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0339047bc9
Fix loss of previous expression-simplification work when a transform function fires: we must not simply revert to untransformed input tree. Instead build a dummy FuncExpr node to pass to the transform function. This has the additional advantage of providing a simpler, more uniform API for transform functions. Move documentation to a somewhat less buried spot, relocate some poorly-placed code, be more wary of null constants and invalid typmod values, add an opr_sanity check on protransform function signatures, and some other minor cosmetic adjustments. Note: although this patch touches pg_proc.h, no need for catversion bump, because the changes are cosmetic and don't actually change the intended catalog contents.
66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* nodeFuncs.h
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* Various general-purpose manipulations of Node trees
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*
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* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/nodes/nodeFuncs.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NODEFUNCS_H
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#define NODEFUNCS_H
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#include "nodes/parsenodes.h"
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/* flags bits for query_tree_walker and query_tree_mutator */
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#define QTW_IGNORE_RT_SUBQUERIES 0x01 /* subqueries in rtable */
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#define QTW_IGNORE_CTE_SUBQUERIES 0x02 /* subqueries in cteList */
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#define QTW_IGNORE_RC_SUBQUERIES 0x03 /* both of above */
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#define QTW_IGNORE_JOINALIASES 0x04 /* JOIN alias var lists */
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#define QTW_IGNORE_RANGE_TABLE 0x08 /* skip rangetable entirely */
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#define QTW_EXAMINE_RTES 0x10 /* examine RTEs */
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#define QTW_DONT_COPY_QUERY 0x20 /* do not copy top Query */
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extern Oid exprType(const Node *expr);
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extern int32 exprTypmod(const Node *expr);
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extern bool exprIsLengthCoercion(const Node *expr, int32 *coercedTypmod);
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extern Node *relabel_to_typmod(Node *expr, int32 typmod);
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extern bool expression_returns_set(Node *clause);
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extern Oid exprCollation(const Node *expr);
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extern Oid exprInputCollation(const Node *expr);
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extern void exprSetCollation(Node *expr, Oid collation);
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extern void exprSetInputCollation(Node *expr, Oid inputcollation);
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extern int exprLocation(const Node *expr);
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extern bool expression_tree_walker(Node *node, bool (*walker) (),
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void *context);
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extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (),
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void *context);
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extern bool query_tree_walker(Query *query, bool (*walker) (),
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void *context, int flags);
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extern Query *query_tree_mutator(Query *query, Node *(*mutator) (),
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void *context, int flags);
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extern bool range_table_walker(List *rtable, bool (*walker) (),
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void *context, int flags);
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extern List *range_table_mutator(List *rtable, Node *(*mutator) (),
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void *context, int flags);
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extern bool query_or_expression_tree_walker(Node *node, bool (*walker) (),
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void *context, int flags);
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extern Node *query_or_expression_tree_mutator(Node *node, Node *(*mutator) (),
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void *context, int flags);
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extern bool raw_expression_tree_walker(Node *node, bool (*walker) (),
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void *context);
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#endif /* NODEFUNCS_H */
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