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Update UNION and subselect syntax.

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Support SQL92 syntax for type coersion of strings (type 'typeval').
 Example: "DATETIME 'now'". This works only for string constants and can
 not replace the CAST and ::type syntax which behave identically in this
 context.
This commit is contained in:
Thomas G. Lockhart 1997-11-17 16:37:24 +00:00
parent 6df962668a
commit 4b19101fc3
1 changed files with 27 additions and 12 deletions
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39
src/backend/parser/gram.y
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.67 1997/11/15 20:57:09 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.68 1997/11/17 16:37:24 thomas Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -153,7 +153,9 @@ static Node *makeIndexable(char *opname, Node *lexpr, Node *rexpr);
%type <list> union_clause, select_list
%type <list> join_list
%type <sortgroupby> join_using
%type <sortgroupby>
join_using
%type <boolean> opt_union
%type <node> position_expr
%type <list> extract_list, position_list
@ -1130,7 +1132,7 @@ FetchStmt: FETCH opt_direction fetch_how_many opt_portal_name
n->direction = $2;
n->howMany = $3;
n->portalname = $4;
n->ismove = true;
n->ismove = TRUE;
$$ = (Node *)n;
}
;
@ -2097,27 +2099,27 @@ RetrieveStmt: SELECT opt_unique res_target_list2
}
;
union_clause: UNION select_list { $$ = $2; }
union_clause: UNION opt_union select_list { $$ = $3; }
| /*EMPTY*/ { $$ = NIL; }
;
select_list: select_list UNION SubSelect
{ $$ = lappend($1, $3); }
select_list: select_list UNION opt_union SubSelect
{ $$ = lappend($1, $4); }
| SubSelect
{ $$ = lcons($1, NIL); }
;
SubSelect: SELECT opt_unique res_target_list2
result from_clause where_clause
from_clause where_clause
group_clause having_clause
{
SubSelect *n = makeNode(SubSelect);
n->unique = $2;
n->targetList = $3;
n->fromClause = $5;
n->whereClause = $6;
n->groupClause = $7;
n->havingClause = $8;
n->fromClause = $4;
n->whereClause = $5;
n->groupClause = $6;
n->havingClause = $7;
$$ = (Node *)n;
}
;
@ -2128,9 +2130,14 @@ result: INTO TABLE relation_name
{ $$ = NULL; }
;
opt_union: ALL { $$ = TRUE; }
| /*EMPTY*/ { $$ = FALSE; }
;
opt_unique: DISTINCT { $$ = "*"; }
| DISTINCT ON ColId { $$ = $3; }
| /*EMPTY*/ { $$ = NULL;}
| ALL { $$ = NULL; }
| /*EMPTY*/ { $$ = NULL; }
;
sort_clause: ORDER BY sortby_list { $$ = $3; }
@ -3416,6 +3423,14 @@ AexprConst: Iconst
n->val.val.str = $1;
$$ = (Node *)n;
}
| Typename Sconst
{
A_Const *n = makeNode(A_Const);
n->typename = $1;
n->val.type = T_String;
n->val.val.str = $2;
$$ = (Node *)n;
}
| ParamNo
{ $$ = (Node *)$1; }
| TRUE_P