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Support window functions a la SQL:2008.

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Hitoshi Harada, with some kibitzing from Heikki and Tom.
This commit is contained in:
Tom Lane
2008-12-28 18:54:01 +00:00
parent 38e9348282
commit 95b07bc7f5
92 changed files with 6720 additions and 321 deletions
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13
src/include/optimizer/clauses.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.95 2008/10/09 19:27:40 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.96 2008/12/28 18:54:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -27,6 +27,13 @@ typedef struct
Size transitionSpace; /* for pass-by-ref transition data */
} AggClauseCounts;
typedef struct
{
int numWindowFuncs; /* total number of WindowFuncs found */
Index maxWinRef; /* windowFuncs[] is indexed 0 .. maxWinRef */
List **windowFuncs; /* lists of WindowFuncs for each winref */
} WindowFuncLists;
extern Expr *make_opclause(Oid opno, Oid opresulttype, bool opretset,
Expr *leftop, Expr *rightop);
@@ -47,8 +54,12 @@ extern Expr *make_ands_explicit(List *andclauses);
extern List *make_ands_implicit(Expr *clause);
extern bool contain_agg_clause(Node *clause);
extern List *pull_agg_clause(Node *clause);
extern void count_agg_clauses(Node *clause, AggClauseCounts *counts);
extern bool contain_window_function(Node *clause);
extern WindowFuncLists *find_window_functions(Node *clause, Index maxWinRef);
extern double expression_returns_set_rows(Node *clause);
extern bool contain_subplans(Node *clause);

6
src/include/optimizer/cost.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.93 2008/10/04 21:56:55 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.94 2008/12/28 18:54:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -85,6 +85,10 @@ extern void cost_agg(Path *path, PlannerInfo *root,
int numGroupCols, double numGroups,
Cost input_startup_cost, Cost input_total_cost,
double input_tuples);
extern void cost_windowagg(Path *path, PlannerInfo *root,
int numWindowFuncs, int numPartCols, int numOrderCols,
Cost input_startup_cost, Cost input_total_cost,
double input_tuples);
extern void cost_group(Path *path, PlannerInfo *root,
int numGroupCols, double numGroups,
Cost input_startup_cost, Cost input_total_cost,

7
src/include/optimizer/planmain.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.114 2008/10/07 19:27:04 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.115 2008/12/28 18:54:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -56,6 +56,11 @@ extern Agg *make_agg(PlannerInfo *root, List *tlist, List *qual,
int numGroupCols, AttrNumber *grpColIdx, Oid *grpOperators,
long numGroups, int numAggs,
Plan *lefttree);
extern WindowAgg *make_windowagg(PlannerInfo *root, List *tlist,
int numWindowFuncs,
int partNumCols, AttrNumber *partColIdx, Oid *partOperators,
int ordNumCols, AttrNumber *ordColIdx, Oid *ordOperators,
Plan *lefttree);
extern Group *make_group(PlannerInfo *root, List *tlist, List *qual,
int numGroupCols, AttrNumber *grpColIdx, Oid *grpOperators,
double numGroups,

4
src/include/optimizer/tlist.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/tlist.h,v 1.52 2008/08/07 19:35:02 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/tlist.h,v 1.53 2008/12/28 18:54:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -21,7 +21,7 @@ extern TargetEntry *tlist_member(Node *node, List *targetlist);
extern TargetEntry *tlist_member_ignore_relabel(Node *node, List *targetlist);
extern List *flatten_tlist(List *tlist);
extern List *add_to_flat_tlist(List *tlist, List *vars);
extern List *add_to_flat_tlist(List *tlist, List *exprs);
extern List *get_tlist_exprs(List *tlist, bool includeJunk);
extern bool tlist_same_datatypes(List *tlist, List *colTypes, bool junkOK);