diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 96b7a16084..ce41c750af 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.185 2008/07/26 19:15:35 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.186 2008/08/07 03:04:03 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -1414,21 +1414,31 @@ typedef struct HashState /* ---------------- * SetOpState information * - * SetOp nodes are used "on top of" sort nodes to discard - * duplicate tuples returned from the sort phase. These are - * more complex than a simple Unique since we have to count - * how many duplicates to return. + * Even in "sorted" mode, SetOp nodes are more complex than a simple + * Unique, since we have to count how many duplicates to return. But + * we also support hashing, so this is really more like a cut-down + * form of Agg. * ---------------- */ +/* this struct is private in nodeSetOp.c: */ +typedef struct SetOpStatePerGroupData *SetOpStatePerGroup; + typedef struct SetOpState { PlanState ps; /* its first field is NodeTag */ - FmgrInfo *eqfunctions; /* per-field lookup data for equality fns */ - bool subplan_done; /* has subplan returned EOF? */ - long numLeft; /* number of left-input dups of cur group */ - long numRight; /* number of right-input dups of cur group */ + FmgrInfo *eqfunctions; /* per-grouping-field equality fns */ + FmgrInfo *hashfunctions; /* per-grouping-field hash fns */ + bool setop_done; /* indicates completion of output scan */ long numOutput; /* number of dups left to output */ MemoryContext tempContext; /* short-term context for comparisons */ + /* these fields are used in SETOP_SORTED mode: */ + SetOpStatePerGroup pergroup; /* per-group working state */ + HeapTuple grp_firstTuple; /* copy of first tuple of current group */ + /* these fields are used in SETOP_HASHED mode: */ + TupleHashTable hashtable; /* hash table with one entry per group */ + MemoryContext tableContext; /* memory context containing hash table */ + bool table_filled; /* hash table filled yet? */ + TupleHashIterator hashiter; /* for iterating through hash table */ } SetOpState; /* ---------------- |