postgresql/src/include/executor/nodeHashjoin.h

/*-------------------------------------------------------------------------
 *
 * nodeHashjoin.h
 *	  prototypes for nodeHashjoin.c
 *
 *
 * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/include/executor/nodeHashjoin.h,v 1.40 2010/01/02 16:58:03 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef NODEHASHJOIN_H
#define NODEHASHJOIN_H

#include "nodes/execnodes.h"
#include "storage/buffile.h"

extern HashJoinState *ExecInitHashJoin(HashJoin *node, EState *estate, int eflags);
extern TupleTableSlot *ExecHashJoin(HashJoinState *node);
extern void ExecEndHashJoin(HashJoinState *node);
extern void ExecReScanHashJoin(HashJoinState *node, ExprContext *exprCtxt);

extern void ExecHashJoinSaveTuple(MinimalTuple tuple, uint32 hashvalue,
					  BufFile **fileptr);

#endif   /* NODEHASHJOIN_H */
Postgres95 1.01 Distribution - Virgin Sources 1996-07-09 08:22:35 +02:00			`/*-------------------------------------------------------------------------`
			`*`
Change my-function-name-- to my_function_name, and optimizer renames. 1999-02-14 00:22:53 +01:00			`* nodeHashjoin.h`
Revise hash join code so that we can increase the number of batches on-the-fly, and thereby avoid blowing out memory when the planner has underestimated the hash table size. Hash join will now obey the work_mem limit with some faithfulness. Per my recent proposal (hash aggregate part isn't done yet though). 2005-03-06 23:15:05 +01:00			`* prototypes for nodeHashjoin.c`
Postgres95 1.01 Distribution - Virgin Sources 1996-07-09 08:22:35 +02:00			`*`
			`*`
Update copyright for the year 2010. 2010-01-02 17:58:17 +01:00			`* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group`
Add: * Portions Copyright (c) 1996-2000, PostgreSQL, Inc to all files copyright Regents of Berkeley. Man, that's a lot of files. 2000-01-26 06:58:53 +01:00			`* Portions Copyright (c) 1994, Regents of the University of California`
Postgres95 1.01 Distribution - Virgin Sources 1996-07-09 08:22:35 +02:00			`*`
Update copyright for the year 2010. 2010-01-02 17:58:17 +01:00			`* $PostgreSQL: pgsql/src/include/executor/nodeHashjoin.h,v 1.40 2010/01/02 16:58:03 momjian Exp $`
Postgres95 1.01 Distribution - Virgin Sources 1996-07-09 08:22:35 +02:00			`*`
			`*-------------------------------------------------------------------------`
			`*/`
Massive commit to run PGINDENT on all .c and .h files. 1997-09-07 07:04:48 +02:00			`#ifndef NODEHASHJOIN_H`
			`#define NODEHASHJOIN_H`
Postgres95 1.01 Distribution - Virgin Sources 1996-07-09 08:22:35 +02:00
Phase 1 of read-only-plans project: cause executor state nodes to point to plan nodes, not vice-versa. All executor state nodes now inherit from struct PlanState. Copying of plan trees has been simplified by not storing a list of SubPlans in Plan nodes (eliminating duplicate links). The executor still needs such a list, but it can build it during ExecutorStart since it has to scan the plan tree anyway. No initdb forced since no stored-on-disk structures changed, but you will need a full recompile because of node-numbering changes. 2002-12-05 16:50:39 +01:00			`#include "nodes/execnodes.h"`
Revise hash join code so that we can increase the number of batches on-the-fly, and thereby avoid blowing out memory when the planner has underestimated the hash table size. Hash join will now obey the work_mem limit with some faithfulness. Per my recent proposal (hash aggregate part isn't done yet though). 2005-03-06 23:15:05 +01:00			`#include "storage/buffile.h"`
Postgres95 1.01 Distribution - Virgin Sources 1996-07-09 08:22:35 +02:00
Extend the ExecInitNode API so that plan nodes receive a set of flag bits indicating which optional capabilities can actually be exercised at runtime. This will allow Sort and Material nodes, and perhaps later other nodes, to avoid unnecessary overhead in common cases. This commit just adds the infrastructure and arranges to pass the correct flag values down to plan nodes; none of the actual optimizations are here yet. I'm committing this separately in case anyone wants to measure the added overhead. (It should be negligible.) Simon Riggs and Tom Lane 2006-02-28 05:10:28 +01:00			`extern HashJoinState ExecInitHashJoin(HashJoin node, EState *estate, int eflags);`
Phase 1 of read-only-plans project: cause executor state nodes to point to plan nodes, not vice-versa. All executor state nodes now inherit from struct PlanState. Copying of plan trees has been simplified by not storing a list of SubPlans in Plan nodes (eliminating duplicate links). The executor still needs such a list, but it can build it during ExecutorStart since it has to scan the plan tree anyway. No initdb forced since no stored-on-disk structures changed, but you will need a full recompile because of node-numbering changes. 2002-12-05 16:50:39 +01:00			`extern TupleTableSlot ExecHashJoin(HashJoinState node);`
			`extern void ExecEndHashJoin(HashJoinState *node);`
			`extern void ExecReScanHashJoin(HashJoinState node, ExprContext exprCtxt);`

Rework temp_tablespaces patch so that temp tablespaces are assigned separately for each temp file, rather than once per sort or hashjoin; this allows spreading the data of a large sort or join across multiple tablespaces. (I remain dubious that this will make any difference in practice, but certain people insisted.) Arrange to cache the results of parsing the GUC variable instead of recomputing from scratch on every demand, and push usage of the cache down to the bottommost fd.c level. 2007-06-07 21:19:57 +02:00			`extern void ExecHashJoinSaveTuple(MinimalTuple tuple, uint32 hashvalue,`
			`BufFile **fileptr);`
Another pgindent run. Fixes enum indenting, and improves #endif spacing. Also adds space for one-line comments. 2001-10-28 07:26:15 +01:00
New pgindent run with fixes suggested by Tom. Patch manually reviewed, initdb/regression tests pass. 2001-11-05 18:46:40 +01:00			`#endif /* NODEHASHJOIN_H */`