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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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@ -597,12 +597,9 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>
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Improve handling of partition dependency (Tom Lane)
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Fix bugs that could cause <command>ALTER TABLE DETACH
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PARTITION</command> to not drop objects that should be dropped,
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such as automatically-created child indexes (Tom Lane)
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This prevents the creation of inconsistent partition hierarchies
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in rare cases.
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@ -831,28 +828,20 @@ Author: Tom Lane <tgl@sss.pgh.pa.us>
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<!--
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<!--
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Author: Tom Lane <tgl@sss.pgh.pa.us>
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Author: Tom Lane <tgl@sss.pgh.pa.us>
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2019-02-09 [1fb57af92] Create the infrastructure for planner support functions.
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2019-02-09 [1fb57af92] Create the infrastructure for planner support functions.
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Add support for <link linkend="sql-createfunction">function
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selectivity</link> (Tom Lane)
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<!--
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Author: Tom Lane <tgl@sss.pgh.pa.us>
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Author: Tom Lane <tgl@sss.pgh.pa.us>
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2019-02-09 [a391ff3c3] Build out the planner support function infrastructure.
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2019-02-09 [a391ff3c3] Build out the planner support function infrastructure.
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<para>
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Use the new support function capability to improve optimizer
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Add support function capability to improve optimizer estimates
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estimates for some functions (Tom Lane)
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for functions (Tom Lane)
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Specifically, improve them for
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This allows extensions to create planner support functions that
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<function>generate_series()</function>,
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can provide function-specific selectivity, cost, and row-count
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estimates that can depend on the function arguments. Also, improve
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in-core estimates for <function>generate_series()</function>,
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<function>unnest()</function>, and functions that return boolean
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<function>unnest()</function>, and functions that return boolean
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values.
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values.
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</para>
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</para>
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