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Split QTW_EXAMINE_RTES flag into QTW_EXAMINE_RTES_BEFORE/_AFTER.

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This change allows callers of query_tree_walker() to choose whether
to visit an RTE before or after visiting the contents of the RTE
(i.e., prefix or postfix tree order).  All existing users of
QTW_EXAMINE_RTES want the QTW_EXAMINE_RTES_BEFORE behavior, but
an upcoming patch will want QTW_EXAMINE_RTES_AFTER, and it seems
like a potentially useful change on its own.

Andreas Karlsson (extracted from CTE inlining patch)

Discussion: https://postgr.es/m/8810.1542402910@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2019-01-25 17:09:45 -05:00
parent ff750ce2d8
commit 18c0da88a5
4 changed files with 21 additions and 10 deletions
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4
src/backend/optimizer/plan/setrefs.c
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@ -340,7 +340,7 @@ flatten_unplanned_rtes(PlannerGlobal *glob, RangeTblEntry *rte)
(void) query_tree_walker(rte->subquery,
flatten_rtes_walker,
(void *) glob,
QTW_EXAMINE_RTES);
QTW_EXAMINE_RTES_BEFORE);
}
static bool
@ -363,7 +363,7 @@ flatten_rtes_walker(Node *node, PlannerGlobal *glob)
return query_tree_walker((Query *) node,
flatten_rtes_walker,
(void *) glob,
QTW_EXAMINE_RTES);
QTW_EXAMINE_RTES_BEFORE);
}
return expression_tree_walker(node, flatten_rtes_walker,
(void *) glob);