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Create a new file executor/execGrouping.c to centralize utility routines

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shared by nodeGroup, nodeAgg, and soon nodeSubplan.
This commit is contained in:
Tom Lane
2003-01-10 23:54:24 +00:00
parent c83702606c
commit 1afac12910
12 changed files with 498 additions and 337 deletions
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56
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 1.89 2003/01/10 21:08:15 tgl Exp $
* $Id: execnodes.h,v 1.90 2003/01/10 23:54:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -324,6 +324,46 @@ typedef struct EState
} EState;
/* ----------------------------------------------------------------
* Tuple Hash Tables
*
* All-in-memory tuple hash tables are used for a number of purposes.
* ----------------------------------------------------------------
*/
typedef struct TupleHashEntryData *TupleHashEntry;
typedef struct TupleHashTableData *TupleHashTable;
typedef struct TupleHashEntryData
{
TupleHashEntry next; /* next entry in same hash bucket */
uint32 hashkey; /* exact hash key of this entry */
HeapTuple firstTuple; /* copy of first tuple in this group */
/* there may be additional data beyond the end of this struct */
} TupleHashEntryData; /* VARIABLE LENGTH STRUCT */
typedef struct TupleHashTableData
{
int numCols; /* number of columns in lookup key */
AttrNumber *keyColIdx; /* attr numbers of key columns */
FmgrInfo *eqfunctions; /* lookup data for comparison functions */
MemoryContext tablecxt; /* memory context containing table */
MemoryContext tempcxt; /* context for function evaluations */
Size entrysize; /* actual size to make each hash entry */
int nbuckets; /* number of buckets in hash table */
TupleHashEntry buckets[1]; /* VARIABLE LENGTH ARRAY */
} TupleHashTableData; /* VARIABLE LENGTH STRUCT */
typedef struct
{
TupleHashEntry next_entry; /* next entry in current chain */
int next_bucket; /* next chain */
} TupleHashIterator;
#define ResetTupleHashIterator(iter) \
((iter)->next_entry = NULL, \
(iter)->next_bucket = 0)
/* ----------------------------------------------------------------
* Expression State Trees
*
@ -445,9 +485,6 @@ typedef struct BoolExprState
* SubPlanState node
* ----------------
*/
/* this struct is private in nodeSubplan.c: */
typedef struct SubPlanHashTableData *SubPlanHashTable;
typedef struct SubPlanState
{
ExprState xprstate;
@ -458,8 +495,8 @@ typedef struct SubPlanState
bool needShutdown; /* TRUE = need to shutdown subplan */
HeapTuple curTuple; /* copy of most recent tuple from subplan */
/* these are used when hashing the subselect's output: */
SubPlanHashTable hashtable; /* hash table for no-nulls subselect rows */
SubPlanHashTable hashnulls; /* hash table for rows with null(s) */
TupleHashTable hashtable; /* hash table for no-nulls subselect rows */
TupleHashTable hashnulls; /* hash table for rows with null(s) */
} SubPlanState;
/* ----------------
@ -877,8 +914,6 @@ typedef struct GroupState
/* 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
{
@ -894,10 +929,9 @@ typedef struct AggState
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 */
TupleHashTable 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 */
TupleHashIterator hashiter; /* for iterating through hash table */
} AggState;
/* ----------------