postgres.git / summary / log / commit / refs
commit 4f33af23e7e3ac30b3cb9480981c3accf401ef01
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon Nov 29 17:13:12 2021 +0000
First released in: 15.0, 10.20, 11.15, 12.10, 13.6, 14.2
Doc: improve documentation about ORDER BY in matviews.
Remove the confusing use of ORDER BY in an example materialized
view. It adds nothing to the example, but might encourage
people to follow bad practice. Clarify REFRESH MATERIALIZED
VIEW's note about whether view ordering is retained (it isn't).
Maciek Sakrejda
Discussion: https://postgr.es/m/CAOtHd0D-OvrUU0C=4hX28p4BaSE1XL78BAQ0VcDaLLt8tdUzsg@mail.gmail.com
doc/src/sgml/ref/refresh_materialized_view.sgml | 10 ++++------
doc/src/sgml/rules.sgml | 3 ---
2 files changed, 4 insertions(+), 9 deletions(-)
diff --git a/doc/src/sgml/ref/refresh_materialized_view.sgml b/doc/src/sgml/ref/refresh_materialized_view.sgml
index 3bf88844478..675d6090f3c 100644
--- a/doc/src/sgml/ref/refresh_materialized_view.sgml
+++ b/doc/src/sgml/ref/refresh_materialized_view.sgml
@@ -93,12 +93,10 @@ REFRESH MATERIALIZED VIEW [ CONCURRENTLY ] <replaceable class="parameter">name</
<title>Notes</title>
<para>
- While the default index for future
- <link linkend="sql-cluster"><command>CLUSTER</command></link>
- operations is retained, <command>REFRESH MATERIALIZED VIEW</command> does not
- order the generated rows based on this property. If you want the data
- to be ordered upon generation, you must use an <literal>ORDER BY</literal>
- clause in the backing query.
+ If there is an <literal>ORDER BY</literal> clause in the materialized
+ view's defining query, the original contents of the materialized view
+ will be ordered that way; but <command>REFRESH MATERIALIZED
+ VIEW</command> does not guarantee to preserve that ordering.
</para>
</refsect1>
diff --git a/doc/src/sgml/rules.sgml b/doc/src/sgml/rules.sgml
index 6065b1c2a31..4aa4e00e017 100644
--- a/doc/src/sgml/rules.sgml
+++ b/doc/src/sgml/rules.sgml
@@ -961,9 +961,6 @@ CREATE MATERIALIZED VIEW sales_summary AS
FROM invoice
WHERE invoice_date < CURRENT_DATE
GROUP BY
- seller_no,
- invoice_date
- ORDER BY
seller_no,
invoice_date;
[parent: e04a8059a74c]