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Phase 2 of hashed-aggregation project. nodeAgg.c now knows how to do

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hashed aggregation, but there's not yet planner support for it.
This commit is contained in:
Tom Lane
2002-11-06 22:31:24 +00:00
parent fc9814d17e
commit 2103b7baa2
12 changed files with 696 additions and 266 deletions
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36
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 1.76 2002/11/06 00:00:44 tgl Exp $
* $Id: execnodes.h,v 1.77 2002/11/06 22:31:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -661,12 +661,18 @@ typedef struct MaterialState
*
* csstate.css_ScanTupleSlot refers to output of underlying plan.
*
* Note: the associated ExprContext contains ecxt_aggvalues and ecxt_aggnulls
* arrays, which hold the computed agg values for the current input group
* during evaluation of an Agg node's output tuple(s).
* Note: csstate.cstate.cs_ExprContext contains ecxt_aggvalues and
* ecxt_aggnulls arrays, which hold the computed agg values for the current
* input group during evaluation of an Agg node's output tuple(s). We
* create a second ExprContext, tmpcontext, in which to evaluate input
* expressions and run the aggregate transition functions.
* -------------------------
*/
typedef struct AggStatePerAggData *AggStatePerAgg; /* private in nodeAgg.c */
/* these structs are private in nodeAgg.c: */
typedef struct AggStatePerAggData *AggStatePerAgg;
typedef struct AggStatePerGroupData *AggStatePerGroup;
typedef struct AggHashEntryData *AggHashEntry;
typedef struct AggHashTableData *AggHashTable;
typedef struct AggState
{
@ -674,13 +680,18 @@ typedef struct AggState
List *aggs; /* all Aggref nodes in targetlist & quals */
int numaggs; /* length of list (could be zero!) */
FmgrInfo *eqfunctions; /* per-grouping-field equality fns */
HeapTuple grp_firstTuple; /* copy of first tuple of current group */
AggStatePerAgg peragg; /* per-Aggref working state */
MemoryContext tup_cxt; /* context for per-output-tuple
* expressions */
MemoryContext agg_cxt[2]; /* pair of expression eval memory contexts */
int which_cxt; /* 0 or 1, indicates current agg_cxt */
AggStatePerAgg peragg; /* per-Aggref information */
MemoryContext aggcontext; /* memory context for long-lived data */
ExprContext *tmpcontext; /* econtext for input expressions */
bool agg_done; /* indicates completion of Agg scan */
/* these fields are used in AGG_PLAIN and AGG_SORTED modes: */
AggStatePerGroup pergroup; /* per-Aggref-per-group working state */
HeapTuple grp_firstTuple; /* copy of first tuple of current group */
/* these fields are used in AGG_HASHED mode: */
AggHashTable hashtable; /* hash table with one entry per group */
bool table_filled; /* hash table filled yet? */
AggHashEntry next_hash_entry; /* next entry in current chain */
int next_hash_bucket; /* next chain */
} AggState;
/* ---------------------
@ -691,9 +702,8 @@ typedef struct GroupState
{
CommonScanState csstate; /* its first field is NodeTag */
FmgrInfo *eqfunctions; /* per-field lookup data for equality fns */
bool grp_useFirstTuple; /* first tuple not processed yet */
bool grp_done;
HeapTuple grp_firstTuple; /* copy of first tuple of current group */
bool grp_done; /* indicates completion of Group scan */
} GroupState;
/* ----------------