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Commit4b7bba4

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doc: Add better description for rewrite functions in event triggers
There are two functions that can be used in event triggers to get moredetails about a rewrite happening on a relation. Both had a limiteddocumentation:- pg_event_trigger_table_rewrite_reason() andpg_event_trigger_table_rewrite_oid() were not mentioned in the mainevent trigger section in the paragraph dedicated to the eventtable_rewrite.- pg_event_trigger_table_rewrite_reason() returns an integer which is abitmap of the reasons why a rewrite happens. There was no explanationabout the meaning of these values, forcing the reader to look at thecode to find out that these are defined in event_trigger.h.While on it, let's add a comment in event_trigger.h where theAT_REWRITE_* are defined, telling to update the documentation whenthese values are changed.Backpatch down to 13 as a consequence of1ad2333, where this areaof the documentation has been heavily reworked.Author: Greg Sabino MullaneDiscussion:https://postgr.es/m/CAKAnmmL+Z6j-C8dAx1tVrnBmZJu+BSoc68WSg3sR+CVNjBCqbw@mail.gmail.comBackpatch-through: 13
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‎doc/src/sgml/event-trigger.sgml‎

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@@ -104,6 +104,11 @@
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control statements are available to rewrite a table,
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like <literal>CLUSTER</literal> and <literal>VACUUM</literal>,
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the <literal>table_rewrite</literal> event is not triggered by them.
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To find the OID of the table that was rewritten, use the function
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<literal>pg_event_trigger_table_rewrite_oid()</literal> (see
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<xref linkend="functions-event-triggers"/>). To discover the reason(s)
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for the rewrite, use the function
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<literal>pg_event_trigger_table_rewrite_reason()</literal>.
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</para>
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<para>

‎doc/src/sgml/func.sgml‎

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@@ -31687,8 +31687,12 @@ CREATE EVENT TRIGGER test_event_trigger_for_drops
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<returnvalue>integer</returnvalue>
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</para>
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<para>
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Returns a code explaining the reason(s) for rewriting. The exact
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meaning of the codes is release dependent.
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Returns a code explaining the reason(s) for rewriting. The value is
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a bitmap built from the following values: <literal>1</literal>
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(the table has changed its persistence), <literal>2</literal>
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(default value of a column has changed), <literal>4</literal>
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(a column has a new data type) and <literal>8</literal>
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(the table access method has changed).
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</para></entry>
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</row>
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</tbody>

‎src/include/commands/event_trigger.h‎

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externPGDLLIMPORTboolevent_triggers;
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/*
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* Reasons for relation rewrites.
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*
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* pg_event_trigger_table_rewrite_reason() uses these values, so make sure to
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* update the documentation when changing this list.
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*/
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#defineAT_REWRITE_ALTER_PERSISTENCE0x01
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#defineAT_REWRITE_DEFAULT_VAL0x02
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#defineAT_REWRITE_COLUMN_REWRITE0x04

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