pgsql: Include TableFunc references when computing expression dependenc

Include TableFunc references when computing expression dependencies.

The TableFunc node (i.e., XMLTABLE) includes type and collation OIDs
that might not be referenced anywhere else in the expression tree,
so they need to be accounted for when extracting dependencies.

Fortunately, the practical effects of this are limited, since
(a) it's somewhat unlikely that people would be extracting
columns of non-builtin types from an XML document, and (b)
in many scenarios, the query would contain other references
to such types, or functions depending on them.  However, it's
not hard to construct examples wherein the existing code lets
one drop a type used in XMLTABLE and thereby break a view.

This is evidently an original oversight in the XMLTABLE patch,
so back-patch to v10 where that came in.

Discussion: https://postgr.es/m/18427.1573508501@sss.pgh.pa.us

Branch
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REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/94a9cb43ff5a84b25a3e7d5226c8e02d55fe69c3

Modified Files
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src/backend/catalog/dependency.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)