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From: David E. Wheeler <[email protected]>
To: Tom Lane <[email protected]>
Cc: Erik Rijkers <[email protected]>
Cc: Erik Wienhold <[email protected]>
Cc: [email protected]
Subject: Re: JSON Path and GIN Questions
Date: Fri, 15 Sep 2023 16:13:22 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Sep 14, 2023, at 00:41, Tom Lane <[email protected]> wrote:

> As far as json in particular is concerned, 8.14.4 jsonb Indexing [4]
> is pretty clear about what is or is not supported.

How do you feel about this note, then?

diff --git a/doc/src/sgml/json.sgml b/doc/src/sgml/json.sgml
index b6c2ddbf55..7dda727f0d 100644
--- a/doc/src/sgml/json.sgml
+++ b/doc/src/sgml/json.sgml
@@ -413,6 +413,13 @@ SELECT doc-&gt;'site_name' FROM websites
     Two GIN <quote>operator classes</quote> are provided, offering different
     performance and flexibility trade-offs.
   </para>
+  <note>
+    <para>
+    As with all indexes, only operators on indexed columns are considered as
+    index qualifications. In other words, only <type>jsonb</type> operators can
+    take advantage of GIN indexes; <type>jsonb</type> functions cannot.
+    </para>
+  </note>
   <para>
     The default GIN operator class for <type>jsonb</type> supports queries with
     the key-exists operators <literal>?</literal>, <literal>?|</literal>


Best,

David



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