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(parent: 9c72736) | patch

Remove artificial restrictions on which node types have out/read funcs.

Remove artificial restrictions on which node types have out/read funcs.

The initial version of gen_node_support.pl manually excluded most
utility statement node types from having out/read support, and
also some raw-parse-tree-only node types. That was mostly to keep
the output comparable to the old hand-maintained code. We'd like
to have out/read support for utility statements, for debugging
purposes and so that they can be included in new-style SQL functions;
so it's time to lift that restriction.

Most if not all of the previously-excluded raw-parse-tree-only node
types can appear in expression subtrees of utility statements, so
they have to be handled too.

We don't quite have full read support yet; certain custom_read_write
node types need to have their handwritten read functions implemented
before that will work.

Doing this allows us to drop the previous hack in _outQuery to not
dump the utilityStmt field in most cases, which means we no longer
need manually-maintained out/read functions for Query, so get rid
of those in favor of auto-generating them.

Fix a couple of omissions in gen_node_support.pl that are exposed
through having to handle more node types.

catversion bump forced because somebody was sloppy about the field
order in the manually-maintained Query out/read functions.
(Committers should note that almost all changes in parsenodes.h
are now grounds for a catversion bump.)

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