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Add support for xmlval IS DOCUMENT expression.

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This commit is contained in:
Peter Eisentraut
2007-01-14 13:11:54 +00:00
parent 62c06186f5
commit 2f8f76bcd5
11 changed files with 156 additions and 11 deletions
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22
src/backend/parser/gram.y
View File

@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.573 2007/01/09 02:14:14 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.574 2007/01/14 13:11:53 petere Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -7147,6 +7147,16 @@ a_expr: c_expr { $$ = $1; }
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("UNIQUE predicate is not yet implemented")));
}
| a_expr IS DOCUMENT_P %prec IS
{
$$ = makeXmlExpr(IS_DOCUMENT, NULL, NIL, list_make1($1));
}
| a_expr IS NOT DOCUMENT_P %prec IS
{
$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL,
makeXmlExpr(IS_DOCUMENT, NULL, NIL, list_make1($1)),
@2);
}
;
/*
@ -7207,6 +7217,16 @@ b_expr: c_expr
{
$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "<>", $1, (Node *) $6, @2);
}
| b_expr IS DOCUMENT_P %prec IS
{
$$ = makeXmlExpr(IS_DOCUMENT, NULL, NIL, list_make1($1));
}
| b_expr IS NOT DOCUMENT_P %prec IS
{
$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL,
makeXmlExpr(IS_DOCUMENT, NULL, NIL, list_make1($1)),
@2);
}
;
/*

11
src/backend/parser/parse_expr.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.207 2007/01/12 22:09:49 petere Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.208 2007/01/14 13:11:53 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -1483,6 +1483,10 @@ transformXmlExpr(ParseState *pstate, XmlExpr *x)
else
newe = coerce_to_boolean(pstate, newe, "XMLROOT");
break;
case IS_DOCUMENT:
newe = coerce_to_specific_type(pstate, newe, XMLOID,
"IS DOCUMENT");
break;
}
newx->args = lappend(newx->args, newe);
i++;
@ -1782,7 +1786,10 @@ exprType(Node *expr)
type = ((MinMaxExpr *) expr)->minmaxtype;
break;
case T_XmlExpr:
type = XMLOID;
if (((XmlExpr *) expr)->op == IS_DOCUMENT)
type = BOOLOID;
else
type = XMLOID;
break;
case T_NullIfExpr:
type = exprType((Node *) linitial(((NullIfExpr *) expr)->args));

5
src/backend/parser/parse_target.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_target.c,v 1.152 2007/01/05 22:19:34 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_target.c,v 1.153 2007/01/14 13:11:54 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -1337,6 +1337,9 @@ FigureColnameInternal(Node *node, char **name)
case IS_XMLROOT:
*name = "xmlroot";
return 2;
case IS_DOCUMENT:
/* nothing */
break;
}
break;
default: