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Add to_regtypemod function to extract typemod from a string type name.
In combination with to_regtype, this allows converting a string to
the "canonicalized" form emitted by format_type. That usage requires
parsing the string twice, which is slightly annoying but not really
too expensive. We considered alternatives such as returning a record
type, but that way was notationally uglier than this, and possibly
less flexible.
Like to_regtype(), we'd rather that this return NULL for any bad
input, but the underlying type-parsing logic isn't yet capable of
not throwing syntax errors. Adjust the documentation for both
functions to point that out.
In passing, fix up a couple of nearby entries in the System Catalog
Information Functions table that had not gotten the word about our
since-v13 convention for displaying function usage examples.
David Wheeler and Erik Wienhold, reviewed by Pavel Stehule, Jim Jones,
and others.
Discussion: https://postgr.es/m/DF2324CA-2673-4ABE-B382-26B5770B6AA3@justatheory.com
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