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

From:	Bruce Momjian <bruce(at)momjian(dot)us>
To:	pgsql-committers(at)lists(dot)postgresql(dot)org
Subject:	pgsql: doc: PG 12 relnotes, add mention of single-child optimization
Date:	2019-06-14 13:30:35
Message-ID:	E1hbmHr-0002EI-8U@gemulon.postgresql.org
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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

Branch
------
master

Modified Files
--------------
doc/src/sgml/release-12.sgml | 12 ++++++++++++
1 file changed, 12 insertions(+)

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