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Allow a_expr not just AexprConst in the right-hand list of

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IN and NOT IN operators.  Rewrite grotty implementation of IN-list
parsing ... look Ma, no global variable ...
This commit is contained in:
Tom Lane 1999-07-28 17:39:38 +00:00
parent bb68f6eaa6
commit 9682e8081b
1 changed files with 51 additions and 48 deletions
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99
src/backend/parser/gram.y
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.95 1999/07/27 03:51:06 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.96 1999/07/28 17:39:38 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -55,7 +55,6 @@
static char saved_relname[NAMEDATALEN]; /* need this for complex attributes */
static bool QueryIsRule = FALSE;
static List *saved_In_Expr = NIL;
static Oid *param_type_info;
static int pfunc_num_args;
extern List *parsetree;
@ -213,9 +212,8 @@ Oid param_type(int t); /* used in parse_expr.c */
%type <defelt> def_elem
%type <node> def_arg, columnElem, where_clause,
a_expr, a_expr_or_null, b_expr, AexprConst,
in_expr, in_expr_nodes, not_in_expr, not_in_expr_nodes,
having_clause
%type <list> row_descriptor, row_list, c_list, c_expr
in_expr, having_clause
%type <list> row_descriptor, row_list, c_list, c_expr, in_expr_nodes
%type <node> row_expr
%type <str> row_op
%type <node> case_expr, case_arg, when_clause, case_default
@ -3986,33 +3984,59 @@ a_expr: attr
makeA_Expr(OP, "<", $1, $4),
makeA_Expr(OP, ">", $1, $6));
}
| a_expr IN { saved_In_Expr = lcons($1,saved_In_Expr); } '(' in_expr ')'
| a_expr IN '(' in_expr ')'
{
saved_In_Expr = lnext(saved_In_Expr);
if (nodeTag($5) == T_SubLink)
/* in_expr returns a SubLink or a list of a_exprs */
if (IsA($4, SubLink))
{
SubLink *n = (SubLink *)$5;
SubLink *n = (SubLink *)$4;
n->lefthand = lcons($1, NIL);
n->oper = lcons("=",NIL);
n->useor = false;
n->subLinkType = ANY_SUBLINK;
$$ = (Node *)n;
}
else $$ = $5;
}
| a_expr NOT IN { saved_In_Expr = lcons($1,saved_In_Expr); } '(' not_in_expr ')'
{
saved_In_Expr = lnext(saved_In_Expr);
if (nodeTag($6) == T_SubLink)
else
{
SubLink *n = (SubLink *)$6;
n->lefthand = lcons($1, NIL);
n->oper = lcons("<>",NIL);
n->useor = false;
n->subLinkType = ALL_SUBLINK;
$$ = (Node *)n;
Node *n = NULL;
List *l;
foreach(l, (List *) $4)
{
Node *cmp = makeA_Expr(OP, "=", $1, lfirst(l));
if (n == NULL)
n = cmp;
else
n = makeA_Expr(OR, NULL, n, cmp);
}
$$ = n;
}
}
| a_expr NOT IN '(' in_expr ')'
{
/* in_expr returns a SubLink or a list of a_exprs */
if (IsA($5, SubLink))
{
SubLink *n = (SubLink *)$5;
n->lefthand = lcons($1, NIL);
n->oper = lcons("<>",NIL);
n->useor = false;
n->subLinkType = ALL_SUBLINK;
$$ = (Node *)n;
}
else
{
Node *n = NULL;
List *l;
foreach(l, (List *) $5)
{
Node *cmp = makeA_Expr(OP, "<>", $1, lfirst(l));
if (n == NULL)
n = cmp;
else
n = makeA_Expr(AND, NULL, n, cmp);
}
$$ = n;
}
else $$ = $6;
}
| a_expr Op '(' SubSelect ')'
{
@ -4632,33 +4656,13 @@ in_expr: SubSelect
$$ = (Node *)n;
}
| in_expr_nodes
{ $$ = $1; }
{ $$ = (Node *)$1; }
;
in_expr_nodes: AexprConst
{ $$ = makeA_Expr(OP, "=", lfirst(saved_In_Expr), $1); }
| in_expr_nodes ',' AexprConst
{ $$ = makeA_Expr(OR, NULL, $1,
makeA_Expr(OP, "=", lfirst(saved_In_Expr), $3));
}
;
not_in_expr: SubSelect
{
SubLink *n = makeNode(SubLink);
n->subselect = $1;
$$ = (Node *)n;
}
| not_in_expr_nodes
{ $$ = $1; }
;
not_in_expr_nodes: AexprConst
{ $$ = makeA_Expr(OP, "<>", lfirst(saved_In_Expr), $1); }
| not_in_expr_nodes ',' AexprConst
{ $$ = makeA_Expr(AND, NULL, $1,
makeA_Expr(OP, "<>", lfirst(saved_In_Expr), $3));
}
in_expr_nodes: a_expr
{ $$ = lcons($1, NIL); }
| in_expr_nodes ',' a_expr
{ $$ = lappend($1, $3); }
;
/* Case clause
@ -5239,7 +5243,6 @@ void parser_init(Oid *typev, int nargs)
{
QueryIsRule = FALSE;
saved_relname[0]= '\0';
saved_In_Expr = NULL;
param_type_init(typev, nargs);
}