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Simplify LATERAL-related calculations within add_paths_to_joinrel().

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While convincing myself that commit 7e19db0c09 would solve both of
the problems recently reported by Andreas Seltenreich, I realized that
add_paths_to_joinrel's handling of LATERAL restrictions could be made
noticeably simpler and faster if we were to retain the minimum possible
parameterization for each joinrel (that is, the set of relids supplying
unsatisfied lateral references in it).  We already retain that for
baserels, in RelOptInfo.lateral_relids, so we can use that field for
joinrels too.

This is a back-port of commit edca44b152.
I originally intended not to back-patch that, but additional hacking
in this area turns out to be needed, making it necessary not optional
to compute lateral_relids for joinrels.  In preparation for those fixes,
sync the relevant code with HEAD as much as practical.  (I did not risk
rearranging fields of RelOptInfo in released branches, however.)
This commit is contained in:
Tom Lane
2015-12-09 18:54:25 -05:00
parent 4acee11e66
commit c3c5c02881
4 changed files with 24 additions and 67 deletions
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2
src/backend/nodes/outfuncs.c
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@@ -1858,13 +1858,13 @@ _outRelOptInfo(StringInfo str, const RelOptInfo *node)
WRITE_NODE_FIELD(cheapest_total_path);
WRITE_NODE_FIELD(cheapest_unique_path);
WRITE_NODE_FIELD(cheapest_parameterized_paths);
WRITE_BITMAPSET_FIELD(lateral_relids);
WRITE_UINT_FIELD(relid);
WRITE_OID_FIELD(reltablespace);
WRITE_ENUM_FIELD(rtekind, RTEKind);
WRITE_INT_FIELD(min_attr);
WRITE_INT_FIELD(max_attr);
WRITE_NODE_FIELD(lateral_vars);
WRITE_BITMAPSET_FIELD(lateral_relids);
WRITE_BITMAPSET_FIELD(lateral_referencers);
WRITE_NODE_FIELD(indexlist);
WRITE_UINT_FIELD(pages);