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docs: PG 12 release notes, support functions 

Move support function mention to the proper section, and reword.

Reported-by: Tom Lane

Discussion: https://postgr.es/m/5121.1558472431@sss.pgh.pa.us
This commit is contained in:
Bruce Momjian 2019-05-22 11:22:13 -04:00
parent ba95a69336
commit 728840fe13
1 changed files with 22 additions and 23 deletions
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45
doc/src/sgml/release-12.sgml
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@ -832,29 +832,6 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>
<listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-09 [1fb57af92] Create the infrastructure for planner support functions.
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-09 [a391ff3c3] Build out the planner support function infrastructure.
-->
<para>
Add support function capability to improve optimizer estimates
for functions (Tom Lane)
</para>
<para>
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>
</listitem>
<listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2018-12-13 [04fe805a1] Drop no-op CoerceToDomain nodes from expressions at plan
-->
@ -2898,6 +2875,28 @@ existin
</para>
</listitem>
<listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-09 [1fb57af92] Create the infrastructure for planner support functions.
Author: Tom Lane <tgl@sss.pgh.pa.us>
2019-02-09 [a391ff3c3] Build out the planner support function infrastructure.
-->
<para>
Add support function capability to improve optimizer estimates,
inlining, and indexing for functions (Tom Lane)
</para>
<para>
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's arguments. Support
functions can also supply simplified representations and index
conditions, greatly expanding optimization possibilities.
</para>
</listitem>
<listitem>
<!--
Author: Andres Freund <andres@anarazel.de>