diff options
Diffstat (limited to 'src/include/nodes/primnodes.h')
| -rw-r--r-- | src/include/nodes/primnodes.h | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index 2c4d0ffaa72..4eea81446b2 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -6,7 +6,7 @@ * * Copyright (c) 1994, Regents of the University of California * - * $Id: primnodes.h,v 1.33 1999/08/16 02:17:39 tgl Exp $ + * $Id: primnodes.h,v 1.34 1999/08/21 03:49:09 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -25,15 +25,33 @@ /* ---------------- * Resdom (Result Domain) * resno - attribute number - * restype - type of the resdom - * restypmod - type-specific modifier of the result + * restype - type of the value + * restypmod - type-specific modifier of the value * resname - name of the resdom (could be NULL) + * ressortgroupref - nonzero if referenced by a sort/group clause * reskey - order of key in a sort (for those > 0) - * reskeyop - sort operator Oid - * resgroupref - set to nonzero if referenced from a group by clause + * reskeyop - sort operator's regproc Oid * resjunk - set to true to eliminate the attribute * from final target list * + * Notes: + * ressortgroupref is the parse/plan-time representation of ORDER BY and + * GROUP BY items. Targetlist entries with ressortgroupref=0 are not + * sort/group items. If ressortgroupref>0, then this item is an ORDER BY or + * GROUP BY value. No two entries in a targetlist may have the same nonzero + * ressortgroupref --- but there is no particular meaning to the nonzero + * values, except as tags. (For example, one must not assume that lower + * ressortgroupref means a more significant sort key.) The order of the + * associated SortClause or GroupClause lists determine the semantics. + * + * reskey and reskeyop are the execution-time representation of sorting. + * reskey must be zero in any non-sort-key item. The reskey of sort key + * targetlist items for a sort plan node is 1,2,...,n for the n sort keys. + * The reskeyop of each such targetlist item is the sort operator's + * regproc OID. reskeyop will be zero in non-sort-key items. + * + * Both reskey and reskeyop are typically zero during parse/plan stages. + * The executor does not pay any attention to ressortgroupref. * ---------------- */ typedef struct Resdom @@ -43,9 +61,9 @@ typedef struct Resdom Oid restype; int32 restypmod; char *resname; + Index ressortgroupref; Index reskey; Oid reskeyop; - Index resgroupref; bool resjunk; } Resdom; @@ -275,7 +293,8 @@ typedef struct Iter * basetype - base type Oid of the aggregate * aggtype - type Oid of final result of the aggregate * target - attribute or expression we are aggregating on - * aggno - index to ecxt_values + * usenulls - TRUE to accept null values as inputs + * aggno - workspace for nodeAgg.c executor * ---------------- */ typedef struct Aggref @@ -285,8 +304,8 @@ typedef struct Aggref Oid basetype; Oid aggtype; Node *target; - int aggno; bool usenulls; + int aggno; } Aggref; /* ---------------- |