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Make stxstattarget nullable

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To match attstattarget change (commit 4f622503d6).  The logic inside
CreateStatistics() is clarified a bit compared to that previous patch,
and so here we also update ATExecSetStatistics() to match.

Reviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/4da8d211-d54d-44b9-9847-f2a9f1184c76@eisentraut.org
This commit is contained in:
Peter Eisentraut
2024-03-17 12:22:05 +01:00
parent 33e729c514
commit 012460ee93
11 changed files with 96 additions and 73 deletions
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11
doc/src/sgml/ref/alter_statistics.sgml
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@@ -26,7 +26,7 @@ PostgreSQL documentation
ALTER STATISTICS <replaceable class="parameter">name</replaceable> OWNER TO { <replaceable class="parameter">new_owner</replaceable> | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER STATISTICS <replaceable class="parameter">name</replaceable> RENAME TO <replaceable class="parameter">new_name</replaceable>
ALTER STATISTICS <replaceable class="parameter">name</replaceable> SET SCHEMA <replaceable class="parameter">new_schema</replaceable>
ALTER STATISTICS <replaceable class="parameter">name</replaceable> SET STATISTICS <replaceable class="parameter">new_target</replaceable>
ALTER STATISTICS <replaceable class="parameter">name</replaceable> SET STATISTICS { <replaceable class="parameter">new_target</replaceable> | DEFAULT }
</synopsis>
</refsynopsisdiv>
@@ -101,10 +101,11 @@ ALTER STATISTICS <replaceable class="parameter">name</replaceable> SET STATISTIC
<para>
The statistic-gathering target for this statistics object for subsequent
<link linkend="sql-analyze"><command>ANALYZE</command></link> operations.
The target can be set in the range 0 to 10000; alternatively, set it
to -1 to revert to using the maximum of the statistics target of the
referenced columns, if set, or the system default statistics
target (<xref linkend="guc-default-statistics-target"/>).
The target can be set in the range 0 to 10000. Set it to
<literal>DEFAULT</literal> to revert to using the system default
statistics target (<xref linkend="guc-default-statistics-target"/>).
(Setting to a value of -1 is an obsolete way spelling to get the same
outcome.)
For more information on the use of statistics by the
<productname>PostgreSQL</productname> query planner, refer to
<xref linkend="planner-stats"/>.