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Code Issues Releases Wiki Activity

Gram.y cleanup.

This commit is contained in:
Bruce Momjian 1998-01-17 05:01:34 +00:00
parent b37bc65f44
commit 53622d66d2
1 changed files with 65 additions and 10 deletions
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75
src/backend/parser/gram.y
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.92 1998/01/17 04:53:16 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.93 1998/01/17 05:01:34 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -63,6 +63,7 @@ extern List *parsetree;
static char *xlateSqlType(char *);
static Node *makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr);
static Node *makeRowExpr(char *opr, List *largs, List *rargs);
void mapTargetColumns(List *source, List *target);
static List *makeConstantList( A_Const *node);
static char *FlattenStringList(List *list);
@ -2882,7 +2883,6 @@ row_expr: '(' row_descriptor ')' IN '(' SubSelect ')'
n->subselect = $7;
$$ = (Node *)n;
}
/* We accept all Operators? */
| '(' row_descriptor ')' Op '(' SubSelect ')'
{
SubLink *n = makeNode(SubLink);
@ -2892,17 +2892,10 @@ row_expr: '(' row_descriptor ')' IN '(' SubSelect ')'
n->subselect = $6;
$$ = (Node *)n;
}
/* Do we need this?
| '(' row_descriptor ')' Op '(' row_descriptor ')'
{
SubLink *n = makeNode(SubLink);
n->lefthand = $2;
n->subLinkType = OPER_SUBLINK;
n->oper = lcons($4, NIL);
n->subselect = $6;
$$ = (Node *)n;
$$ = makeRowExpr($4, $2, $6);
}
*/
;
row_descriptor: row_list ',' a_expr
@ -3841,6 +3834,68 @@ makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr)
return (Node *)a;
}
/* makeRowExpr()
* Generate separate operator nodes for a single row descriptor expression.
* Perhaps this should go deeper in the parser someday... - thomas 1997-12-22
*/
static Node *
makeRowExpr(char *opr, List *largs, List *rargs)
{
Node *expr = NULL;
Node *larg, *rarg;
if (length(largs) != length(rargs))
elog(ERROR,"Unequal number of entries in row expression");
if (lnext(largs) != NIL)
expr = makeRowExpr(opr,lnext(largs),lnext(rargs));
larg = lfirst(largs);
rarg = lfirst(rargs);
if ((strcmp(opr, "=") == 0)
|| (strcmp(opr, "<") == 0)
|| (strcmp(opr, "<=") == 0)
|| (strcmp(opr, ">") == 0)
|| (strcmp(opr, ">=") == 0))
{
if (expr == NULL)
expr = makeA_Expr(OP, opr, larg, rarg);
else
expr = makeA_Expr(AND, NULL, expr, makeA_Expr(OP, opr, larg, rarg));
}
else if (strcmp(opr, "<>") == 0)
{
if (expr == NULL)
expr = makeA_Expr(OP, opr, larg, rarg);
else
expr = makeA_Expr(OR, NULL, expr, makeA_Expr(OP, opr, larg, rarg));
}
else
{
elog(ERROR,"Operator '%s' not implemented for row expressions",opr);
}
#if FALSE
while ((largs != NIL) && (rargs != NIL))
{
larg = lfirst(largs);
rarg = lfirst(rargs);
if (expr == NULL)
expr = makeA_Expr(OP, opr, larg, rarg);
else
expr = makeA_Expr(AND, NULL, expr, makeA_Expr(OP, opr, larg, rarg));
largs = lnext(largs);
rargs = lnext(rargs);
}
pprint(expr);
#endif
return expr;
}
void
mapTargetColumns(List *src, List *dst)
{