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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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15
src/backend/utils/sort/tuplestore.c
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@@ -47,7 +47,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/sort/tuplestore.c,v 1.44 2008/12/27 17:39:00 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/sort/tuplestore.c,v 1.45 2008/12/28 18:53:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1148,6 +1148,19 @@ tuplestore_trim(Tuplestorestate *state)
state->truncated = true;
}
/*
* tuplestore_in_memory
*
* Returns true if the tuplestore has not spilled to disk.
*
* XXX exposing this is a violation of modularity ... should get rid of it.
*/
bool
tuplestore_in_memory(Tuplestorestate *state)
{
return (state->status == TSS_INMEM);
}
/*
* Tape interface routines