diff options
Diffstat (limited to 'src/include/nodes')
| -rw-r--r-- | src/include/nodes/execnodes.h | 25 |
1 files changed, 12 insertions, 13 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 182a6956bb0..7f71b7625df 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -795,15 +795,15 @@ typedef struct ExecAuxRowMark * * All-in-memory tuple hash tables are used for a number of purposes. * - * Note: tab_hash_funcs are for the key datatype(s) stored in the table, - * and tab_eq_func are non-cross-type equality operators for those types. - * Normally these are the only functions used, but FindTupleHashEntry() - * supports searching a hashtable using cross-data-type hashing. For that, - * the caller must supply hash functions for the LHS datatype as well as - * the cross-type equality operators to use. in_hash_funcs and cur_eq_func - * are set to point to the caller's function arrays while doing such a search. - * During LookupTupleHashEntry(), they point to tab_hash_funcs and - * tab_eq_func respectively. + * Note: tab_hash_expr is for hashing the key datatype(s) stored in the table, + * and tab_eq_func is a non-cross-type ExprState for equality checks on those + * types. Normally these are the only ExprStates used, but + * FindTupleHashEntry() supports searching a hashtable using cross-data-type + * hashing. For that, the caller must supply an ExprState to hash the LHS + * datatype as well as the cross-type equality ExprState to use. in_hash_expr + * and cur_eq_func are set to point to the caller's hash and equality + * ExprStates while doing such a search. During LookupTupleHashEntry(), they + * point to tab_hash_expr and tab_eq_func respectively. * ---------------------------------------------------------------- */ typedef struct TupleHashEntryData *TupleHashEntry; @@ -830,7 +830,7 @@ typedef struct TupleHashTableData tuplehash_hash *hashtab; /* underlying hash table */ int numCols; /* number of columns in lookup key */ AttrNumber *keyColIdx; /* attr numbers of key columns */ - FmgrInfo *tab_hash_funcs; /* hash functions for table datatype(s) */ + ExprState *tab_hash_expr; /* ExprState for hashing table datatype(s) */ ExprState *tab_eq_func; /* comparator for table datatype(s) */ Oid *tab_collations; /* collations for hash and comparison */ MemoryContext tablecxt; /* memory context containing table */ @@ -839,9 +839,8 @@ typedef struct TupleHashTableData TupleTableSlot *tableslot; /* slot for referencing table entries */ /* The following fields are set transiently for each table search: */ TupleTableSlot *inputslot; /* current input tuple's slot */ - FmgrInfo *in_hash_funcs; /* hash functions for input datatype(s) */ + ExprState *in_hash_expr; /* ExprState for hashing input datatype(s) */ ExprState *cur_eq_func; /* comparator for input vs. table */ - uint32 hash_iv; /* hash-function IV */ ExprContext *exprcontext; /* expression context */ } TupleHashTableData; @@ -994,7 +993,7 @@ typedef struct SubPlanState * datatype(s) */ Oid *tab_collations; /* collations for hash and comparison */ FmgrInfo *tab_hash_funcs; /* hash functions for table datatype(s) */ - FmgrInfo *lhs_hash_funcs; /* hash functions for lefthand datatype(s) */ + ExprState *lhs_hash_expr; /* hash expr for lefthand datatype(s) */ FmgrInfo *cur_eq_funcs; /* equality functions for LHS vs. table */ ExprState *cur_eq_comp; /* equality comparator for LHS vs. table */ } SubPlanState; |