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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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7
src/include/nodes/nodeFuncs.h
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@@ -22,8 +22,11 @@
#define QTW_IGNORE_RC_SUBQUERIES 0x03 /* both of above */
#define QTW_IGNORE_JOINALIASES 0x04 /* JOIN alias var lists */
#define QTW_IGNORE_RANGE_TABLE 0x08 /* skip rangetable entirely */
#define QTW_EXAMINE_RTES 0x10 /* examine RTEs */
#define QTW_DONT_COPY_QUERY 0x20 /* do not copy top Query */
#define QTW_EXAMINE_RTES_BEFORE 0x10 /* examine RTE nodes before their
* contents */
#define QTW_EXAMINE_RTES_AFTER 0x20 /* examine RTE nodes after their
* contents */
#define QTW_DONT_COPY_QUERY 0x40 /* do not copy top Query */
/* callback function for check_functions_in_node */
typedef bool (*check_function_callback) (Oid func_id, void *context);