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Allow ALTER TYPE to update an existing type's typsubscript value.

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This is essential if we'd like to allow existing extension data types
to support subscripting in future, since dropping and recreating the
type isn't a practical thing for an extension upgrade script, and
direct manipulation of pg_type isn't a great answer either.

There was some discussion about also allowing alteration of typelem,
but it's less clear whether that's a good idea or not, so for now
I forebore.

Discussion: https://postgr.es/m/3724341.1607551174@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2020-12-11 18:07:02 -05:00
parent 653aa603f5
commit 8c15a29745
4 changed files with 54 additions and 22 deletions
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8
doc/src/sgml/ref/alter_type.sgml
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@ -194,6 +194,14 @@ ALTER TYPE <replaceable class="parameter">name</replaceable> SET ( <replaceable
requires superuser privilege.
</para>
</listitem>
<listitem>
<para>
<literal>SUBSCRIPT</literal> can be set to the name of a type-specific
subscripting handler function, or <literal>NONE</literal> to remove
the type's subscripting handler function. Using this option
requires superuser privilege.
</para>
</listitem>
<listitem>
<para>
<literal>STORAGE</literal><indexterm>