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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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10
src/include/parser/parse_node.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/parser/parse_node.h,v 1.58 2008/10/08 01:14:44 tgl Exp $
* $PostgreSQL: pgsql/src/include/parser/parse_node.h,v 1.59 2008/12/28 18:54:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -57,6 +57,12 @@
* p_future_ctes: list of CommonTableExprs (WITH items) that are not yet
* visible due to scope rules. This is used to help improve error messages.
*
* p_windowdefs: list of WindowDefs representing WINDOW and OVER clauses.
* We collect these while transforming expressions and then transform them
* afterwards (so that any resjunk tlist items needed for the sort/group
* clauses end up at the end of the query tlist). A WindowDef's location in
* this list, counting from 1, is the winref number to use to reference it.
*
* p_paramtypes: an array of p_numparams type OIDs for $n parameter symbols
* (zeroth entry in array corresponds to $1). If p_variableparams is true, the
* set of param types is not predetermined; in that case, a zero array entry
@@ -77,6 +83,7 @@ typedef struct ParseState
List *p_varnamespace; /* current namespace for columns */
List *p_ctenamespace; /* current namespace for common table exprs */
List *p_future_ctes; /* common table exprs not yet in namespace */
List *p_windowdefs; /* raw representations of window clauses */
Oid *p_paramtypes; /* OIDs of types for $n parameter symbols */
int p_numparams; /* allocated size of p_paramtypes[] */
int p_next_resno; /* next targetlist resno to assign */
@@ -84,6 +91,7 @@ typedef struct ParseState
Node *p_value_substitute; /* what to replace VALUE with, if any */
bool p_variableparams;
bool p_hasAggs;
bool p_hasWindowFuncs;
bool p_hasSubLinks;
bool p_is_insert;
bool p_is_update;