mirror of
https://git.postgresql.org/git/postgresql.git
synced 2026-02-17 11:57:00 +08:00
b310b6e31c
All expression nodes now have an explicit output-collation field, unless they are known to only return a noncollatable data type (such as boolean or record). Also, nodes that can invoke collation-aware functions store a separate field that is the collation value to pass to the function. This avoids confusion that arises when a function has collatable inputs and noncollatable output type, or vice versa. Also, replace the parser's on-the-fly collation assignment method with a post-pass over the completed expression tree. This allows us to use a more complex (and hopefully more nearly spec-compliant) assignment rule without paying for it in extra storage in every expression node. Fix assorted bugs in the planner's handling of collations by making collation one of the defining properties of an EquivalenceClass and by converting CollateExprs into discardable RelabelType nodes during expression preprocessing.
65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* nodeFuncs.h
|
|
* Various general-purpose manipulations of Node trees
|
|
*
|
|
* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* src/include/nodes/nodeFuncs.h
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef NODEFUNCS_H
|
|
#define NODEFUNCS_H
|
|
|
|
#include "nodes/parsenodes.h"
|
|
|
|
|
|
/* flags bits for query_tree_walker and query_tree_mutator */
|
|
#define QTW_IGNORE_RT_SUBQUERIES 0x01 /* subqueries in rtable */
|
|
#define QTW_IGNORE_CTE_SUBQUERIES 0x02 /* subqueries in cteList */
|
|
#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 */
|
|
|
|
|
|
extern Oid exprType(Node *expr);
|
|
extern int32 exprTypmod(Node *expr);
|
|
extern bool exprIsLengthCoercion(Node *expr, int32 *coercedTypmod);
|
|
extern bool expression_returns_set(Node *clause);
|
|
|
|
extern Oid exprCollation(Node *expr);
|
|
extern Oid exprInputCollation(Node *expr);
|
|
extern void exprSetCollation(Node *expr, Oid collation);
|
|
extern void exprSetInputCollation(Node *expr, Oid inputcollation);
|
|
|
|
extern int exprLocation(Node *expr);
|
|
|
|
extern bool expression_tree_walker(Node *node, bool (*walker) (),
|
|
void *context);
|
|
extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (),
|
|
void *context);
|
|
|
|
extern bool query_tree_walker(Query *query, bool (*walker) (),
|
|
void *context, int flags);
|
|
extern Query *query_tree_mutator(Query *query, Node *(*mutator) (),
|
|
void *context, int flags);
|
|
|
|
extern bool range_table_walker(List *rtable, bool (*walker) (),
|
|
void *context, int flags);
|
|
extern List *range_table_mutator(List *rtable, Node *(*mutator) (),
|
|
void *context, int flags);
|
|
|
|
extern bool query_or_expression_tree_walker(Node *node, bool (*walker) (),
|
|
void *context, int flags);
|
|
extern Node *query_or_expression_tree_mutator(Node *node, Node *(*mutator) (),
|
|
void *context, int flags);
|
|
|
|
extern bool raw_expression_tree_walker(Node *node, bool (*walker) (),
|
|
void *context);
|
|
|
|
#endif /* NODEFUNCS_H */
|