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Allow statistics to be collected for foreign tables.

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ANALYZE now accepts foreign tables and allows the table's FDW to control
how the sample rows are collected.  (But only manual ANALYZEs will touch
foreign tables, for the moment, since among other things it's not very
clear how to handle remote permissions checks in an auto-analyze.)

contrib/file_fdw is extended to support this.

Etsuro Fujita, reviewed by Shigeru Hanada, some further tweaking by me.
This commit is contained in:
Tom Lane
2012-04-06 15:02:35 -04:00
parent 8cb53654db
commit 263d9de66b
13 changed files with 486 additions and 101 deletions
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10
doc/src/sgml/ref/analyze.sgml
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@@ -63,7 +63,8 @@ ANALYZE [ VERBOSE ] [ <replaceable class="PARAMETER">table</replaceable> [ ( <re
<listitem>
<para>
The name (possibly schema-qualified) of a specific table to
analyze. Defaults to all tables in the current database.
analyze. If omitted, all regular tables (but not foreign tables)
in the current database are analyzed.
</para>
</listitem>
</varlistentry>
@@ -92,6 +93,13 @@ ANALYZE [ VERBOSE ] [ <replaceable class="PARAMETER">table</replaceable> [ ( <re
<refsect1>
<title>Notes</title>
<para>
Foreign tables are analyzed only when explicitly selected. Not all
foreign data wrappers support <command>ANALYZE</>. If the table's
wrapper does not support <command>ANALYZE</>, the command prints a
warning and does nothing.
</para>
<para>
In the default <productname>PostgreSQL</productname> configuration,
the autovacuum daemon (see <xref linkend="autovacuum">)