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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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55
src/backend/parser/analyze.c
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@ -17,7 +17,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.384 2008/12/13 02:00:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.385 2008/12/28 18:53:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -306,6 +306,9 @@ transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt)
qry->hasAggs = pstate->p_hasAggs;
if (pstate->p_hasAggs)
parseCheckAggregates(pstate, qry);
qry->hasWindowFuncs = pstate->p_hasWindowFuncs;
if (pstate->p_hasWindowFuncs)
parseCheckWindowFuncs(pstate, qry);
return qry;
}
@ -673,6 +676,12 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt)
errmsg("cannot use aggregate function in VALUES"),
parser_errposition(pstate,
locate_agg_of_level((Node *) qry, 0))));
if (pstate->p_hasWindowFuncs)
ereport(ERROR,
(errcode(ERRCODE_WINDOWING_ERROR),
errmsg("cannot use window function in VALUES"),
parser_errposition(pstate,
locate_windowfunc((Node *) qry))));
return qry;
}
@ -764,6 +773,9 @@ transformSelectStmt(ParseState *pstate, SelectStmt *stmt)
/* make FOR UPDATE/FOR SHARE info available to addRangeTableEntry */
pstate->p_locking_clause = stmt->lockingClause;
/* make WINDOW info available for window functions, too */
pstate->p_windowdefs = stmt->windowClause;
/* process the WITH clause */
if (stmt->withClause)
{
@ -803,7 +815,8 @@ transformSelectStmt(ParseState *pstate, SelectStmt *stmt)
qry->groupClause = transformGroupClause(pstate,
stmt->groupClause,
&qry->targetList,
qry->sortClause);
qry->sortClause,
false);
if (stmt->distinctClause == NIL)
{
@ -834,6 +847,11 @@ transformSelectStmt(ParseState *pstate, SelectStmt *stmt)
qry->limitCount = transformLimitClause(pstate, stmt->limitCount,
"LIMIT");
/* transform window clauses after we have seen all window functions */
qry->windowClause = transformWindowDefinitions(pstate,
pstate->p_windowdefs,
&qry->targetList);
/* handle any SELECT INTO/CREATE TABLE AS spec */
if (stmt->intoClause)
{
@ -849,6 +867,9 @@ transformSelectStmt(ParseState *pstate, SelectStmt *stmt)
qry->hasAggs = pstate->p_hasAggs;
if (pstate->p_hasAggs || qry->groupClause || qry->havingQual)
parseCheckAggregates(pstate, qry);
qry->hasWindowFuncs = pstate->p_hasWindowFuncs;
if (pstate->p_hasWindowFuncs)
parseCheckWindowFuncs(pstate, qry);
foreach(l, stmt->lockingClause)
{
@ -889,6 +910,7 @@ transformValuesClause(ParseState *pstate, SelectStmt *stmt)
Assert(stmt->whereClause == NULL);
Assert(stmt->groupClause == NIL);
Assert(stmt->havingClause == NULL);
Assert(stmt->windowClause == NIL);
Assert(stmt->op == SETOP_NONE);
/* process the WITH clause */
@ -1061,6 +1083,12 @@ transformValuesClause(ParseState *pstate, SelectStmt *stmt)
errmsg("cannot use aggregate function in VALUES"),
parser_errposition(pstate,
locate_agg_of_level((Node *) newExprsLists, 0))));
if (pstate->p_hasWindowFuncs)
ereport(ERROR,
(errcode(ERRCODE_WINDOWING_ERROR),
errmsg("cannot use window function in VALUES"),
parser_errposition(pstate,
locate_windowfunc((Node *) newExprsLists))));
return qry;
}
@ -1289,6 +1317,9 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
qry->hasAggs = pstate->p_hasAggs;
if (pstate->p_hasAggs || qry->groupClause || qry->havingQual)
parseCheckAggregates(pstate, qry);
qry->hasWindowFuncs = pstate->p_hasWindowFuncs;
if (pstate->p_hasWindowFuncs)
parseCheckWindowFuncs(pstate, qry);
foreach(l, lockingClause)
{
@ -1623,6 +1654,12 @@ transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt)
errmsg("cannot use aggregate function in UPDATE"),
parser_errposition(pstate,
locate_agg_of_level((Node *) qry, 0))));
if (pstate->p_hasWindowFuncs)
ereport(ERROR,
(errcode(ERRCODE_WINDOWING_ERROR),
errmsg("cannot use window function in UPDATE"),
parser_errposition(pstate,
locate_windowfunc((Node *) qry))));
/*
* Now we are done with SELECT-like processing, and can get on with
@ -1692,6 +1729,7 @@ transformReturningList(ParseState *pstate, List *returningList)
List *rlist;
int save_next_resno;
bool save_hasAggs;
bool save_hasWindowFuncs;
int length_rtable;
if (returningList == NIL)
@ -1708,6 +1746,8 @@ transformReturningList(ParseState *pstate, List *returningList)
/* save other state so that we can detect disallowed stuff */
save_hasAggs = pstate->p_hasAggs;
pstate->p_hasAggs = false;
save_hasWindowFuncs = pstate->p_hasWindowFuncs;
pstate->p_hasWindowFuncs = false;
length_rtable = list_length(pstate->p_rtable);
/* transform RETURNING identically to a SELECT targetlist */
@ -1722,6 +1762,12 @@ transformReturningList(ParseState *pstate, List *returningList)
errmsg("cannot use aggregate function in RETURNING"),
parser_errposition(pstate,
locate_agg_of_level((Node *) rlist, 0))));
if (pstate->p_hasWindowFuncs)
ereport(ERROR,
(errcode(ERRCODE_WINDOWING_ERROR),
errmsg("cannot use window function in RETURNING"),
parser_errposition(pstate,
locate_windowfunc((Node *) rlist))));
/* no new relation references please */
if (list_length(pstate->p_rtable) != length_rtable)
@ -1748,6 +1794,7 @@ transformReturningList(ParseState *pstate, List *returningList)
/* restore state */
pstate->p_next_resno = save_next_resno;
pstate->p_hasAggs = save_hasAggs;
pstate->p_hasWindowFuncs = save_hasWindowFuncs;
return rlist;
}
@ -1883,6 +1930,10 @@ CheckSelectLocking(Query *qry)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE/SHARE is not allowed with aggregate functions")));
if (qry->hasWindowFuncs)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SELECT FOR UPDATE/SHARE is not allowed with window functions")));
}
/*