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Change the planner-to-executor API so that the planner tells the executor

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which comparison operators to use for plan nodes involving tuple comparison
(Agg, Group, Unique, SetOp).  Formerly the executor looked up the default
equality operator for the datatype, which was really pretty shaky, since it's
possible that the data being fed to the node is sorted according to some
nondefault operator class that could have an incompatible idea of equality.
The planner knows what it has sorted by and therefore can provide the right
equality operator to use.  Also, this change moves a couple of catalog lookups
out of the executor and into the planner, which should help startup time for
pre-planned queries by some small amount.  Modify the planner to remove some
other cavalier assumptions about always being able to use the default
operators.  Also add "nulls first/last" info to the Plan node for a mergejoin
--- neither the executor nor the planner can cope yet, but at least the API is
in place.
This commit is contained in:
Tom Lane
2007-01-10 18:06:05 +00:00
parent 5f6d735356
commit a191a169d6
25 changed files with 722 additions and 263 deletions
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9
src/include/utils/lsyscache.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/lsyscache.h,v 1.111 2007/01/09 02:14:16 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/lsyscache.h,v 1.112 2007/01/10 18:06:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -37,10 +37,15 @@ extern Oid get_opfamily_member(Oid opfamily, Oid lefttype, Oid righttype,
int16 strategy);
extern bool get_op_mergejoin_info(Oid eq_op, Oid *left_sortop,
Oid *right_sortop, Oid *opfamily);
extern bool get_op_compare_function(Oid opno, Oid *cmpfunc, bool *reverse);
extern bool get_compare_function_for_ordering_op(Oid opno,
Oid *cmpfunc, bool *reverse);
extern Oid get_equality_op_for_ordering_op(Oid opno);
extern Oid get_ordering_op_for_equality_op(Oid opno, bool use_lhs_type);
extern Oid get_compatible_hash_operator(Oid opno, bool use_lhs_type);
extern Oid get_op_hash_function(Oid opno);
extern void get_op_btree_interpretation(Oid opno,
List **opfamilies, List **opstrats);
extern bool ops_in_same_btree_opfamily(Oid opno1, Oid opno2);
extern Oid get_opfamily_proc(Oid opfamily, Oid lefttype, Oid righttype,
int16 procnum);
extern char *get_attname(Oid relid, AttrNumber attnum);