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docs: PG 12 relnote adjustments based on feedback from Tom Lane 

Discussion: https://postgr.es/m/22793.1558399695@sss.pgh.pa.us
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Bruce Momjian 2019-05-21 16:45:48 -04:00
parent 3468a04a3e
commit 8e719d33fd
1 changed files with 9 additions and 20 deletions
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doc/src/sgml/release-12.sgml
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@ -597,12 +597,9 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>
-->
<para>
Improve handling of partition dependency (Tom Lane)
</para>
<para>
This prevents the creation of inconsistent partition hierarchies
in rare cases.
Fix bugs that could cause <command>ALTER TABLE DETACH
PARTITION</command> to not drop objects that should be dropped,
such as automatically-created child indexes (Tom Lane)
</para>
</listitem>
@ -831,28 +828,20 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-09 [1fb57af92] Create the infrastructure for planner support functions.
-->
<para>
Add support for <link linkend="sql-createfunction">function
selectivity</link> (Tom Lane)
</para>
</listitem>
<listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-09 [a391ff3c3] Build out the planner support function infrastructure.
-->
<para>
Use the new support function capability to improve optimizer
estimates for some functions (Tom Lane)
Add support function capability to improve optimizer estimates
for functions (Tom Lane)
</para>
<para>
Specifically, improve them for
<function>generate_series()</function>,
This allows extensions to create planner support functions that
can provide function-specific selectivity, cost, and row-count
estimates that can depend on the function arguments. Also, improve
in-core estimates for <function>generate_series()</function>,
<function>unnest()</function>, and functions that return boolean
values.
</para>