git a/src/include/utils/jsonb.h b/src/include/utils/jsonb.h
index 6ccacf5..ec0355f 100644
--- a/src/include/utils/jsonb.h
+++ b/src/include/utils/jsonb.h
@@ -66,8 +66,10 @@ typedef enum
 
 /* Convenience macros */
 #define DatumGetJsonbP(d)	((Jsonb *) PG_DETOAST_DATUM(d))
+#define DatumGetJsonbPCopy(d)	((Jsonb *) PG_DETOAST_DATUM_COPY(d))
 #define JsonbPGetDatum(p)	PointerGetDatum(p)
 #define PG_GETARG_JSONB_P(x)	DatumGetJsonbP(PG_GETARG_DATUM(x))
+#define PG_GETARG_JSONB_P_COPY(x)	DatumGetJsonbPCopy(PG_GETARG_DATUM(x))
 #define PG_RETURN_JSONB_P(x)	PG_RETURN_POINTER(x)
 
 typedef struct JsonbPair JsonbPair;
@@ -378,6 +380,8 @@ extern char *JsonbToCString(StringInfo out, JsonbContainer *in,
 			   int estimated_len);
 extern char *JsonbToCStringIndent(StringInfo out, JsonbContainer *in,
 					 int estimated_len);
+extern bool JsonbExtractScalar(JsonbContainer *jbc, JsonbValue *res);
+extern const char *JsonbTypeName(JsonbValue *jb);

 #endif							/* __JSONB_H__ */
diff --git a/src/include/utils/jsonpath.h b/src/include/utils/jsonpath.h
new file mode 100644
index 0000000..14f837e
--- /dev/null
+++ b/src/include/utils/jsonpath.h
@@ -0,0 +1,245 @@
+/*-------------------------------------------------------------------------
+ *
+ * jsonpath.h
+ *	Definitions for jsonpath datatype
+ *
+ * Copyright (c) 2019, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	src/include/utils/jsonpath.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef JSONPATH_H
+#define JSONPATH_H
+
+#include "fmgr.h"
+#include "utils/jsonb.h"
+#include "nodes/pg_list.h"
+
+typedef struct
+{
+	int32		vl_len_;		/* varlena header (do not touch directly!) */
+	uint32		header;			/* version and flags (see below) */
+	char		data[FLEXIBLE_ARRAY_MEMBER];
+} JsonPath;
+
+#define JSONPATH_VERSION	(0x01)
+#define JSONPATH_LAX		(0x80000000)
+#define JSONPATH_HDRSZ		(offsetof(JsonPath, data))
+
+#define DatumGetJsonPathP(d)			((JsonPath *) DatumGetPointer(PG_DETOAST_DATUM(d)))
+#define DatumGetJsonPathPCopy(d)		((JsonPath *) DatumGetPointer(PG_DETOAST_DATUM_COPY(d)))
+#define PG_GETARG_JSONPATH_P(x)			DatumGetJsonPathP(PG_GETARG_DATUM(x))
+#define PG_GETARG_JSONPATH_P_COPY(x)	DatumGetJsonPathPCopy(PG_GETARG_DATUM(x))
+#define PG_RETURN_JSONPATH_P(p)			PG_RETURN_POINTER(p)
+
+/*
+ * All node's type of jsonpath expression
+ */
+typedef enum JsonPathItemType
+{
+	jpiNull = jbvNull,			/* NULL literal */
+	jpiString = jbvString,		/* string literal */
+	jpiNumeric = jbvNumeric,	/* numeric literal */
+	jpiBool = jbvBool,			/* boolean literal: TRUE or FALSE */
+	jpiAnd,						/* predicate && predicate */
+	jpiOr,						/* predicate || predicate */
+	jpiNot,						/* ! predicate */
+	jpiIsUnknown,				/* (predicate) IS UNKNOWN */
+	jpiEqual,					/* expr == expr */
+	jpiNotEqual,				/* expr != expr */
+	jpiLess,					/* expr < expr */
+	jpiGreater,					/* expr > expr */
+	jpiLessOrEqual,				/* expr <= expr */
+	jpiGreaterOrEqual,			/* expr >= expr */
+	jpiAdd,						/* expr + expr */
+	jpiSub,						/* expr - expr */
+	jpiMul,						/* expr * expr */
+	jpiDiv,						/* expr / expr */
+	jpiMod,						/* expr % expr */
+	jpiPlus,					/* + expr */
+	jpiMinus,					/* - expr */
+	jpiAnyArray,				/* [*] */
+	jpiAnyKey,					/* .* */
+	jpiIndexArray,				/* [subscript, ...] */
+	jpiAny,						/* .** */
+	jpiKey,						/* .key */
+	jpiCurrent,					/* @ */
+	jpiRoot,					/* $ */
+	jpiVariable,				/* $variable */
+	jpiFilter,					/* ? (predicate) */
+	jpiExists,					/* EXISTS (expr) predicate */
+	jpiType,					/* .type() item method */
+	jpiSize,					/* .size() item method */
+	jpiAbs,						/* .abs() item method */
+	jpiFloor,					/* .floor() item method */
+	jpiCeiling,					/* .ceiling() item method */
+	jpiDouble,					/* .double() item method */
+	jpiKeyValue,				/* .keyvalue() item method */
+	jpiSubscript,				/* array subscript: 'expr' or 'expr TO expr' */
+	jpiLast,					/* LAST array subscript */
+	jpiStartsWith,				/* STARTS WITH predicate */
+	jpiLikeRegex,				/* LIKE_REGEX predicate */
+} JsonPathItemType;
+
+/* XQuery regex mode flags for LIKE_REGEX predicate */
+#define JSP_REGEX_ICASE		0x01	/* i flag, case insensitive */
+#define JSP_REGEX_SLINE		0x02	/* s flag, single-line mode */
+#define JSP_REGEX_MLINE		0x04	/* m flag, multi-line mode */
+#define JSP_REGEX_WSPACE	0x08	/* x flag, expanded syntax */
+
+/*
+ * Support functions to parse/construct binary value.
+ * Unlike many other representation of expression the first/main
+ * node is not an operation but left operand of expression. That
+ * allows to implement cheep follow-path descending in jsonb
+ * structure and then execute operator with right operand
+ */
+
+typedef struct JsonPathItem
+{
+	JsonPathItemType type;
+
+	/* position form base to next node */
+	int32		nextPos;
+
+	/*
+	 * pointer into JsonPath value to current node, all positions of current
+	 * are relative to this base
+	 */
+	char	   *base;
+
+	union
+	{
+		/* classic operator with two operands: and, or etc */
+		struct
+		{
+			int32		left;
+			int32		right;
+		}			args;
+
+		/* any unary operation */
+		int32		arg;
+
+		/* storage for jpiIndexArray: indexes of array */
+		struct
+		{
+			int32		nelems;
+			struct
+			{
+				int32		from;
+				int32		to;
+			}		   *elems;
+		}			array;
+
+		/* jpiAny: levels */
+		struct
+		{
+			uint32		first;
+			uint32		last;
+		}			anybounds;
+
+		struct
+		{
+			char	   *data;	/* for bool, numeric and string/key */
+			int32		datalen;	/* filled only for string/key */
+		}			value;
+
+		struct
+		{
+			int32		expr;
+			char	   *pattern;
+			int32		patternlen;
+			uint32		flags;
+		}			like_regex;
+	}			content;
+} JsonPathItem;
+
+#define jspHasNext(jsp) ((jsp)->nextPos > 0)
+
+extern void jspInit(JsonPathItem *v, JsonPath *js);
+extern void jspInitByBuffer(JsonPathItem *v, char *base, int32 pos);
+extern bool jspGetNext(JsonPathItem *v, JsonPathItem *a);
+extern void jspGetArg(JsonPathItem *v, JsonPathItem *a);
+extern void jspGetLeftArg(JsonPathItem *v, JsonPathItem *a);
+extern void jspGetRightArg(JsonPathItem *v, JsonPathItem *a);
+extern Numeric jspGetNumeric(JsonPathItem *v);
+extern bool jspGetBool(JsonPathItem *v);
+extern char *jspGetString(JsonPathItem *v, int32 *len);
+extern bool jspGetArraySubscript(JsonPathItem *v, JsonPathItem *from,
+					 JsonPathItem *to, int i);
+
+extern const char *jspOperationName(JsonPathItemType type);
+
+/*
+ * Parsing support data structures.
+ */
+
+typedef struct JsonPathParseItem JsonPathParseItem;
+
+struct JsonPathParseItem
+{
+	JsonPathItemType type;
+	JsonPathParseItem *next;	/* next in path */
+
+	union
+	{
+
+		/* classic operator with two operands: and, or etc */
+		struct
+		{
+			JsonPathParseItem *left;
+			JsonPathParseItem *right;
+		}			args;
+
+		/* any unary operation */
+		JsonPathParseItem *arg;
+
+		/* storage for jpiIndexArray: indexes of array */
+		struct
+		{
+			int			nelems;
+			struct
+			{
+				JsonPathParseItem *from;
+				JsonPathParseItem *to;
+			}		   *elems;
+		}			array;
+
+		/* jpiAny: levels */
+		struct
+		{
+			uint32		first;
+			uint32		last;
+		}			anybounds;
+
+		struct
+		{
+			JsonPathParseItem *expr;
+			char	   *pattern;	/* could not be not null-terminated */
+			uint32		patternlen;
+			uint32		flags;
+		}			like_regex;
+
+		/* scalars */
+		Numeric numeric;
+		bool		boolean;
+		struct
+		{
+			uint32		len;
+			char	   *val;	/* could not be not null-terminated */
+		}			string;
+	}			value;
+};
+
+typedef struct JsonPathParseResult
+{
+	JsonPathParseItem *expr;
+	bool		lax;
+} JsonPathParseResult;
+
+extern JsonPathParseResult *parsejsonpath(const char *str, int len);
+
+#endif
diff --git a/src/include/utils/jsonpath_scanner.h b/src/include/utils/jsonpath_scanner.h
new file mode 100644
index 0000000..bbdd984
--- /dev/null
+++ b/src/include/utils/jsonpath_scanner.h
@@ -0,0 +1,32 @@
+/*-------------------------------------------------------------------------
+ *
+ * jsonpath_scanner.h
+ *	Definitions for jsonpath scanner & parser
+ *
+ * Portions Copyright (c) 2019, PostgreSQL Global Development Group
+ *
+ * src/include/utils/jsonpath_scanner.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef JSONPATH_SCANNER_H
+#define JSONPATH_SCANNER_H
+
+/* struct string is shared between scan and gram */
+typedef struct string
+{
+	char	   *val;
+	int			len;
+	int			total;
+}			string;
+
+#include "utils/jsonpath.h"
+#include "utils/jsonpath_gram.h"
+
+/* flex 2.5.4 doesn't bother with a decl for this */
+extern int	jsonpath_yylex(YYSTYPE *yylval_param);
+extern int	jsonpath_yyparse(JsonPathParseResult **result);
+extern void jsonpath_yyerror(JsonPathParseResult **result, const char *message);
+
+#endif
diff --git a/src/test/regress/expected/jsonb_jsonpath.out b/src/test/regress/expected/jsonb_jsonpath.out
new file mode 100644
index 0000000..f295b92
--- /dev/null
+++ b/src/test/regress/expected/jsonb_jsonpath.out
@@ -0,0 +1,1564 @@
+select jsonb '{"a": 12}' @? '$';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": 12}' @? '1';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": 12}' @? '$.a.b';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"a": 12}' @? '$.b';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"a": 12}' @? '$.a + 2';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": 12}' @? '$.b + 2';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '{"a": {"a": 12}}' @? '$.a.a';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"a": 12}}' @? '$.*.a';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"b": {"a": 12}}' @? '$.*.a';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"b": {"a": 12}}' @? '$.*.b';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"b": {"a": 12}}' @? 'strict $.*.b';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '{}' @? '$.*';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"a": 1}' @? '$.*';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? 'lax $.**{1}';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? 'lax $.**{2}';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? 'lax $.**{3}';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '[]' @? '$[*]';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '[1]' @? '$[*]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1]' @? '$[1]';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '[1]' @? 'strict $[1]';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb_path_query('[1]', 'strict $[1]');
+ERROR:  invalid SQL/JSON subscript
+DETAIL:  jsonpath array subscript is out of bounds
+select jsonb '[1]' @? 'lax $[10000000000000000]';
+ERROR:  integer out of range
+select jsonb '[1]' @? 'strict $[10000000000000000]';
+ERROR:  integer out of range
+select jsonb_path_query('[1]', 'lax $[10000000000000000]');
+ERROR:  integer out of range
+select jsonb_path_query('[1]', 'strict $[10000000000000000]');
+ERROR:  integer out of range
+select jsonb '[1]' @? '$[0]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1]' @? '$[0.3]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1]' @? '$[0.5]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1]' @? '$[0.9]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1]' @? '$[1.2]';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '[1]' @? 'strict $[1.2]';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '{"a": [1,2,3], "b": [3,4,5]}' @? '$ ? (@.a[*] >  @.b[*])';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"a": [1,2,3], "b": [3,4,5]}' @? '$ ? (@.a[*] >= @.b[*])';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": [1,2,3], "b": [3,4,"5"]}' @? '$ ? (@.a[*] >= @.b[*])';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": [1,2,3], "b": [3,4,"5"]}' @? 'strict $ ? (@.a[*] >= @.b[*])';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"a": [1,2,3], "b": [3,4,null]}' @? '$ ? (@.a[*] >= @.b[*])';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '1' @? '$ ? ((@ == "1") is unknown)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '1' @? '$ ? ((@ == 1) is unknown)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '[{"a": 1}, {"a": 2}]' @? '$[0 to 1] ? (@.a > 1)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb_path_query('1', 'lax $.a');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('1', 'strict $.a');
+ERROR:  SQL/JSON member not found
+DETAIL:  jsonpath member accessor is applied to not an object
+select jsonb_path_query('1', 'strict $.*');
+ERROR:  SQL/JSON object not found
+DETAIL:  jsonpath wildcard member accessor is applied to not an object
+select jsonb_path_query('[]', 'lax $.a');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[]', 'strict $.a');
+ERROR:  SQL/JSON member not found
+DETAIL:  jsonpath member accessor is applied to not an object
+select jsonb_path_query('{}', 'lax $.a');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{}', 'strict $.a');
+ERROR:  SQL/JSON member not found
+DETAIL:  JSON object does not contain key "a"
+select jsonb_path_query('1', 'strict $[1]');
+ERROR:  SQL/JSON array not found
+DETAIL:  jsonpath array accessor is applied to not an array
+select jsonb_path_query('1', 'strict $[*]');
+ERROR:  SQL/JSON array not found
+DETAIL:  jsonpath wildcard array accessor is applied to not an array
+select jsonb_path_query('[]', 'strict $[1]');
+ERROR:  invalid SQL/JSON subscript
+DETAIL:  jsonpath array subscript is out of bounds
+select jsonb_path_query('[]', 'strict $["a"]');
+ERROR:  invalid SQL/JSON subscript
+DETAIL:  jsonpath array subscript is not a singleton numeric value
+select jsonb_path_query('{"a": 12, "b": {"a": 13}}', '$.a');
+ jsonb_path_query 
+------------------
+ 12
+(1 row)
+
+select jsonb_path_query('{"a": 12, "b": {"a": 13}}', '$.b');
+ jsonb_path_query 
+------------------
+ {"a": 13}
+(1 row)
+
+select jsonb_path_query('{"a": 12, "b": {"a": 13}}', '$.*');
+ jsonb_path_query 
+------------------
+ 12
+ {"a": 13}
+(2 rows)
+
+select jsonb_path_query('{"a": 12, "b": {"a": 13}}', 'lax $.*.a');
+ jsonb_path_query 
+------------------
+ 13
+(1 row)
+
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[*].a');
+ jsonb_path_query 
+------------------
+ 13
+(1 row)
+
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[*].*');
+ jsonb_path_query 
+------------------
+ 13
+ 14
+(2 rows)
+
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[0].a');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[1].a');
+ jsonb_path_query 
+------------------
+ 13
+(1 row)
+
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[2].a');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[0,1].a');
+ jsonb_path_query 
+------------------
+ 13
+(1 row)
+
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[0 to 10].a');
+ jsonb_path_query 
+------------------
+ 13
+(1 row)
+
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[0 to 10 / 0].a');
+ERROR:  division by zero
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}, "ccc", true]', '$[2.5 - 1 to $.size() - 2]');
+ jsonb_path_query 
+------------------
+ {"a": 13}
+ {"b": 14}
+ "ccc"
+(3 rows)
+
+select jsonb_path_query('1', 'lax $[0]');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('1', 'lax $[*]');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('[1]', 'lax $[0]');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('[1]', 'lax $[*]');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('[1,2,3]', 'lax $[*]');
+ jsonb_path_query 
+------------------
+ 1
+ 2
+ 3
+(3 rows)
+
+select jsonb_path_query('[1,2,3]', 'strict $[*].a');
+ERROR:  SQL/JSON member not found
+DETAIL:  jsonpath member accessor is applied to not an object
+select jsonb_path_query('[]', '$[last]');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[]', '$[last ? (exists(last))]');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[]', 'strict $[last]');
+ERROR:  invalid SQL/JSON subscript
+DETAIL:  jsonpath array subscript is out of bounds
+select jsonb_path_query('[1]', '$[last]');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('[1,2,3]', '$[last]');
+ jsonb_path_query 
+------------------
+ 3
+(1 row)
+
+select jsonb_path_query('[1,2,3]', '$[last - 1]');
+ jsonb_path_query 
+------------------
+ 2
+(1 row)
+
+select jsonb_path_query('[1,2,3]', '$[last ? (@.type() == "number")]');
+ jsonb_path_query 
+------------------
+ 3
+(1 row)
+
+select jsonb_path_query('[1,2,3]', '$[last ? (@.type() == "string")]');
+ERROR:  invalid SQL/JSON subscript
+DETAIL:  jsonpath array subscript is not a singleton numeric value
+select * from jsonb_path_query('{"a": 10}', '$');
+ jsonb_path_query 
+------------------
+ {"a": 10}
+(1 row)
+
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)');
+ERROR:  cannot find jsonpath variable 'value'
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)', '1');
+ERROR:  jsonb containing jsonpath variables is not an object
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)', '[{"value" : 13}]');
+ERROR:  jsonb containing jsonpath variables is not an object
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)', '{"value" : 13}');
+ jsonb_path_query 
+------------------
+ {"a": 10}
+(1 row)
+
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)', '{"value" : 8}');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select * from jsonb_path_query('{"a": 10}', '$.a ? (@ < $value)', '{"value" : 13}');
+ jsonb_path_query 
+------------------
+ 10
+(1 row)
+
+select * from jsonb_path_query('[10,11,12,13,14,15]', '$[*] ? (@ < $value)', '{"value" : 13}');
+ jsonb_path_query 
+------------------
+ 10
+ 11
+ 12
+(3 rows)
+
+select * from jsonb_path_query('[10,11,12,13,14,15]', '$[0,1] ? (@ < $x.value)', '{"x": {"value" : 13}}');
+ jsonb_path_query 
+------------------
+ 10
+ 11
+(2 rows)
+
+select * from jsonb_path_query('[10,11,12,13,14,15]', '$[0 to 2] ? (@ < $value)', '{"value" : 15}');
+ jsonb_path_query 
+------------------
+ 10
+ 11
+ 12
+(3 rows)
+
+select * from jsonb_path_query('[1,"1",2,"2",null]', '$[*] ? (@ == "1")');
+ jsonb_path_query 
+------------------
+ "1"
+(1 row)
+
+select * from jsonb_path_query('[1,"1",2,"2",null]', '$[*] ? (@ == $value)', '{"value" : "1"}');
+ jsonb_path_query 
+------------------
+ "1"
+(1 row)
+
+select * from jsonb_path_query('[1,"1",2,"2",null]', '$[*] ? (@ == $value)', '{"value" : null}');
+ jsonb_path_query 
+------------------
+ null
+(1 row)
+
+select * from jsonb_path_query('[1, "2", null]', '$[*] ? (@ != null)');
+ jsonb_path_query 
+------------------
+ 1
+ "2"
+(2 rows)
+
+select * from jsonb_path_query('[1, "2", null]', '$[*] ? (@ == null)');
+ jsonb_path_query 
+------------------
+ null
+(1 row)
+
+select * from jsonb_path_query('{}', '$ ? (@ == @)');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select * from jsonb_path_query('[]', 'strict $ ? (@ == @)');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**');
+ jsonb_path_query 
+------------------
+ {"a": {"b": 1}}
+ {"b": 1}
+ 1
+(3 rows)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{0}');
+ jsonb_path_query 
+------------------
+ {"a": {"b": 1}}
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{0 to last}');
+ jsonb_path_query 
+------------------
+ {"a": {"b": 1}}
+ {"b": 1}
+ 1
+(3 rows)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1}');
+ jsonb_path_query 
+------------------
+ {"b": 1}
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1 to last}');
+ jsonb_path_query 
+------------------
+ {"b": 1}
+ 1
+(2 rows)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{2}');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{2 to last}');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{3 to last}');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{last}');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{0}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{0 to last}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1 to last}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1 to 2}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{0}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{1}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{0 to last}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{1 to last}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{1 to 2}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{2 to 3}.b ? (@ > 0)');
+ jsonb_path_query 
+------------------
+ 1
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? '$.**.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? '$.**{0}.b ? ( @ > 0)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? '$.**{1}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? '$.**{0 to last}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? '$.**{1 to last}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"b": 1}}' @? '$.**{1 to 2}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{0}.b ? ( @ > 0)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{1}.b ? ( @ > 0)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{0 to last}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{1 to last}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{1 to 2}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{2 to 3}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb_path_query('{"g": {"x": 2}}', '$.g ? (exists (@.x))');
+ jsonb_path_query 
+------------------
+ {"x": 2}
+(1 row)
+
+select jsonb_path_query('{"g": {"x": 2}}', '$.g ? (exists (@.y))');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"g": {"x": 2}}', '$.g ? (exists (@.x ? (@ >= 2) ))');
+ jsonb_path_query 
+------------------
+ {"x": 2}
+(1 row)
+
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'lax $.g ? (exists (@.x))');
+ jsonb_path_query 
+------------------
+ {"x": 2}
+(1 row)
+
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'lax $.g ? (exists (@.x + "3"))');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'lax $.g ? ((exists (@.x + "3")) is unknown)');
+ jsonb_path_query 
+------------------
+ {"x": 2}
+ {"y": 3}
+(2 rows)
+
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'strict $.g[*] ? (exists (@.x))');
+ jsonb_path_query 
+------------------
+ {"x": 2}
+(1 row)
+
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'strict $.g[*] ? ((exists (@.x)) is unknown)');
+ jsonb_path_query 
+------------------
+ {"y": 3}
+(1 row)
+
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'strict $.g ? (exists (@[*].x))');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'strict $.g ? ((exists (@[*].x)) is unknown)');
+   jsonb_path_query   
+----------------------
+ [{"x": 2}, {"y": 3}]
+(1 row)
+
+--test ternary logic
+select
+	x, y,
+	jsonb_path_query(
+		'[true, false, null]',
+		'$[*] ? (@ == true  &&  ($x == true && $y == true) ||
+				 @ == false && !($x == true && $y == true) ||
+				 @ == null  &&  ($x == true && $y == true) is unknown)',
+		jsonb_build_object('x', x, 'y', y)
+	) as "x && y"
+from
+	(values (jsonb 'true'), ('false'), ('"null"')) x(x),
+	(values (jsonb 'true'), ('false'), ('"null"')) y(y);
+   x    |   y    | x && y 
+--------+--------+--------
+ true   | true   | true
+ true   | false  | false
+ true   | "null" | null
+ false  | true   | false
+ false  | false  | false
+ false  | "null" | false
+ "null" | true   | null
+ "null" | false  | false
+ "null" | "null" | null
+(9 rows)
+
+select
+	x, y,
+	jsonb_path_query(
+		'[true, false, null]',
+		'$[*] ? (@ == true  &&  ($x == true || $y == true) ||
+				 @ == false && !($x == true || $y == true) ||
+				 @ == null  &&  ($x == true || $y == true) is unknown)',
+		jsonb_build_object('x', x, 'y', y)
+	) as "x || y"
+from
+	(values (jsonb 'true'), ('false'), ('"null"')) x(x),
+	(values (jsonb 'true'), ('false'), ('"null"')) y(y);
+   x    |   y    | x || y 
+--------+--------+--------
+ true   | true   | true
+ true   | false  | true
+ true   | "null" | true
+ false  | true   | true
+ false  | false  | false
+ false  | "null" | null
+ "null" | true   | true
+ "null" | false  | null
+ "null" | "null" | null
+(9 rows)
+
+select jsonb '{"a": 1, "b":1}' @? '$ ? (@.a == @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$ ? (@.a == @.b)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$.c ? (@.a == @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$.c ? ($.c.a == @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$.* ? (@.a == @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": 1, "b":1}' @? '$.** ? (@.a == @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$.** ? (@.a == @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb_path_query('{"c": {"a": 2, "b":1}}', '$.** ? (@.a == 1 + 1)');
+ jsonb_path_query 
+------------------
+ {"a": 2, "b": 1}
+(1 row)
+
+select jsonb_path_query('{"c": {"a": 2, "b":1}}', '$.** ? (@.a == (1 + 1))');
+ jsonb_path_query 
+------------------
+ {"a": 2, "b": 1}
+(1 row)
+
+select jsonb_path_query('{"c": {"a": 2, "b":1}}', '$.** ? (@.a == @.b + 1)');
+ jsonb_path_query 
+------------------
+ {"a": 2, "b": 1}
+(1 row)
+
+select jsonb_path_query('{"c": {"a": 2, "b":1}}', '$.** ? (@.a == (@.b + 1))');
+ jsonb_path_query 
+------------------
+ {"a": 2, "b": 1}
+(1 row)
+
+select jsonb '{"c": {"a": -1, "b":1}}' @? '$.** ? (@.a == - 1)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": -1, "b":1}}' @? '$.** ? (@.a == -1)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": -1, "b":1}}' @? '$.** ? (@.a == -@.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": -1, "b":1}}' @? '$.** ? (@.a == - @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": 0, "b":1}}' @? '$.** ? (@.a == 1 - @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": 2, "b":1}}' @? '$.** ? (@.a == 1 - - @.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"c": {"a": 0, "b":1}}' @? '$.** ? (@.a == 1 - +@.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1,2,3]' @? '$ ? (+@[*] > +2)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1,2,3]' @? '$ ? (+@[*] > +3)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '[1,2,3]' @? '$ ? (-@[*] < -2)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1,2,3]' @? '$ ? (-@[*] < -3)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '1' @? '$ ? ($ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+-- arithmetic errors
+select jsonb_path_query('[1,2,0,3]', '$[*] ? (2 / @ > 0)');
+ERROR:  division by zero
+select jsonb_path_query('[1,2,0,3]', '$[*] ? ((2 / @ > 0) is unknown)');
+ERROR:  division by zero
+select jsonb_path_query('0', '1 / $');
+ERROR:  division by zero
+select jsonb_path_query('0', '1 / $ + 2');
+ERROR:  division by zero
+select jsonb_path_query('0', '-(3 + 1 % $)');
+ERROR:  division by zero
+select jsonb_path_query('1', '$ + "2"');
+ERROR:  singleton SQL/JSON item required
+DETAIL:  right operand of binary jsonpath operator + is not a singleton numeric value
+select jsonb_path_query('[1, 2]', '3 * $');
+ERROR:  singleton SQL/JSON item required
+DETAIL:  right operand of binary jsonpath operator * is not a singleton numeric value
+select jsonb_path_query('"a"', '-$');
+ERROR:  SQL/JSON number not found
+DETAIL:  operand of unary jsonpath operator - is not a numeric value
+select jsonb_path_query('[1,"2",3]', '+$');
+ERROR:  SQL/JSON number not found
+DETAIL:  operand of unary jsonpath operator + is not a numeric value
+select jsonb '["1",2,0,3]' @? '-$[*]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '[1,"2",0,3]' @? '-$[*]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '["1",2,0,3]' @? 'strict -$[*]';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '[1,"2",0,3]' @? 'strict -$[*]';
+ ?column? 
+----------
+ 
+(1 row)
+
+-- unwrapping of operator arguments in lax mode
+select jsonb_path_query('{"a": [2]}', 'lax $.a * 3');
+ jsonb_path_query 
+------------------
+ 6
+(1 row)
+
+select jsonb_path_query('{"a": [2]}', 'lax $.a + 3');
+ jsonb_path_query 
+------------------
+ 5
+(1 row)
+
+select jsonb_path_query('{"a": [2, 3, 4]}', 'lax -$.a');
+ jsonb_path_query 
+------------------
+ -2
+ -3
+ -4
+(3 rows)
+
+-- should fail
+select jsonb_path_query('{"a": [1, 2]}', 'lax $.a * 3');
+ERROR:  singleton SQL/JSON item required
+DETAIL:  left operand of binary jsonpath operator * is not a singleton numeric value
+-- extension: boolean expressions
+select jsonb_path_query('2', '$ > 1');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('2', '$ <= 1');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('2', '$ == "2"');
+ jsonb_path_query 
+------------------
+ null
+(1 row)
+
+select jsonb '2' @? '$ == "2"';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '2' @@ '$ > 1';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '2' @@ '$ <= 1';
+ ?column? 
+----------
+ f
+(1 row)
+
+select jsonb '2' @@ '$ == "2"';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '2' @@ '1';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '{}' @@ '$';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '[]' @@ '$';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '[1,2,3]' @@ '$[*]';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb '[]' @@ '$[*]';
+ ?column? 
+----------
+ 
+(1 row)
+
+select jsonb_path_match('[[1, true], [2, false]]', 'strict $[*] ? (@[0] > $x) [1]', '{"x": 1}');
+ jsonb_path_match 
+------------------
+ f
+(1 row)
+
+select jsonb_path_match('[[1, true], [2, false]]', 'strict $[*] ? (@[0] < $x) [1]', '{"x": 2}');
+ jsonb_path_match 
+------------------
+ t
+(1 row)
+
+select jsonb_path_query('[null,1,true,"a",[],{}]', '$.type()');
+ jsonb_path_query 
+------------------
+ "array"
+(1 row)
+
+select jsonb_path_query('[null,1,true,"a",[],{}]', 'lax $.type()');
+ jsonb_path_query 
+------------------
+ "array"
+(1 row)
+
+select jsonb_path_query('[null,1,true,"a",[],{}]', '$[*].type()');
+ jsonb_path_query 
+------------------
+ "null"
+ "number"
+ "boolean"
+ "string"
+ "array"
+ "object"
+(6 rows)
+
+select jsonb_path_query('null', 'null.type()');
+ jsonb_path_query 
+------------------
+ "null"
+(1 row)
+
+select jsonb_path_query('null', 'true.type()');
+ jsonb_path_query 
+------------------
+ "boolean"
+(1 row)
+
+select jsonb_path_query('null', '123.type()');
+ jsonb_path_query 
+------------------
+ "number"
+(1 row)
+
+select jsonb_path_query('null', '"123".type()');
+ jsonb_path_query 
+------------------
+ "string"
+(1 row)
+
+select jsonb_path_query('{"a": 2}', '($.a - 5).abs() + 10');
+ jsonb_path_query 
+------------------
+ 13
+(1 row)
+
+select jsonb_path_query('{"a": 2.5}', '-($.a * $.a).floor() % 4.3');
+ jsonb_path_query 
+------------------
+ -1.7
+(1 row)
+
+select jsonb_path_query('[1, 2, 3]', '($[*] > 2) ? (@ == true)');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('[1, 2, 3]', '($[*] > 3).type()');
+ jsonb_path_query 
+------------------
+ "boolean"
+(1 row)
+
+select jsonb_path_query('[1, 2, 3]', '($[*].a > 3).type()');
+ jsonb_path_query 
+------------------
+ "boolean"
+(1 row)
+
+select jsonb_path_query('[1, 2, 3]', 'strict ($[*].a > 3).type()');
+ jsonb_path_query 
+------------------
+ "null"
+(1 row)
+
+select jsonb_path_query('[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]', 'strict $[*].size()');
+ERROR:  SQL/JSON array not found
+DETAIL:  jsonpath item method .size() is applied to not an array
+select jsonb_path_query('[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]', 'lax $[*].size()');
+ jsonb_path_query 
+------------------
+ 1
+ 1
+ 1
+ 1
+ 0
+ 1
+ 3
+ 1
+ 1
+(9 rows)
+
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].abs()');
+ jsonb_path_query 
+------------------
+ 0
+ 1
+ 2
+ 3.4
+ 5.6
+(5 rows)
+
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].floor()');
+ jsonb_path_query 
+------------------
+ 0
+ 1
+ -2
+ -4
+ 5
+(5 rows)
+
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].ceiling()');
+ jsonb_path_query 
+------------------
+ 0
+ 1
+ -2
+ -3
+ 6
+(5 rows)
+
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].ceiling().abs()');
+ jsonb_path_query 
+------------------
+ 0
+ 1
+ 2
+ 3
+ 6
+(5 rows)
+
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].ceiling().abs().type()');
+ jsonb_path_query 
+------------------
+ "number"
+ "number"
+ "number"
+ "number"
+ "number"
+(5 rows)
+
+select jsonb_path_query('[{},1]', '$[*].keyvalue()');
+ERROR:  SQL/JSON object not found
+DETAIL:  jsonpath item method .keyvalue() is applied to not an object
+select jsonb_path_query('{}', '$.keyvalue()');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{"a": 1, "b": [1, 2], "c": {"a": "bbb"}}', '$.keyvalue()');
+               jsonb_path_query               
+----------------------------------------------
+ {"id": 0, "key": "a", "value": 1}
+ {"id": 0, "key": "b", "value": [1, 2]}
+ {"id": 0, "key": "c", "value": {"a": "bbb"}}
+(3 rows)
+
+select jsonb_path_query('[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]', '$[*].keyvalue()');
+               jsonb_path_query                
+-----------------------------------------------
+ {"id": 12, "key": "a", "value": 1}
+ {"id": 12, "key": "b", "value": [1, 2]}
+ {"id": 72, "key": "c", "value": {"a": "bbb"}}
+(3 rows)
+
+select jsonb_path_query('[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]', 'strict $.keyvalue()');
+ERROR:  SQL/JSON object not found
+DETAIL:  jsonpath item method .keyvalue() is applied to not an object
+select jsonb_path_query('[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]', 'lax $.keyvalue()');
+               jsonb_path_query                
+-----------------------------------------------
+ {"id": 12, "key": "a", "value": 1}
+ {"id": 12, "key": "b", "value": [1, 2]}
+ {"id": 72, "key": "c", "value": {"a": "bbb"}}
+(3 rows)
+
+select jsonb_path_query('[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]', 'strict $.keyvalue().a');
+ERROR:  SQL/JSON object not found
+DETAIL:  jsonpath item method .keyvalue() is applied to not an object
+select jsonb '{"a": 1, "b": [1, 2]}' @? 'lax $.keyvalue()';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb '{"a": 1, "b": [1, 2]}' @? 'lax $.keyvalue().key';
+ ?column? 
+----------
+ t
+(1 row)
+
+select jsonb_path_query('null', '$.double()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .double() is applied to neither a string nor numeric value
+select jsonb_path_query('true', '$.double()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .double() is applied to neither a string nor numeric value
+select jsonb_path_query('[]', '$.double()');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[]', 'strict $.double()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .double() is applied to neither a string nor numeric value
+select jsonb_path_query('{}', '$.double()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .double() is applied to neither a string nor numeric value
+select jsonb_path_query('1.23', '$.double()');
+ jsonb_path_query 
+------------------
+ 1.23
+(1 row)
+
+select jsonb_path_query('"1.23"', '$.double()');
+ jsonb_path_query 
+------------------
+ 1.23
+(1 row)
+
+select jsonb_path_query('"1.23aaa"', '$.double()');
+ERROR:  invalid input syntax for type double precision: "1.23aaa"
+select jsonb_path_query('"nan"', '$.double()');
+ jsonb_path_query 
+------------------
+ "NaN"
+(1 row)
+
+select jsonb_path_query('"NaN"', '$.double()');
+ jsonb_path_query 
+------------------
+ "NaN"
+(1 row)
+
+select jsonb_path_query('"inf"', '$.double()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .double() is applied to not a numeric value
+select jsonb_path_query('"-inf"', '$.double()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .double() is applied to not a numeric value
+select jsonb_path_query('{}', '$.abs()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .abs() is applied to not a numeric value
+select jsonb_path_query('true', '$.floor()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .floor() is applied to not a numeric value
+select jsonb_path_query('"1.2"', '$.ceiling()');
+ERROR:  non-numeric SQL/JSON item
+DETAIL:  jsonpath item method .ceiling() is applied to not a numeric value
+select jsonb_path_query('["", "a", "abc", "abcabc"]', '$[*] ? (@ starts with "abc")');
+ jsonb_path_query 
+------------------
+ "abc"
+ "abcabc"
+(2 rows)
+
+select jsonb_path_query('["", "a", "abc", "abcabc"]', 'strict $ ? (@[*] starts with "abc")');
+      jsonb_path_query      
+----------------------------
+ ["", "a", "abc", "abcabc"]
+(1 row)
+
+select jsonb_path_query('["", "a", "abd", "abdabc"]', 'strict $ ? (@[*] starts with "abc")');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('["abc", "abcabc", null, 1]', 'strict $ ? (@[*] starts with "abc")');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('["abc", "abcabc", null, 1]', 'strict $ ? ((@[*] starts with "abc") is unknown)');
+      jsonb_path_query      
+----------------------------
+ ["abc", "abcabc", null, 1]
+(1 row)
+
+select jsonb_path_query('[[null, 1, "abc", "abcabc"]]', 'lax $ ? (@[*] starts with "abc")');
+      jsonb_path_query      
+----------------------------
+ [null, 1, "abc", "abcabc"]
+(1 row)
+
+select jsonb_path_query('[[null, 1, "abd", "abdabc"]]', 'lax $ ? ((@[*] starts with "abc") is unknown)');
+      jsonb_path_query      
+----------------------------
+ [null, 1, "abd", "abdabc"]
+(1 row)
+
+select jsonb_path_query('[null, 1, "abd", "abdabc"]', 'lax $[*] ? ((@ starts with "abc") is unknown)');
+ jsonb_path_query 
+------------------
+ null
+ 1
+(2 rows)
+
+select jsonb_path_query('[null, 1, "abc", "abd", "aBdC", "abdacb", "adc\nabc", "babc"]', 'lax $[*] ? (@ like_regex "^ab.*c")');
+ jsonb_path_query 
+------------------
+ "abc"
+ "abdacb"
+(2 rows)
+
+select jsonb_path_query('[null, 1, "abc", "abd", "aBdC", "abdacb", "adc\nabc", "babc"]', 'lax $[*] ? (@ like_regex "^a  b.*  c " flag "ix")');
+ jsonb_path_query 
+------------------
+ "abc"
+ "aBdC"
+ "abdacb"
+(3 rows)
+
+select jsonb_path_query('[null, 1, "abc", "abd", "aBdC", "abdacb", "adc\nabc", "babc"]', 'lax $[*] ? (@ like_regex "^ab.*c" flag "m")');
+ jsonb_path_query 
+------------------
+ "abc"
+ "abdacb"
+ "adc\nabc"
+(3 rows)
+
+select jsonb_path_query('[null, 1, "abc", "abd", "aBdC", "abdacb", "adc\nabc", "babc"]', 'lax $[*] ? (@ like_regex "^ab.*c" flag "s")');
+ jsonb_path_query 
+------------------
+ "abc"
+ "abdacb"
+(2 rows)
+
+-- jsonpath operators
+SELECT jsonb_path_query('[{"a": 1}, {"a": 2}]', '$[*]');
+ jsonb_path_query 
+------------------
+ {"a": 1}
+ {"a": 2}
+(2 rows)
+
+SELECT jsonb_path_query('[{"a": 1}, {"a": 2}]', '$[*] ? (@.a > 10)');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}, {}]', 'strict $[*].a');
+ERROR:  SQL/JSON member not found
+DETAIL:  JSON object does not contain key "a"
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}]', '$[*].a');
+ jsonb_path_query_array 
+------------------------
+ [1, 2]
+(1 row)
+
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}]', '$[*].a ? (@ == 1)');
+ jsonb_path_query_array 
+------------------------
+ [1]
+(1 row)
+
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}]', '$[*].a ? (@ > 10)');
+ jsonb_path_query_array 
+------------------------
+ []
+(1 row)
+
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*].a ? (@ > $min && @ < $max)', '{"min": 1, "max": 4}');
+ jsonb_path_query_array 
+------------------------
+ [2, 3]
+(1 row)
+
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*].a ? (@ > $min && @ < $max)', '{"min": 3, "max": 4}');
+ jsonb_path_query_array 
+------------------------
+ []
+(1 row)
+
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}, {}]', 'strict $[*].a');
+ERROR:  SQL/JSON member not found
+DETAIL:  JSON object does not contain key "a"
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}]', '$[*].a');
+ jsonb_path_query_first 
+------------------------
+ 1
+(1 row)
+
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}]', '$[*].a ? (@ == 1)');
+ jsonb_path_query_first 
+------------------------
+ 1
+(1 row)
+
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}]', '$[*].a ? (@ > 10)');
+ jsonb_path_query_first 
+------------------------
+ 
+(1 row)
+
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*].a ? (@ > $min && @ < $max)', '{"min": 1, "max": 4}');
+ jsonb_path_query_first 
+------------------------
+ 2
+(1 row)
+
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*].a ? (@ > $min && @ < $max)', '{"min": 3, "max": 4}');
+ jsonb_path_query_first 
+------------------------
+ 
+(1 row)
+
+SELECT jsonb '[{"a": 1}, {"a": 2}]' @? '$[*].a ? (@ > 1)';
+ ?column? 
+----------
+ t
+(1 row)
+
+SELECT jsonb '[{"a": 1}, {"a": 2}]' @? '$[*] ? (@.a > 2)';
+ ?column? 
+----------
+ f
+(1 row)
+
+SELECT jsonb_path_exists('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*] ? (@.a > $min && @.a < $max)', '{"min": 1, "max": 4}');
+ jsonb_path_exists 
+-------------------
+ t
+(1 row)
+
+SELECT jsonb_path_exists('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*] ? (@.a > $min && @.a < $max)', '{"min": 3, "max": 4}');
+ jsonb_path_exists 
+-------------------
+ f
+(1 row)
+
+SELECT jsonb '[{"a": 1}, {"a": 2}]' @@ '$[*].a > 1';
+ ?column? 
+----------
+ t
+(1 row)
+
+SELECT jsonb '[{"a": 1}, {"a": 2}]' @@ '$[*].a > 2';
+ ?column? 
+----------
+ f
+(1 row)
+
diff --git a/src/test/regress/expected/jsonpath.out b/src/test/regress/expected/jsonpath.out
new file mode 100644
index 0000000..baaf9e3
--- /dev/null
+++ b/src/test/regress/expected/jsonpath.out
@@ -0,0 +1,806 @@
+--jsonpath io
+select ''::jsonpath;
+ERROR:  invalid input syntax for jsonpath: ""
+LINE 1: select ''::jsonpath;
+               ^
+select '$'::jsonpath;
+ jsonpath 
+----------
+ $
+(1 row)
+
+select 'strict $'::jsonpath;
+ jsonpath 
+----------
+ strict $
+(1 row)
+
+select 'lax $'::jsonpath;
+ jsonpath 
+----------
+ $
+(1 row)
+
+select '$.a'::jsonpath;
+ jsonpath 
+----------
+ $."a"
+(1 row)
+
+select '$.a.v'::jsonpath;
+ jsonpath  
+-----------
+ $."a"."v"
+(1 row)
+
+select '$.a.*'::jsonpath;
+ jsonpath 
+----------
+ $."a".*
+(1 row)
+
+select '$.*[*]'::jsonpath;
+ jsonpath 
+----------
+ $.*[*]
+(1 row)
+
+select '$.a[*]'::jsonpath;
+ jsonpath 
+----------
+ $."a"[*]
+(1 row)
+
+select '$.a[*][*]'::jsonpath;
+  jsonpath   
+-------------
+ $."a"[*][*]
+(1 row)
+
+select '$[*]'::jsonpath;
+ jsonpath 
+----------
+ $[*]
+(1 row)
+
+select '$[0]'::jsonpath;
+ jsonpath 
+----------
+ $[0]
+(1 row)
+
+select '$[*][0]'::jsonpath;
+ jsonpath 
+----------
+ $[*][0]
+(1 row)
+
+select '$[*].a'::jsonpath;
+ jsonpath 
+----------
+ $[*]."a"
+(1 row)
+
+select '$[*][0].a.b'::jsonpath;
+    jsonpath     
+-----------------
+ $[*][0]."a"."b"
+(1 row)
+
+select '$.a.**.b'::jsonpath;
+   jsonpath   
+--------------
+ $."a".**."b"
+(1 row)
+
+select '$.a.**{2}.b'::jsonpath;
+    jsonpath     
+-----------------
+ $."a".**{2}."b"
+(1 row)
+
+select '$.a.**{2 to 2}.b'::jsonpath;
+    jsonpath     
+-----------------
+ $."a".**{2}."b"
+(1 row)
+
+select '$.a.**{2 to 5}.b'::jsonpath;
+       jsonpath       
+----------------------
+ $."a".**{2 to 5}."b"
+(1 row)
+
+select '$.a.**{0 to 5}.b'::jsonpath;
+       jsonpath       
+----------------------
+ $."a".**{0 to 5}."b"
+(1 row)
+
+select '$.a.**{5 to last}.b'::jsonpath;
+        jsonpath         
+-------------------------
+ $."a".**{5 to last}."b"
+(1 row)
+
+select '$.a.**{last}.b'::jsonpath;
+      jsonpath      
+--------------------
+ $."a".**{last}."b"
+(1 row)
+
+select '$.a.**{last to 5}.b'::jsonpath;
+        jsonpath         
+-------------------------
+ $."a".**{last to 5}."b"
+(1 row)
+
+select '$+1'::jsonpath;
+ jsonpath 
+----------
+ ($ + 1)
+(1 row)
+
+select '$-1'::jsonpath;
+ jsonpath 
+----------
+ ($ - 1)
+(1 row)
+
+select '$--+1'::jsonpath;
+ jsonpath 
+----------
+ ($ - -1)
+(1 row)
+
+select '$.a/+-1'::jsonpath;
+   jsonpath   
+--------------
+ ($."a" / -1)
+(1 row)
+
+select '1 * 2 + 4 % -3 != false'::jsonpath;
+         jsonpath          
+---------------------------
+ (1 * 2 + 4 % -3 != false)
+(1 row)
+
+select '"\b\f\r\n\t\v\"\''\\"'::jsonpath;
+        jsonpath         
+-------------------------
+ "\b\f\r\n\t\u000b\"'\\"
+(1 row)
+
+select '''\b\f\r\n\t\v\"\''\\'''::jsonpath;
+        jsonpath         
+-------------------------
+ "\b\f\r\n\t\u000b\"'\\"
+(1 row)
+
+select '"\x50\u0067\u{53}\u{051}\u{00004C}"'::jsonpath;
+ jsonpath 
+----------
+ "PgSQL"
+(1 row)
+
+select '''\x50\u0067\u{53}\u{051}\u{00004C}'''::jsonpath;
+ jsonpath 
+----------
+ "PgSQL"
+(1 row)
+
+select '$.foo\x50\u0067\u{53}\u{051}\u{00004C}\t\"bar'::jsonpath;
+      jsonpath       
+---------------------
+ $."fooPgSQL\t\"bar"
+(1 row)
+
+select '$.g ? ($.a == 1)'::jsonpath;
+      jsonpath      
+--------------------
+ $."g"?($."a" == 1)
+(1 row)
+
+select '$.g ? (@ == 1)'::jsonpath;
+    jsonpath    
+----------------
+ $."g"?(@ == 1)
+(1 row)
+
+select '$.g ? (@.a == 1)'::jsonpath;
+      jsonpath      
+--------------------
+ $."g"?(@."a" == 1)
+(1 row)
+
+select '$.g ? (@.a == 1 || @.a == 4)'::jsonpath;
+             jsonpath             
+----------------------------------
+ $."g"?(@."a" == 1 || @."a" == 4)
+(1 row)
+
+select '$.g ? (@.a == 1 && @.a == 4)'::jsonpath;
+             jsonpath             
+----------------------------------
+ $."g"?(@."a" == 1 && @."a" == 4)
+(1 row)
+
+select '$.g ? (@.a == 1 || @.a == 4 && @.b == 7)'::jsonpath;
+                    jsonpath                    
+------------------------------------------------
+ $."g"?(@."a" == 1 || @."a" == 4 && @."b" == 7)
+(1 row)
+
+select '$.g ? (@.a == 1 || !(@.a == 4) && @.b == 7)'::jsonpath;
+                     jsonpath                      
+---------------------------------------------------
+ $."g"?(@."a" == 1 || !(@."a" == 4) && @."b" == 7)
+(1 row)
+
+select '$.g ? (@.a == 1 || !(@.x >= 123 || @.a == 4) && @.b == 7)'::jsonpath;
+                             jsonpath                              
+-------------------------------------------------------------------
+ $."g"?(@."a" == 1 || !(@."x" >= 123 || @."a" == 4) && @."b" == 7)
+(1 row)
+
+select '$.g ? (@.x >= @[*]?(@.a > "abc"))'::jsonpath;
+               jsonpath                
+---------------------------------------
+ $."g"?(@."x" >= @[*]?(@."a" > "abc"))
+(1 row)
+
+select '$.g ? ((@.x >= 123 || @.a == 4) is unknown)'::jsonpath;
+                    jsonpath                     
+-------------------------------------------------
+ $."g"?((@."x" >= 123 || @."a" == 4) is unknown)
+(1 row)
+
+select '$.g ? (exists (@.x))'::jsonpath;
+        jsonpath        
+------------------------
+ $."g"?(exists (@."x"))
+(1 row)
+
+select '$.g ? (exists (@.x ? (@ == 14)))'::jsonpath;
+             jsonpath             
+----------------------------------
+ $."g"?(exists (@."x"?(@ == 14)))
+(1 row)
+
+select '$.g ? ((@.x >= 123 || @.a == 4) && exists (@.x ? (@ == 14)))'::jsonpath;
+                             jsonpath                             
+------------------------------------------------------------------
+ $."g"?((@."x" >= 123 || @."a" == 4) && exists (@."x"?(@ == 14)))
+(1 row)
+
+select '$.g ? (+@.x >= +-(+@.a + 2))'::jsonpath;
+              jsonpath              
+------------------------------------
+ $."g"?(+@."x" >= +(-(+@."a" + 2)))
+(1 row)
+
+select '$a'::jsonpath;
+ jsonpath 
+----------
+ $"a"
+(1 row)
+
+select '$a.b'::jsonpath;
+ jsonpath 
+----------
+ $"a"."b"
+(1 row)
+
+select '$a[*]'::jsonpath;
+ jsonpath 
+----------
+ $"a"[*]
+(1 row)
+
+select '$.g ? (@.zip == $zip)'::jsonpath;
+         jsonpath          
+---------------------------
+ $."g"?(@."zip" == $"zip")
+(1 row)
+
+select '$.a[1,2, 3 to 16]'::jsonpath;
+      jsonpath      
+--------------------
+ $."a"[1,2,3 to 16]
+(1 row)
+
+select '$.a[$a + 1, ($b[*]) to -($[0] * 2)]'::jsonpath;
+                jsonpath                
+----------------------------------------
+ $."a"[$"a" + 1,$"b"[*] to -($[0] * 2)]
+(1 row)
+
+select '$.a[$.a.size() - 3]'::jsonpath;
+        jsonpath         
+-------------------------
+ $."a"[$."a".size() - 3]
+(1 row)
+
+select 'last'::jsonpath;
+ERROR:  LAST is allowed only in array subscripts
+LINE 1: select 'last'::jsonpath;
+               ^
+select '"last"'::jsonpath;
+ jsonpath 
+----------
+ "last"
+(1 row)
+
+select '$.last'::jsonpath;
+ jsonpath 
+----------
+ $."last"
+(1 row)
+
+select '$ ? (last > 0)'::jsonpath;
+ERROR:  LAST is allowed only in array subscripts
+LINE 1: select '$ ? (last > 0)'::jsonpath;
+               ^
+select '$[last]'::jsonpath;
+ jsonpath 
+----------
+ $[last]
+(1 row)
+
+select '$[$[0] ? (last > 0)]'::jsonpath;
+      jsonpath      
+--------------------
+ $[$[0]?(last > 0)]
+(1 row)
+
+select 'null.type()'::jsonpath;
+  jsonpath   
+-------------
+ null.type()
+(1 row)
+
+select '1.type()'::jsonpath;
+ jsonpath 
+----------
+ 1.type()
+(1 row)
+
+select '"aaa".type()'::jsonpath;
+   jsonpath   
+--------------
+ "aaa".type()
+(1 row)
+
+select 'true.type()'::jsonpath;
+  jsonpath   
+-------------
+ true.type()
+(1 row)
+
+select '$.double().floor().ceiling().abs()'::jsonpath;
+              jsonpath              
+------------------------------------
+ $.double().floor().ceiling().abs()
+(1 row)
+
+select '$.keyvalue().key'::jsonpath;
+      jsonpath      
+--------------------
+ $.keyvalue()."key"
+(1 row)
+
+select '$ ? (@ starts with "abc")'::jsonpath;
+        jsonpath         
+-------------------------
+ $?(@ starts with "abc")
+(1 row)
+
+select '$ ? (@ starts with $var)'::jsonpath;
+         jsonpath         
+--------------------------
+ $?(@ starts with $"var")
+(1 row)
+
+select '$ ? (@ like_regex "(invalid pattern")'::jsonpath;
+ERROR:  invalid regular expression: parentheses () not balanced
+LINE 1: select '$ ? (@ like_regex "(invalid pattern")'::jsonpath;
+               ^
+select '$ ? (@ like_regex "pattern")'::jsonpath;
+          jsonpath          
+----------------------------
+ $?(@ like_regex "pattern")
+(1 row)
+
+select '$ ? (@ like_regex "pattern" flag "")'::jsonpath;
+          jsonpath          
+----------------------------
+ $?(@ like_regex "pattern")
+(1 row)
+
+select '$ ? (@ like_regex "pattern" flag "i")'::jsonpath;
+              jsonpath               
+-------------------------------------
+ $?(@ like_regex "pattern" flag "i")
+(1 row)
+
+select '$ ? (@ like_regex "pattern" flag "is")'::jsonpath;
+               jsonpath               
+--------------------------------------
+ $?(@ like_regex "pattern" flag "is")
+(1 row)
+
+select '$ ? (@ like_regex "pattern" flag "isim")'::jsonpath;
+               jsonpath               
+--------------------------------------
+ $?(@ like_regex "pattern" flag "im")
+(1 row)
+
+select '$ ? (@ like_regex "pattern" flag "xsms")'::jsonpath;
+               jsonpath               
+--------------------------------------
+ $?(@ like_regex "pattern" flag "sx")
+(1 row)
+
+select '$ ? (@ like_regex "pattern" flag "a")'::jsonpath;
+ERROR:  bad jsonpath representation
+LINE 1: select '$ ? (@ like_regex "pattern" flag "a")'::jsonpath;
+               ^
+DETAIL:  unrecognized flag of LIKE_REGEX predicate at or near """
+select '$ < 1'::jsonpath;
+ jsonpath 
+----------
+ ($ < 1)
+(1 row)
+
+select '($ < 1) || $.a.b <= $x'::jsonpath;
+           jsonpath           
+------------------------------
+ ($ < 1 || $."a"."b" <= $"x")
+(1 row)
+
+select '@ + 1'::jsonpath;
+ERROR:  @ is not allowed in root expressions
+LINE 1: select '@ + 1'::jsonpath;
+               ^
+select '($).a.b'::jsonpath;
+ jsonpath  
+-----------
+ $."a"."b"
+(1 row)
+
+select '($.a.b).c.d'::jsonpath;
+     jsonpath      
+-------------------
+ $."a"."b"."c"."d"
+(1 row)
+
+select '($.a.b + -$.x.y).c.d'::jsonpath;
+             jsonpath             
+----------------------------------
+ ($."a"."b" + -$."x"."y")."c"."d"
+(1 row)
+
+select '(-+$.a.b).c.d'::jsonpath;
+        jsonpath         
+-------------------------
+ (-(+$."a"."b"))."c"."d"
+(1 row)
+
+select '1 + ($.a.b + 2).c.d'::jsonpath;
+           jsonpath            
+-------------------------------
+ (1 + ($."a"."b" + 2)."c"."d")
+(1 row)
+
+select '1 + ($.a.b > 2).c.d'::jsonpath;
+           jsonpath            
+-------------------------------
+ (1 + ($."a"."b" > 2)."c"."d")
+(1 row)
+
+select '($)'::jsonpath;
+ jsonpath 
+----------
+ $
+(1 row)
+
+select '(($))'::jsonpath;
+ jsonpath 
+----------
+ $
+(1 row)
+
+select '((($ + 1)).a + ((2)).b ? ((((@ > 1)) || (exists(@.c)))))'::jsonpath;
+                    jsonpath                     
+-------------------------------------------------
+ (($ + 1)."a" + 2."b"?(@ > 1 || exists (@."c")))
+(1 row)
+
+select '$ ? (@.a < 1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < -1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < -1)
+(1 row)
+
+select '$ ? (@.a < +1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < .1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 0.1)
+(1 row)
+
+select '$ ? (@.a < -.1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < -0.1)
+(1 row)
+
+select '$ ? (@.a < +.1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 0.1)
+(1 row)
+
+select '$ ? (@.a < 0.1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 0.1)
+(1 row)
+
+select '$ ? (@.a < -0.1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < -0.1)
+(1 row)
+
+select '$ ? (@.a < +0.1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 0.1)
+(1 row)
+
+select '$ ? (@.a < 10.1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < 10.1)
+(1 row)
+
+select '$ ? (@.a < -10.1)'::jsonpath;
+     jsonpath      
+-------------------
+ $?(@."a" < -10.1)
+(1 row)
+
+select '$ ? (@.a < +10.1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < 10.1)
+(1 row)
+
+select '$ ? (@.a < 1e1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < 10)
+(1 row)
+
+select '$ ? (@.a < -1e1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < -10)
+(1 row)
+
+select '$ ? (@.a < +1e1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < 10)
+(1 row)
+
+select '$ ? (@.a < .1e1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < -.1e1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < -1)
+(1 row)
+
+select '$ ? (@.a < +.1e1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < 0.1e1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < -0.1e1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < -1)
+(1 row)
+
+select '$ ? (@.a < +0.1e1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < 10.1e1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 101)
+(1 row)
+
+select '$ ? (@.a < -10.1e1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < -101)
+(1 row)
+
+select '$ ? (@.a < +10.1e1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 101)
+(1 row)
+
+select '$ ? (@.a < 1e-1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 0.1)
+(1 row)
+
+select '$ ? (@.a < -1e-1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < -0.1)
+(1 row)
+
+select '$ ? (@.a < +1e-1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 0.1)
+(1 row)
+
+select '$ ? (@.a < .1e-1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < 0.01)
+(1 row)
+
+select '$ ? (@.a < -.1e-1)'::jsonpath;
+     jsonpath      
+-------------------
+ $?(@."a" < -0.01)
+(1 row)
+
+select '$ ? (@.a < +.1e-1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < 0.01)
+(1 row)
+
+select '$ ? (@.a < 0.1e-1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < 0.01)
+(1 row)
+
+select '$ ? (@.a < -0.1e-1)'::jsonpath;
+     jsonpath      
+-------------------
+ $?(@."a" < -0.01)
+(1 row)
+
+select '$ ? (@.a < +0.1e-1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < 0.01)
+(1 row)
+
+select '$ ? (@.a < 10.1e-1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < 1.01)
+(1 row)
+
+select '$ ? (@.a < -10.1e-1)'::jsonpath;
+     jsonpath      
+-------------------
+ $?(@."a" < -1.01)
+(1 row)
+
+select '$ ? (@.a < +10.1e-1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < 1.01)
+(1 row)
+
+select '$ ? (@.a < 1e+1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < 10)
+(1 row)
+
+select '$ ? (@.a < -1e+1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < -10)
+(1 row)
+
+select '$ ? (@.a < +1e+1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < 10)
+(1 row)
+
+select '$ ? (@.a < .1e+1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < -.1e+1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < -1)
+(1 row)
+
+select '$ ? (@.a < +.1e+1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < 0.1e+1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < -0.1e+1)'::jsonpath;
+    jsonpath    
+----------------
+ $?(@."a" < -1)
+(1 row)
+
+select '$ ? (@.a < +0.1e+1)'::jsonpath;
+   jsonpath    
+---------------
+ $?(@."a" < 1)
+(1 row)
+
+select '$ ? (@.a < 10.1e+1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 101)
+(1 row)
+
+select '$ ? (@.a < -10.1e+1)'::jsonpath;
+     jsonpath     
+------------------
+ $?(@."a" < -101)
+(1 row)
+
+select '$ ? (@.a < +10.1e+1)'::jsonpath;
+    jsonpath     
+-----------------
+ $?(@."a" < 101)
+(1 row)
+
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index 4051a4a..c10d909 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -110,7 +110,12 @@ test: publication subscription
 # ----------
 # Another group of parallel tests
 # ----------
-test: select_views portals_p2 foreign_key cluster dependency guc bitmapops combocid tsearch tsdicts foreign_data window xmlmap functional_deps advisory_lock json jsonb json_encoding indirect_toast equivclass
+test: select_views portals_p2 foreign_key cluster dependency guc bitmapops combocid tsearch tsdicts foreign_data window xmlmap functional_deps advisory_lock indirect_toast equivclass
+
+# ----------
+# Another group of parallel tests (JSON related)
+# ----------
+test: json jsonb json_encoding jsonpath jsonb_jsonpath
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index ac1ea62..d2bf88b 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -157,6 +157,8 @@ test: advisory_lock
 test: json
 test: jsonb
 test: json_encoding
+test: jsonpath
+test: jsonb_jsonpath
 test: indirect_toast
 test: equivclass
 test: plancache
diff --git a/src/test/regress/sql/jsonb_jsonpath.sql b/src/test/regress/sql/jsonb_jsonpath.sql
new file mode 100644
index 0000000..bb5f97b
--- /dev/null
+++ b/src/test/regress/sql/jsonb_jsonpath.sql
@@ -0,0 +1,329 @@
+select jsonb '{"a": 12}' @? '$';
+select jsonb '{"a": 12}' @? '1';
+select jsonb '{"a": 12}' @? '$.a.b';
+select jsonb '{"a": 12}' @? '$.b';
+select jsonb '{"a": 12}' @? '$.a + 2';
+select jsonb '{"a": 12}' @? '$.b + 2';
+select jsonb '{"a": {"a": 12}}' @? '$.a.a';
+select jsonb '{"a": {"a": 12}}' @? '$.*.a';
+select jsonb '{"b": {"a": 12}}' @? '$.*.a';
+select jsonb '{"b": {"a": 12}}' @? '$.*.b';
+select jsonb '{"b": {"a": 12}}' @? 'strict $.*.b';
+select jsonb '{}' @? '$.*';
+select jsonb '{"a": 1}' @? '$.*';
+select jsonb '{"a": {"b": 1}}' @? 'lax $.**{1}';
+select jsonb '{"a": {"b": 1}}' @? 'lax $.**{2}';
+select jsonb '{"a": {"b": 1}}' @? 'lax $.**{3}';
+select jsonb '[]' @? '$[*]';
+select jsonb '[1]' @? '$[*]';
+select jsonb '[1]' @? '$[1]';
+select jsonb '[1]' @? 'strict $[1]';
+select jsonb_path_query('[1]', 'strict $[1]');
+select jsonb '[1]' @? 'lax $[10000000000000000]';
+select jsonb '[1]' @? 'strict $[10000000000000000]';
+select jsonb_path_query('[1]', 'lax $[10000000000000000]');
+select jsonb_path_query('[1]', 'strict $[10000000000000000]');
+select jsonb '[1]' @? '$[0]';
+select jsonb '[1]' @? '$[0.3]';
+select jsonb '[1]' @? '$[0.5]';
+select jsonb '[1]' @? '$[0.9]';
+select jsonb '[1]' @? '$[1.2]';
+select jsonb '[1]' @? 'strict $[1.2]';
+select jsonb '{"a": [1,2,3], "b": [3,4,5]}' @? '$ ? (@.a[*] >  @.b[*])';
+select jsonb '{"a": [1,2,3], "b": [3,4,5]}' @? '$ ? (@.a[*] >= @.b[*])';
+select jsonb '{"a": [1,2,3], "b": [3,4,"5"]}' @? '$ ? (@.a[*] >= @.b[*])';
+select jsonb '{"a": [1,2,3], "b": [3,4,"5"]}' @? 'strict $ ? (@.a[*] >= @.b[*])';
+select jsonb '{"a": [1,2,3], "b": [3,4,null]}' @? '$ ? (@.a[*] >= @.b[*])';
+select jsonb '1' @? '$ ? ((@ == "1") is unknown)';
+select jsonb '1' @? '$ ? ((@ == 1) is unknown)';
+select jsonb '[{"a": 1}, {"a": 2}]' @? '$[0 to 1] ? (@.a > 1)';
+
+select jsonb_path_query('1', 'lax $.a');
+select jsonb_path_query('1', 'strict $.a');
+select jsonb_path_query('1', 'strict $.*');
+select jsonb_path_query('[]', 'lax $.a');
+select jsonb_path_query('[]', 'strict $.a');
+select jsonb_path_query('{}', 'lax $.a');
+select jsonb_path_query('{}', 'strict $.a');
+
+select jsonb_path_query('1', 'strict $[1]');
+select jsonb_path_query('1', 'strict $[*]');
+select jsonb_path_query('[]', 'strict $[1]');
+select jsonb_path_query('[]', 'strict $["a"]');
+
+select jsonb_path_query('{"a": 12, "b": {"a": 13}}', '$.a');
+select jsonb_path_query('{"a": 12, "b": {"a": 13}}', '$.b');
+select jsonb_path_query('{"a": 12, "b": {"a": 13}}', '$.*');
+select jsonb_path_query('{"a": 12, "b": {"a": 13}}', 'lax $.*.a');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[*].a');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[*].*');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[0].a');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[1].a');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[2].a');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[0,1].a');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[0 to 10].a');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}]', 'lax $[0 to 10 / 0].a');
+select jsonb_path_query('[12, {"a": 13}, {"b": 14}, "ccc", true]', '$[2.5 - 1 to $.size() - 2]');
+select jsonb_path_query('1', 'lax $[0]');
+select jsonb_path_query('1', 'lax $[*]');
+select jsonb_path_query('[1]', 'lax $[0]');
+select jsonb_path_query('[1]', 'lax $[*]');
+select jsonb_path_query('[1,2,3]', 'lax $[*]');
+select jsonb_path_query('[1,2,3]', 'strict $[*].a');
+select jsonb_path_query('[]', '$[last]');
+select jsonb_path_query('[]', '$[last ? (exists(last))]');
+select jsonb_path_query('[]', 'strict $[last]');
+select jsonb_path_query('[1]', '$[last]');
+select jsonb_path_query('[1,2,3]', '$[last]');
+select jsonb_path_query('[1,2,3]', '$[last - 1]');
+select jsonb_path_query('[1,2,3]', '$[last ? (@.type() == "number")]');
+select jsonb_path_query('[1,2,3]', '$[last ? (@.type() == "string")]');
+
+select * from jsonb_path_query('{"a": 10}', '$');
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)');
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)', '1');
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)', '[{"value" : 13}]');
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)', '{"value" : 13}');
+select * from jsonb_path_query('{"a": 10}', '$ ? (@.a < $value)', '{"value" : 8}');
+select * from jsonb_path_query('{"a": 10}', '$.a ? (@ < $value)', '{"value" : 13}');
+select * from jsonb_path_query('[10,11,12,13,14,15]', '$[*] ? (@ < $value)', '{"value" : 13}');
+select * from jsonb_path_query('[10,11,12,13,14,15]', '$[0,1] ? (@ < $x.value)', '{"x": {"value" : 13}}');
+select * from jsonb_path_query('[10,11,12,13,14,15]', '$[0 to 2] ? (@ < $value)', '{"value" : 15}');
+select * from jsonb_path_query('[1,"1",2,"2",null]', '$[*] ? (@ == "1")');
+select * from jsonb_path_query('[1,"1",2,"2",null]', '$[*] ? (@ == $value)', '{"value" : "1"}');
+select * from jsonb_path_query('[1,"1",2,"2",null]', '$[*] ? (@ == $value)', '{"value" : null}');
+select * from jsonb_path_query('[1, "2", null]', '$[*] ? (@ != null)');
+select * from jsonb_path_query('[1, "2", null]', '$[*] ? (@ == null)');
+select * from jsonb_path_query('{}', '$ ? (@ == @)');
+select * from jsonb_path_query('[]', 'strict $ ? (@ == @)');
+
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{0}');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{0 to last}');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1}');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1 to last}');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{2}');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{2 to last}');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{3 to last}');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{last}');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{0}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{0 to last}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1 to last}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"b": 1}}', 'lax $.**{1 to 2}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{0}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{1}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{0 to last}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{1 to last}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{1 to 2}.b ? (@ > 0)');
+select jsonb_path_query('{"a": {"c": {"b": 1}}}', 'lax $.**{2 to 3}.b ? (@ > 0)');
+
+select jsonb '{"a": {"b": 1}}' @? '$.**.b ? ( @ > 0)';
+select jsonb '{"a": {"b": 1}}' @? '$.**{0}.b ? ( @ > 0)';
+select jsonb '{"a": {"b": 1}}' @? '$.**{1}.b ? ( @ > 0)';
+select jsonb '{"a": {"b": 1}}' @? '$.**{0 to last}.b ? ( @ > 0)';
+select jsonb '{"a": {"b": 1}}' @? '$.**{1 to last}.b ? ( @ > 0)';
+select jsonb '{"a": {"b": 1}}' @? '$.**{1 to 2}.b ? ( @ > 0)';
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**.b ? ( @ > 0)';
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{0}.b ? ( @ > 0)';
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{1}.b ? ( @ > 0)';
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{0 to last}.b ? ( @ > 0)';
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{1 to last}.b ? ( @ > 0)';
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{1 to 2}.b ? ( @ > 0)';
+select jsonb '{"a": {"c": {"b": 1}}}' @? '$.**{2 to 3}.b ? ( @ > 0)';
+
+select jsonb_path_query('{"g": {"x": 2}}', '$.g ? (exists (@.x))');
+select jsonb_path_query('{"g": {"x": 2}}', '$.g ? (exists (@.y))');
+select jsonb_path_query('{"g": {"x": 2}}', '$.g ? (exists (@.x ? (@ >= 2) ))');
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'lax $.g ? (exists (@.x))');
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'lax $.g ? (exists (@.x + "3"))');
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'lax $.g ? ((exists (@.x + "3")) is unknown)');
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'strict $.g[*] ? (exists (@.x))');
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'strict $.g[*] ? ((exists (@.x)) is unknown)');
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'strict $.g ? (exists (@[*].x))');
+select jsonb_path_query('{"g": [{"x": 2}, {"y": 3}]}', 'strict $.g ? ((exists (@[*].x)) is unknown)');
+
+--test ternary logic
+select
+	x, y,
+	jsonb_path_query(
+		'[true, false, null]',
+		'$[*] ? (@ == true  &&  ($x == true && $y == true) ||
+				 @ == false && !($x == true && $y == true) ||
+				 @ == null  &&  ($x == true && $y == true) is unknown)',
+		jsonb_build_object('x', x, 'y', y)
+	) as "x && y"
+from
+	(values (jsonb 'true'), ('false'), ('"null"')) x(x),
+	(values (jsonb 'true'), ('false'), ('"null"')) y(y);
+
+select
+	x, y,
+	jsonb_path_query(
+		'[true, false, null]',
+		'$[*] ? (@ == true  &&  ($x == true || $y == true) ||
+				 @ == false && !($x == true || $y == true) ||
+				 @ == null  &&  ($x == true || $y == true) is unknown)',
+		jsonb_build_object('x', x, 'y', y)
+	) as "x || y"
+from
+	(values (jsonb 'true'), ('false'), ('"null"')) x(x),
+	(values (jsonb 'true'), ('false'), ('"null"')) y(y);
+
+select jsonb '{"a": 1, "b":1}' @? '$ ? (@.a == @.b)';
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$ ? (@.a == @.b)';
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$.c ? (@.a == @.b)';
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$.c ? ($.c.a == @.b)';
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$.* ? (@.a == @.b)';
+select jsonb '{"a": 1, "b":1}' @? '$.** ? (@.a == @.b)';
+select jsonb '{"c": {"a": 1, "b":1}}' @? '$.** ? (@.a == @.b)';
+
+select jsonb_path_query('{"c": {"a": 2, "b":1}}', '$.** ? (@.a == 1 + 1)');
+select jsonb_path_query('{"c": {"a": 2, "b":1}}', '$.** ? (@.a == (1 + 1))');
+select jsonb_path_query('{"c": {"a": 2, "b":1}}', '$.** ? (@.a == @.b + 1)');
+select jsonb_path_query('{"c": {"a": 2, "b":1}}', '$.** ? (@.a == (@.b + 1))');
+select jsonb '{"c": {"a": -1, "b":1}}' @? '$.** ? (@.a == - 1)';
+select jsonb '{"c": {"a": -1, "b":1}}' @? '$.** ? (@.a == -1)';
+select jsonb '{"c": {"a": -1, "b":1}}' @? '$.** ? (@.a == -@.b)';
+select jsonb '{"c": {"a": -1, "b":1}}' @? '$.** ? (@.a == - @.b)';
+select jsonb '{"c": {"a": 0, "b":1}}' @? '$.** ? (@.a == 1 - @.b)';
+select jsonb '{"c": {"a": 2, "b":1}}' @? '$.** ? (@.a == 1 - - @.b)';
+select jsonb '{"c": {"a": 0, "b":1}}' @? '$.** ? (@.a == 1 - +@.b)';
+select jsonb '[1,2,3]' @? '$ ? (+@[*] > +2)';
+select jsonb '[1,2,3]' @? '$ ? (+@[*] > +3)';
+select jsonb '[1,2,3]' @? '$ ? (-@[*] < -2)';
+select jsonb '[1,2,3]' @? '$ ? (-@[*] < -3)';
+select jsonb '1' @? '$ ? ($ > 0)';
+
+-- arithmetic errors
+select jsonb_path_query('[1,2,0,3]', '$[*] ? (2 / @ > 0)');
+select jsonb_path_query('[1,2,0,3]', '$[*] ? ((2 / @ > 0) is unknown)');
+select jsonb_path_query('0', '1 / $');
+select jsonb_path_query('0', '1 / $ + 2');
+select jsonb_path_query('0', '-(3 + 1 % $)');
+select jsonb_path_query('1', '$ + "2"');
+select jsonb_path_query('[1, 2]', '3 * $');
+select jsonb_path_query('"a"', '-$');
+select jsonb_path_query('[1,"2",3]', '+$');
+select jsonb '["1",2,0,3]' @? '-$[*]';
+select jsonb '[1,"2",0,3]' @? '-$[*]';
+select jsonb '["1",2,0,3]' @? 'strict -$[*]';
+select jsonb '[1,"2",0,3]' @? 'strict -$[*]';
+
+-- unwrapping of operator arguments in lax mode
+select jsonb_path_query('{"a": [2]}', 'lax $.a * 3');
+select jsonb_path_query('{"a": [2]}', 'lax $.a + 3');
+select jsonb_path_query('{"a": [2, 3, 4]}', 'lax -$.a');
+-- should fail
+select jsonb_path_query('{"a": [1, 2]}', 'lax $.a * 3');
+
+-- extension: boolean expressions
+select jsonb_path_query('2', '$ > 1');
+select jsonb_path_query('2', '$ <= 1');
+select jsonb_path_query('2', '$ == "2"');
+select jsonb '2' @? '$ == "2"';
+
+select jsonb '2' @@ '$ > 1';
+select jsonb '2' @@ '$ <= 1';
+select jsonb '2' @@ '$ == "2"';
+select jsonb '2' @@ '1';
+select jsonb '{}' @@ '$';
+select jsonb '[]' @@ '$';
+select jsonb '[1,2,3]' @@ '$[*]';
+select jsonb '[]' @@ '$[*]';
+select jsonb_path_match('[[1, true], [2, false]]', 'strict $[*] ? (@[0] > $x) [1]', '{"x": 1}');
+select jsonb_path_match('[[1, true], [2, false]]', 'strict $[*] ? (@[0] < $x) [1]', '{"x": 2}');
+
+select jsonb_path_query('[null,1,true,"a",[],{}]', '$.type()');
+select jsonb_path_query('[null,1,true,"a",[],{}]', 'lax $.type()');
+select jsonb_path_query('[null,1,true,"a",[],{}]', '$[*].type()');
+select jsonb_path_query('null', 'null.type()');
+select jsonb_path_query('null', 'true.type()');
+select jsonb_path_query('null', '123.type()');
+select jsonb_path_query('null', '"123".type()');
+
+select jsonb_path_query('{"a": 2}', '($.a - 5).abs() + 10');
+select jsonb_path_query('{"a": 2.5}', '-($.a * $.a).floor() % 4.3');
+select jsonb_path_query('[1, 2, 3]', '($[*] > 2) ? (@ == true)');
+select jsonb_path_query('[1, 2, 3]', '($[*] > 3).type()');
+select jsonb_path_query('[1, 2, 3]', '($[*].a > 3).type()');
+select jsonb_path_query('[1, 2, 3]', 'strict ($[*].a > 3).type()');
+
+select jsonb_path_query('[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]', 'strict $[*].size()');
+select jsonb_path_query('[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]', 'lax $[*].size()');
+
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].abs()');
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].floor()');
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].ceiling()');
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].ceiling().abs()');
+select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].ceiling().abs().type()');
+
+select jsonb_path_query('[{},1]', '$[*].keyvalue()');
+select jsonb_path_query('{}', '$.keyvalue()');
+select jsonb_path_query('{"a": 1, "b": [1, 2], "c": {"a": "bbb"}}', '$.keyvalue()');
+select jsonb_path_query('[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]', '$[*].keyvalue()');
+select jsonb_path_query('[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]', 'strict $.keyvalue()');
+select jsonb_path_query('[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]', 'lax $.keyvalue()');
+select jsonb_path_query('[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]', 'strict $.keyvalue().a');
+select jsonb '{"a": 1, "b": [1, 2]}' @? 'lax $.keyvalue()';
+select jsonb '{"a": 1, "b": [1, 2]}' @? 'lax $.keyvalue().key';
+
+select jsonb_path_query('null', '$.double()');
+select jsonb_path_query('true', '$.double()');
+select jsonb_path_query('[]', '$.double()');
+select jsonb_path_query('[]', 'strict $.double()');
+select jsonb_path_query('{}', '$.double()');
+select jsonb_path_query('1.23', '$.double()');
+select jsonb_path_query('"1.23"', '$.double()');
+select jsonb_path_query('"1.23aaa"', '$.double()');
+select jsonb_path_query('"nan"', '$.double()');
+select jsonb_path_query('"NaN"', '$.double()');
+select jsonb_path_query('"inf"', '$.double()');
+select jsonb_path_query('"-inf"', '$.double()');
+
+select jsonb_path_query('{}', '$.abs()');
+select jsonb_path_query('true', '$.floor()');
+select jsonb_path_query('"1.2"', '$.ceiling()');
+
+select jsonb_path_query('["", "a", "abc", "abcabc"]', '$[*] ? (@ starts with "abc")');
+select jsonb_path_query('["", "a", "abc", "abcabc"]', 'strict $ ? (@[*] starts with "abc")');
+select jsonb_path_query('["", "a", "abd", "abdabc"]', 'strict $ ? (@[*] starts with "abc")');
+select jsonb_path_query('["abc", "abcabc", null, 1]', 'strict $ ? (@[*] starts with "abc")');
+select jsonb_path_query('["abc", "abcabc", null, 1]', 'strict $ ? ((@[*] starts with "abc") is unknown)');
+select jsonb_path_query('[[null, 1, "abc", "abcabc"]]', 'lax $ ? (@[*] starts with "abc")');
+select jsonb_path_query('[[null, 1, "abd", "abdabc"]]', 'lax $ ? ((@[*] starts with "abc") is unknown)');
+select jsonb_path_query('[null, 1, "abd", "abdabc"]', 'lax $[*] ? ((@ starts with "abc") is unknown)');
+
+select jsonb_path_query('[null, 1, "abc", "abd", "aBdC", "abdacb", "adc\nabc", "babc"]', 'lax $[*] ? (@ like_regex "^ab.*c")');
+select jsonb_path_query('[null, 1, "abc", "abd", "aBdC", "abdacb", "adc\nabc", "babc"]', 'lax $[*] ? (@ like_regex "^a  b.*  c " flag "ix")');
+select jsonb_path_query('[null, 1, "abc", "abd", "aBdC", "abdacb", "adc\nabc", "babc"]', 'lax $[*] ? (@ like_regex "^ab.*c" flag "m")');
+select jsonb_path_query('[null, 1, "abc", "abd", "aBdC", "abdacb", "adc\nabc", "babc"]', 'lax $[*] ? (@ like_regex "^ab.*c" flag "s")');
+
+-- jsonpath operators
+
+SELECT jsonb_path_query('[{"a": 1}, {"a": 2}]', '$[*]');
+SELECT jsonb_path_query('[{"a": 1}, {"a": 2}]', '$[*] ? (@.a > 10)');
+
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}, {}]', 'strict $[*].a');
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}]', '$[*].a');
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}]', '$[*].a ? (@ == 1)');
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}]', '$[*].a ? (@ > 10)');
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*].a ? (@ > $min && @ < $max)', '{"min": 1, "max": 4}');
+SELECT jsonb_path_query_array('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*].a ? (@ > $min && @ < $max)', '{"min": 3, "max": 4}');
+
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}, {}]', 'strict $[*].a');
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}]', '$[*].a');
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}]', '$[*].a ? (@ == 1)');
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}]', '$[*].a ? (@ > 10)');
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*].a ? (@ > $min && @ < $max)', '{"min": 1, "max": 4}');
+SELECT jsonb_path_query_first('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*].a ? (@ > $min && @ < $max)', '{"min": 3, "max": 4}');
+
+SELECT jsonb '[{"a": 1}, {"a": 2}]' @? '$[*].a ? (@ > 1)';
+SELECT jsonb '[{"a": 1}, {"a": 2}]' @? '$[*] ? (@.a > 2)';
+SELECT jsonb_path_exists('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*] ? (@.a > $min && @.a < $max)', '{"min": 1, "max": 4}');
+SELECT jsonb_path_exists('[{"a": 1}, {"a": 2}, {"a": 3}, {"a": 5}]', '$[*] ? (@.a > $min && @.a < $max)', '{"min": 3, "max": 4}');
+
+SELECT jsonb '[{"a": 1}, {"a": 2}]' @@ '$[*].a > 1';
+SELECT jsonb '[{"a": 1}, {"a": 2}]' @@ '$[*].a > 2';
diff --git a/src/test/regress/sql/jsonpath.sql b/src/test/regress/sql/jsonpath.sql
new file mode 100644
index 0000000..e5f3391
--- /dev/null
+++ b/src/test/regress/sql/jsonpath.sql
@@ -0,0 +1,147 @@
+--jsonpath io
+
+select ''::jsonpath;
+select '$'::jsonpath;
+select 'strict $'::jsonpath;
+select 'lax $'::jsonpath;
+select '$.a'::jsonpath;
+select '$.a.v'::jsonpath;
+select '$.a.*'::jsonpath;
+select '$.*[*]'::jsonpath;
+select '$.a[*]'::jsonpath;
+select '$.a[*][*]'::jsonpath;
+select '$[*]'::jsonpath;
+select '$[0]'::jsonpath;
+select '$[*][0]'::jsonpath;
+select '$[*].a'::jsonpath;
+select '$[*][0].a.b'::jsonpath;
+select '$.a.**.b'::jsonpath;
+select '$.a.**{2}.b'::jsonpath;
+select '$.a.**{2 to 2}.b'::jsonpath;
+select '$.a.**{2 to 5}.b'::jsonpath;
+select '$.a.**{0 to 5}.b'::jsonpath;
+select '$.a.**{5 to last}.b'::jsonpath;
+select '$.a.**{last}.b'::jsonpath;
+select '$.a.**{last to 5}.b'::jsonpath;
+select '$+1'::jsonpath;
+select '$-1'::jsonpath;
+select '$--+1'::jsonpath;
+select '$.a/+-1'::jsonpath;
+select '1 * 2 + 4 % -3 != false'::jsonpath;
+
+select '"\b\f\r\n\t\v\"\''\\"'::jsonpath;
+select '''\b\f\r\n\t\v\"\''\\'''::jsonpath;
+select '"\x50\u0067\u{53}\u{051}\u{00004C}"'::jsonpath;
+select '''\x50\u0067\u{53}\u{051}\u{00004C}'''::jsonpath;
+select '$.foo\x50\u0067\u{53}\u{051}\u{00004C}\t\"bar'::jsonpath;
+
+select '$.g ? ($.a == 1)'::jsonpath;
+select '$.g ? (@ == 1)'::jsonpath;
+select '$.g ? (@.a == 1)'::jsonpath;
+select '$.g ? (@.a == 1 || @.a == 4)'::jsonpath;
+select '$.g ? (@.a == 1 && @.a == 4)'::jsonpath;
+select '$.g ? (@.a == 1 || @.a == 4 && @.b == 7)'::jsonpath;
+select '$.g ? (@.a == 1 || !(@.a == 4) && @.b == 7)'::jsonpath;
+select '$.g ? (@.a == 1 || !(@.x >= 123 || @.a == 4) && @.b == 7)'::jsonpath;
+select '$.g ? (@.x >= @[*]?(@.a > "abc"))'::jsonpath;
+select '$.g ? ((@.x >= 123 || @.a == 4) is unknown)'::jsonpath;
+select '$.g ? (exists (@.x))'::jsonpath;
+select '$.g ? (exists (@.x ? (@ == 14)))'::jsonpath;
+select '$.g ? ((@.x >= 123 || @.a == 4) && exists (@.x ? (@ == 14)))'::jsonpath;
+select '$.g ? (+@.x >= +-(+@.a + 2))'::jsonpath;
+
+select '$a'::jsonpath;
+select '$a.b'::jsonpath;
+select '$a[*]'::jsonpath;
+select '$.g ? (@.zip == $zip)'::jsonpath;
+select '$.a[1,2, 3 to 16]'::jsonpath;
+select '$.a[$a + 1, ($b[*]) to -($[0] * 2)]'::jsonpath;
+select '$.a[$.a.size() - 3]'::jsonpath;
+select 'last'::jsonpath;
+select '"last"'::jsonpath;
+select '$.last'::jsonpath;
+select '$ ? (last > 0)'::jsonpath;
+select '$[last]'::jsonpath;
+select '$[$[0] ? (last > 0)]'::jsonpath;
+
+select 'null.type()'::jsonpath;
+select '1.type()'::jsonpath;
+select '"aaa".type()'::jsonpath;
+select 'true.type()'::jsonpath;
+select '$.double().floor().ceiling().abs()'::jsonpath;
+select '$.keyvalue().key'::jsonpath;
+
+select '$ ? (@ starts with "abc")'::jsonpath;
+select '$ ? (@ starts with $var)'::jsonpath;
+
+select '$ ? (@ like_regex "(invalid pattern")'::jsonpath;
+select '$ ? (@ like_regex "pattern")'::jsonpath;
+select '$ ? (@ like_regex "pattern" flag "")'::jsonpath;
+select '$ ? (@ like_regex "pattern" flag "i")'::jsonpath;
+select '$ ? (@ like_regex "pattern" flag "is")'::jsonpath;
+select '$ ? (@ like_regex "pattern" flag "isim")'::jsonpath;
+select '$ ? (@ like_regex "pattern" flag "xsms")'::jsonpath;
+select '$ ? (@ like_regex "pattern" flag "a")'::jsonpath;
+
+select '$ < 1'::jsonpath;
+select '($ < 1) || $.a.b <= $x'::jsonpath;
+select '@ + 1'::jsonpath;
+
+select '($).a.b'::jsonpath;
+select '($.a.b).c.d'::jsonpath;
+select '($.a.b + -$.x.y).c.d'::jsonpath;
+select '(-+$.a.b).c.d'::jsonpath;
+select '1 + ($.a.b + 2).c.d'::jsonpath;
+select '1 + ($.a.b > 2).c.d'::jsonpath;
+select '($)'::jsonpath;
+select '(($))'::jsonpath;
+select '((($ + 1)).a + ((2)).b ? ((((@ > 1)) || (exists(@.c)))))'::jsonpath;
+
+select '$ ? (@.a < 1)'::jsonpath;
+select '$ ? (@.a < -1)'::jsonpath;
+select '$ ? (@.a < +1)'::jsonpath;
+select '$ ? (@.a < .1)'::jsonpath;
+select '$ ? (@.a < -.1)'::jsonpath;
+select '$ ? (@.a < +.1)'::jsonpath;
+select '$ ? (@.a < 0.1)'::jsonpath;
+select '$ ? (@.a < -0.1)'::jsonpath;
+select '$ ? (@.a < +0.1)'::jsonpath;
+select '$ ? (@.a < 10.1)'::jsonpath;
+select '$ ? (@.a < -10.1)'::jsonpath;
+select '$ ? (@.a < +10.1)'::jsonpath;
+select '$ ? (@.a < 1e1)'::jsonpath;
+select '$ ? (@.a < -1e1)'::jsonpath;
+select '$ ? (@.a < +1e1)'::jsonpath;
+select '$ ? (@.a < .1e1)'::jsonpath;
+select '$ ? (@.a < -.1e1)'::jsonpath;
+select '$ ? (@.a < +.1e1)'::jsonpath;
+select '$ ? (@.a < 0.1e1)'::jsonpath;
+select '$ ? (@.a < -0.1e1)'::jsonpath;
+select '$ ? (@.a < +0.1e1)'::jsonpath;
+select '$ ? (@.a < 10.1e1)'::jsonpath;
+select '$ ? (@.a < -10.1e1)'::jsonpath;
+select '$ ? (@.a < +10.1e1)'::jsonpath;
+select '$ ? (@.a < 1e-1)'::jsonpath;
+select '$ ? (@.a < -1e-1)'::jsonpath;
+select '$ ? (@.a < +1e-1)'::jsonpath;
+select '$ ? (@.a < .1e-1)'::jsonpath;
+select '$ ? (@.a < -.1e-1)'::jsonpath;
+select '$ ? (@.a < +.1e-1)'::jsonpath;
+select '$ ? (@.a < 0.1e-1)'::jsonpath;
+select '$ ? (@.a < -0.1e-1)'::jsonpath;
+select '$ ? (@.a < +0.1e-1)'::jsonpath;
+select '$ ? (@.a < 10.1e-1)'::jsonpath;
+select '$ ? (@.a < -10.1e-1)'::jsonpath;
+select '$ ? (@.a < +10.1e-1)'::jsonpath;
+select '$ ? (@.a < 1e+1)'::jsonpath;
+select '$ ? (@.a < -1e+1)'::jsonpath;
+select '$ ? (@.a < +1e+1)'::jsonpath;
+select '$ ? (@.a < .1e+1)'::jsonpath;
+select '$ ? (@.a < -.1e+1)'::jsonpath;
+select '$ ? (@.a < +.1e+1)'::jsonpath;
+select '$ ? (@.a < 0.1e+1)'::jsonpath;
+select '$ ? (@.a < -0.1e+1)'::jsonpath;
+select '$ ? (@.a < +0.1e+1)'::jsonpath;
+select '$ ? (@.a < 10.1e+1)'::jsonpath;
+select '$ ? (@.a < -10.1e+1)'::jsonpath;
+select '$ ? (@.a < +10.1e+1)'::jsonpath;
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index f422503..726f2ba 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -179,6 +179,8 @@ sub mkvcbuild
 		'src/backend/replication', 'repl_scanner.l',
 		'repl_gram.y',             'syncrep_scanner.l',
 		'syncrep_gram.y');
+	$postgres->AddFiles('src/backend/utils/adt', 'jsonpath_scan.l',
+		'jsonpath_gram.y');
 	$postgres->AddDefine('BUILDING_DLL');
 	$postgres->AddLibrary('secur32.lib');
 	$postgres->AddLibrary('ws2_32.lib');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 2ea224d..90a8d69 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -327,6 +327,24 @@ sub GenerateFiles
 		);
 	}
 
+	if (IsNewer(
+			'src/backend/utils/adt/jsonpath_gram.h',
+			'src/backend/utils/adt/jsonpath_gram.y'))
+	{
+		print "Generating jsonpath_gram.h...\n";
+		chdir('src/backend/utils/adt');
+		system('perl ../../../tools/msvc/pgbison.pl jsonpath_gram.y');
+		chdir('../../../..');
+	}
+
+	if (IsNewer(
+			'src/include/utils/jsonpath_gram.h',
+			'src/backend/utils/adt/jsonpath_gram.h'))
+	{
+		copyFile('src/backend/utils/adt/jsonpath_gram.h',
+			'src/include/utils/jsonpath_gram.h');
+	}
+
 	if ($self->{options}->{python}
 		&& IsNewer(
 			'src/pl/plpython/spiexceptions.h',
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 3d3c76d..daaafa3 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -1095,14 +1095,31 @@ JoinType
 JsObject
 JsValue
 JsonAggState
+JsonBaseObjectInfo
 JsonHashEntry
+JsonItemStack
+JsonItemStackEntry
 JsonIterateStringValuesAction
 JsonLexContext
+JsonLikeRegexContext
 JsonParseContext
+JsonPath
+JsonPathBool
+JsonPathExecContext
+JsonPathExecResult
+JsonPathItem
+JsonPathItemType
+JsonPathParseItem
+JsonPathParseResult
+JsonPathPredicateCallback
+JsonPathVariable
+JsonPathVariable_cb
 JsonSemAction
 JsonTokenType
 JsonTransformStringValuesAction
 JsonTypeCategory
+JsonValueList
+JsonValueListIterator
 Jsonb
 JsonbAggState
 JsonbContainer
-- 
2.7.4

--------------FD6F0D8EDD0CFB174B99F31A
Content-Type: text/x-patch;
 name="0002-Suppression-of-numeric-errors-in-jsonpath-v34.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="0002-Suppression-of-numeric-errors-in-jsonpath-v34.patch"