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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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6
src/backend/rewrite/rewriteManip.c
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@@ -761,7 +761,7 @@ IncrementVarSublevelsUp_walker(Node *node,
result = query_tree_walker((Query *) node,
IncrementVarSublevelsUp_walker,
(void *) context,
QTW_EXAMINE_RTES);
QTW_EXAMINE_RTES_BEFORE);
context->min_sublevels_up--;
return result;
}
@@ -785,7 +785,7 @@ IncrementVarSublevelsUp(Node *node, int delta_sublevels_up,
query_or_expression_tree_walker(node,
IncrementVarSublevelsUp_walker,
(void *) &context,
QTW_EXAMINE_RTES);
QTW_EXAMINE_RTES_BEFORE);
}
/*
@@ -804,7 +804,7 @@ IncrementVarSublevelsUp_rtable(List *rtable, int delta_sublevels_up,
range_table_walker(rtable,
IncrementVarSublevelsUp_walker,
(void *) &context,
QTW_EXAMINE_RTES);
QTW_EXAMINE_RTES_BEFORE);
}