diff options
Diffstat (limited to 'src/include/nodes/primnodes.h')
| -rw-r--r-- | src/include/nodes/primnodes.h | 48 |
1 files changed, 24 insertions, 24 deletions
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index 7c3e0c6c4b8..926513e0af2 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: primnodes.h,v 1.40 2000/02/20 21:32:16 tgl Exp $ + * $Id: primnodes.h,v 1.41 2000/04/12 17:16:40 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -29,7 +29,7 @@ * 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 + * ressortgroupref - nonzero if referenced by a sort/group clause * reskey - order of key in a sort (for those > 0) * reskeyop - sort operator's regproc Oid * resjunk - set to true to eliminate the attribute @@ -37,12 +37,12 @@ * * Notes: * ressortgroupref is the parse/plan-time representation of ORDER BY and - * GROUP BY items. Targetlist entries with ressortgroupref=0 are not + * 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 + * 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 + * 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. @@ -329,7 +329,7 @@ typedef struct Aggref * subselect - subselect as Query* or parsetree * * A SubLink represents a subselect appearing in an expression, and in some - * cases also the combining operator(s) just above it. The subLinkType + * cases also the combining operator(s) just above it. The subLinkType * indicates the form of the expression represented: * EXISTS_SUBLINK EXISTS(SELECT ...) * ALL_SUBLINK (lefthand) op ALL (SELECT ...) @@ -350,21 +350,21 @@ typedef struct Aggref * NOTE: lefthand and oper have varying meanings depending on where you look * in the parse/plan pipeline: * 1. gram.y delivers a list of the (untransformed) lefthand expressions in - * lefthand, and sets oper to a one-element list containing the string - * name of the operator. + * lefthand, and sets oper to a one-element list containing the string + * name of the operator. * 2. The parser's expression transformation transforms lefthand normally, - * and replaces oper with a list of Oper nodes, one per lefthand - * expression. These nodes represent the parser's resolution of exactly - * which operator to apply to each pair of lefthand and targetlist - * expressions. However, we have not constructed actual Expr trees for - * these operators yet. This is the representation seen in saved rules - * and in the rewriter. + * and replaces oper with a list of Oper nodes, one per lefthand + * expression. These nodes represent the parser's resolution of exactly + * which operator to apply to each pair of lefthand and targetlist + * expressions. However, we have not constructed actual Expr trees for + * these operators yet. This is the representation seen in saved rules + * and in the rewriter. * 3. Finally, the planner converts the oper list to a list of normal Expr - * nodes representing the application of the operator(s) to the lefthand - * expressions and values from the inner targetlist. The inner - * targetlist items are represented by placeholder Param or Const nodes. - * The lefthand field is set to NIL, since its expressions are now in - * the Expr list. This representation is passed to the executor. + * nodes representing the application of the operator(s) to the lefthand + * expressions and values from the inner targetlist. The inner + * targetlist items are represented by placeholder Param or Const nodes. + * The lefthand field is set to NIL, since its expressions are now in + * the Expr list. This representation is passed to the executor. * * Planner routines that might see either representation 2 or 3 can tell * the difference by checking whether lefthand is NIL or not. Also, @@ -372,7 +372,7 @@ typedef struct Aggref * found in SubLinks that are children of SubPlan nodes. * * In EXISTS and EXPR SubLinks, both lefthand and oper are unused and are - * always NIL. useor is not significant either for these sublink types. + * always NIL. useor is not significant either for these sublink types. * ---------------- */ typedef enum SubLinkType @@ -432,12 +432,12 @@ typedef struct Array * refelemlength - length of the array element type * refelembyval - is the element type pass-by-value? * refupperindexpr - expressions that evaluate to upper array indexes - * reflowerindexpr - expressions that evaluate to lower array indexes + * reflowerindexpr - expressions that evaluate to lower array indexes * refexpr - the expression that evaluates to an array value * refassgnexpr - expression for the source value, or NULL if fetch * * If reflowerindexpr = NIL, then we are fetching or storing a single array - * element at the subscripts given by refupperindexpr. Otherwise we are + * element at the subscripts given by refupperindexpr. Otherwise we are * fetching or storing an array slice, that is a rectangular subarray * with lower and upper bounds given by the index expressions. * reflowerindexpr must be the same length as refupperindexpr when it @@ -445,7 +445,7 @@ typedef struct Array * * Note: array types can be fixed-length (refattrlength > 0), but only * when the element type is itself fixed-length. Otherwise they are - * varlena structures and have refattrlength = -1. In any case, + * varlena structures and have refattrlength = -1. In any case, * an array type is never pass-by-value. * * Note: currently, refelemtype is NOT the element type, but the array type, |