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From: David Hartwig <daveh@insightdist.com>
Here is a patch to remove the requirement that ORDER/GROUP BY clause identifiers be included in the target list.
This commit is contained in:
Marc G. Fournier
parent
a45341979f
commit
9f3d63936b
@ -26,7 +26,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.45 1998/02/27 08:43:52 vadim Exp $
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* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.46 1998/05/21 03:53:50 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -521,14 +521,16 @@ InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate)
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* NOTE: in the future we might want to initialize the junk
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* filter for all queries.
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* ----------------
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* SELECT added by daveh@insightdist.com 5/20/98 to allow
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* ORDER/GROUP BY have an identifier missing from the target.
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*/
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if (operation == CMD_UPDATE || operation == CMD_DELETE ||
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operation == CMD_INSERT)
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operation == CMD_INSERT || operation == CMD_SELECT)
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{
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JunkFilter *j = (JunkFilter *) ExecInitJunkFilter(targetList);
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estate->es_junkFilter = j;
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tupType = j->jf_cleanTupType; /* Added by daveh@insightdist.com 5/20/98 */
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}
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else
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estate->es_junkFilter = NULL;
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/parse_clause.c,v 1.15 1998/03/31 04:43:53 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/parse_clause.c,v 1.16 1998/05/21 03:53:50 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -182,6 +182,37 @@ find_targetlist_entry(ParseState *pstate, SortGroupBy *sortgroupby, List *tlist)
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}
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}
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}
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/* BEGIN add missing target entry hack.
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*
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* Prior to this hack, this function returned NIL if no target_result.
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* Thus, ORDER/GROUP BY required the attributes be in the target list.
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* Now it constructs a new target entry which is appended to the end of
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* the target list. This target is set to be resjunk = TRUE so that
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* it will not be projected into the final tuple.
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* daveh@insightdist.com 5/20/98
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*/
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if ( ! target_result) {
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List *p_target = tlist;
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Ident *missingTargetId = (Ident *)makeNode(Ident);
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TargetEntry *tent = makeNode(TargetEntry);
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/* Fill in the constructed Ident node */
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missingTargetId->type = T_Ident;
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missingTargetId->name = palloc(strlen(sortgroupby->name) + 1);
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strcpy(missingTargetId->name, sortgroupby->name);
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transformTargetId(pstate, missingTargetId, tent, missingTargetId->name, TRUE);
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/* Add to the end of the target list */
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while (lnext(p_target) != NIL) {
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p_target = lnext(p_target);
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}
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lnext(p_target) = lcons(tent, NIL);
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target_result = tent;
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}
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/* END add missing target entry hack. */
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return target_result;
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}
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@ -203,10 +234,6 @@ transformGroupClause(ParseState *pstate, List *grouplist, List *targetlist)
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Resdom *resdom;
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restarget = find_targetlist_entry(pstate, lfirst(grouplist), targetlist);
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if (restarget == NULL)
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elog(ERROR, "The field being grouped by must appear in the target list");
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grpcl->entry = restarget;
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resdom = restarget->resdom;
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grpcl->grpOpoid = oprid(oper("<",
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@ -262,9 +289,6 @@ transformSortClause(ParseState *pstate,
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restarget = find_targetlist_entry(pstate, sortby, targetlist);
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if (restarget == NULL)
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elog(ERROR, "The field being ordered by must appear in the target list");
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sortcl->resdom = resdom = restarget->resdom;
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sortcl->opoid = oprid(oper(sortby->useOp,
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resdom->restype,
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.12 1998/05/09 23:29:54 thomas Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.13 1998/05/21 03:53:51 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -52,6 +52,51 @@ coerce_target_expr(ParseState *pstate,
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Oid type_id,
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Oid attrtype);
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/*
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* transformTargetId - transforms an Ident Node to a Target Entry
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* Created this a function to allow the ORDER/GROUP BY clause be able
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* to construct a TargetEntry from an Ident.
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*
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* resjunk = TRUE will hide the target entry in the final result tuple.
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* daveh@insightdist.com 5/20/98
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*/
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void
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transformTargetId(ParseState *pstate,
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Ident *ident,
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TargetEntry *tent,
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char *resname,
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int16 resjunk)
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{
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Node *expr;
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Oid type_id;
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int16 type_mod;
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/*
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* here we want to look for column names only, not
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* relation names (even though they can be stored in
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* Ident nodes, too)
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*/
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expr = transformIdent(pstate, (Node *) ident, EXPR_COLUMN_FIRST);
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type_id = exprType(expr);
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if (nodeTag(expr) == T_Var)
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type_mod = ((Var *) expr)->vartypmod;
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else
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type_mod = -1;
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tent->resdom = makeResdom((AttrNumber) pstate->p_last_resno++,
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(Oid) type_id,
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type_mod,
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resname,
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(Index) 0,
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(Oid) 0,
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resjunk);
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tent->expr = expr;
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return;
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}
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/*
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* transformTargetList -
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* turns a list of ResTarget's into a list of TargetEntry's
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@ -71,36 +116,13 @@ transformTargetList(ParseState *pstate, List *targetlist)
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{
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case T_Ident:
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{
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Node *expr;
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Oid type_id;
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int16 type_mod;
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char *identname;
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char *resname;
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identname = ((Ident *) res->val)->name;
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handleTargetColname(pstate, &res->name, NULL, identname);
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/*
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* here we want to look for column names only, not
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* relation names (even though they can be stored in
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* Ident nodes, too)
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*/
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expr = transformIdent(pstate, (Node *) res->val, EXPR_COLUMN_FIRST);
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type_id = exprType(expr);
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if (nodeTag(expr) == T_Var)
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type_mod = ((Var *) expr)->vartypmod;
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else
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type_mod = -1;
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resname = (res->name) ? res->name : identname;
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tent->resdom = makeResdom((AttrNumber) pstate->p_last_resno++,
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(Oid) type_id,
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type_mod,
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resname,
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(Index) 0,
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(Oid) 0,
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0);
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tent->expr = expr;
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transformTargetId(pstate, (Ident*)res->val, tent, resname, FALSE);
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break;
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}
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case T_ParamNo:
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: parse_target.h,v 1.4 1998/02/26 04:42:49 momjian Exp $
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* $Id: parse_target.h,v 1.5 1998/05/21 03:53:51 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -24,5 +24,7 @@
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extern List *transformTargetList(ParseState *pstate, List *targetlist);
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extern List *makeTargetNames(ParseState *pstate, List *cols);
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extern void transformTargetId(ParseState *pstate, Ident *ident,
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TargetEntry *tent, char *resname, int16 resjunk);
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#endif /* PARSE_TARGET_H */
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