<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

-->

</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>