pgsql: Correctly update hasSubLinks while mutating a rule action.

Correctly update hasSubLinks while mutating a rule action.

rewriteRuleAction neglected to check for SubLink nodes in the
securityQuals of range table entries.  This could lead to failing
to convert such a SubLink to a SubPlan, resulting in assertion
crashes or weird errors later in planning.

In passing, fix some poor coding in rewriteTargetView:
we should not pass the source parsetree's hasSubLinks
field to ReplaceVarsFromTargetList's outer_hasSubLinks.
ReplaceVarsFromTargetList knows enough to ignore that
when a Query node is passed, but it's still confusing
and bad precedent: if we did try to update that flag
we'd be updating a stale copy of the parsetree.

Per bug #17972 from Alexander Lakhin.  This has been broken since
we added RangeTblEntry.securityQuals (although the presented test
case only fails back to 215b43cdc), so back-patch all the way.

Discussion: https://postgr.es/m/17972-f422c094237847d0@postgresql.org

Branch
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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/b4110bdbfe9d3cede772e1f37f9a7467e63e158b

Modified Files
--------------
src/backend/rewrite/rewriteHandler.c          |  4 +++-
src/test/regress/expected/updatable_views.out | 32 +++++++++++++++++++++++++++
src/test/regress/sql/updatable_views.sql      | 17 ++++++++++++++
3 files changed, 52 insertions(+), 1 deletion(-)