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Revise tuplestore and nodeMaterial so that we don't have to read the

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entire contents of the subplan into the tuplestore before we can return
any tuples.  Instead, the tuplestore holds what we've already read, and
we fetch additional rows from the subplan as needed.  Random access to
the previously-read rows works with the tuplestore, and doesn't affect
the state of the partially-read subplan.  This is a step towards fixing
the problems with cursors over complex queries --- we don't want to
stick in Materialize nodes if they'll prevent quick startup for a cursor.
This commit is contained in:
Tom Lane
2003-03-09 02:19:13 +00:00
parent 05a966fca4
commit aa60eecc37
7 changed files with 280 additions and 240 deletions
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7
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: execnodes.h,v 1.95 2003/02/16 02:30:39 tgl Exp $
* $Id: execnodes.h,v 1.96 2003/03/09 02:19:13 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -917,14 +917,13 @@ typedef struct HashJoinState
* of a subplan into a temporary file.
*
* ss.ss_ScanTupleSlot refers to output of underlying plan.
*
* tuplestorestate private state of tuplestore.c
* ----------------
*/
typedef struct MaterialState
{
ScanState ss; /* its first field is NodeTag */
void *tuplestorestate;
void *tuplestorestate; /* private state of tuplestore.c */
bool eof_underlying; /* reached end of underlying plan? */
} MaterialState;
/* ----------------