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Code

Only allow NULL in the prpoer places.

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This commit is contained in:
Bruce Momjian 1997-02-13 15:40:03 +00:00
parent eacd0fd938
commit cf2403896d
1 changed files with 17 additions and 13 deletions
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30
src/backend/parser/gram.y
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.25 1997/01/16 14:56:05 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.26 1997/02/13 15:40:03 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -149,7 +149,8 @@ static Node *makeA_Expr(int oper, char *opname, Node *lexpr, Node *rexpr);
%type <coldef> columnDef
%type <defelt> def_elem
%type <node> def_arg, columnElem, where_clause,
a_expr, AexprConst, in_expr_nodes, not_in_expr_nodes,
a_expr, a_expr_or_null, AexprConst,
in_expr_nodes, not_in_expr_nodes,
having_clause
%type <value> NumConst
%type <attr> event_object, attr
@ -1751,6 +1752,15 @@ Typename: typname opt_array_bounds
*
*****************************************************************************/
a_expr_or_null: a_expr
{ $$ = $1;}
| Pnull
{
A_Const *n = makeNode(A_Const);
n->val.type = T_Null;
$$ = (Node *)n;
}
a_expr: attr opt_indirection
{
$1->indirection = $2;
@ -1800,7 +1810,7 @@ a_expr: attr opt_indirection
}
$$ = (Node *)$2;
}
| '(' a_expr ')'
| '(' a_expr_or_null ')'
{ $$ = $2; }
| a_expr Op a_expr
{ $$ = makeA_Expr(OP, $2, $1, $3); }
@ -1892,9 +1902,9 @@ opt_indirection: '[' a_expr ']' opt_indirection
{ $$ = NIL; }
;
expr_list: a_expr
expr_list: a_expr_or_null
{ $$ = lcons($1, NIL); }
| expr_list ',' a_expr
| expr_list ',' a_expr_or_null
{ $$ = lappend($1, $3); }
;
@ -1966,7 +1976,7 @@ res_target_list: res_target_list ',' res_target_el
}
;
res_target_el: Id opt_indirection '=' a_expr
res_target_el: Id opt_indirection '=' a_expr_or_null
{
$$ = makeNode(ResTarget);
$$->name = $1;
@ -2014,7 +2024,7 @@ res_target_el2: a_expr AS Id
$$->indirection = NULL;
$$->val = (Node *)$1;
}
| a_expr
| a_expr_or_null
{
$$ = makeNode(ResTarget);
$$->name = NULL;
@ -2108,12 +2118,6 @@ AexprConst: Iconst
}
| ParamNo
{ $$ = (Node *)$1; }
| Pnull
{
A_Const *n = makeNode(A_Const);
n->val.type = T_Null;
$$ = (Node *)n;
}
;
ParamNo: PARAM