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doc: PG 12 relnotes, add mention of single-child optimization 

Add mention of single-child optimization for partitions and UNION ALL.

Reported-by: David Rowley

Discussion: https://postgr.es/m/CAKJS1f8R8riwBXw==7ijV=UZNuhP+3qXgDBKSiM+=_cTf4mXXw@mail.gmail.com
This commit is contained in:
Bruce Momjian 2019-06-14 09:30:31 -04:00
parent 08d2d58a2a
commit b9a0724cf7
1 changed files with 12 additions and 0 deletions
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12
doc/src/sgml/release-12.sgml
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@ -842,6 +842,18 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>
<listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-03-25 [8edd0e794] Suppress Append and MergeAppend plan nodes that have a s
-->
<para>
Improve optimization of partition and <literal>UNION ALL</literal>
queries that have only a single child (David Rowley)
</para>
</listitem>
<listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-13 [04fe805a1] Drop no-op CoerceToDomain nodes from expressions at plan
-->