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Add xmlexists function

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by Mike Fowler, reviewed by Peter Eisentraut
This commit is contained in:
Peter Eisentraut
2010-08-05 04:21:54 +00:00
parent 26e47efb66
commit 641459f269
10 changed files with 312 additions and 31 deletions
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48
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.714 2010/07/25 23:21:21 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.715 2010/08/05 04:21:53 petere Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -425,6 +425,7 @@ static TypeName *TableFuncTypeName(List *columns);
%type <target> xml_attribute_el
%type <list> xml_attribute_list xml_attributes
%type <node> xml_root_version opt_xml_root_standalone
%type <node> xmlexists_argument
%type <ival> document_or_content
%type <boolean> xml_whitespace_option
@@ -511,13 +512,13 @@ static TypeName *TableFuncTypeName(List *columns);
OBJECT_P OF OFF OFFSET OIDS ON ONLY OPERATOR OPTION OPTIONS OR
ORDER OUT_P OUTER_P OVER OVERLAPS OVERLAY OWNED OWNER
PARSER PARTIAL PARTITION PASSWORD PLACING PLANS POSITION
PARSER PARTIAL PARTITION PASSING PASSWORD PLACING PLANS POSITION
PRECEDING PRECISION PRESERVE PREPARE PREPARED PRIMARY
PRIOR PRIVILEGES PROCEDURAL PROCEDURE
QUOTE
RANGE READ REAL REASSIGN RECHECK RECURSIVE REFERENCES REINDEX
RANGE READ REAL REASSIGN RECHECK RECURSIVE REF REFERENCES REINDEX
RELATIVE_P RELEASE RENAME REPEATABLE REPLACE REPLICA RESET RESTART
RESTRICT RETURNING RETURNS REVOKE RIGHT ROLE ROLLBACK ROW ROWS RULE
@@ -539,7 +540,7 @@ static TypeName *TableFuncTypeName(List *columns);
WHEN WHERE WHITESPACE_P WINDOW WITH WITHOUT WORK WRAPPER WRITE
XML_P XMLATTRIBUTES XMLCONCAT XMLELEMENT XMLFOREST XMLPARSE
XML_P XMLATTRIBUTES XMLCONCAT XMLELEMENT XMLEXISTS XMLFOREST XMLPARSE
XMLPI XMLROOT XMLSERIALIZE
YEAR_P YES_P
@@ -9839,6 +9840,21 @@ func_expr: func_name '(' ')' over_clause
{
$$ = makeXmlExpr(IS_XMLELEMENT, $4, $6, $8, @1);
}
| XMLEXISTS '(' c_expr xmlexists_argument ')'
{
/* xmlexists(A PASSING [BY REF] B [BY REF]) is
* converted to xmlexists(A, B)*/
FuncCall *n = makeNode(FuncCall);
n->funcname = SystemFuncName("xmlexists");
n->args = list_make2($3, $4);
n->agg_order = NIL;
n->agg_star = FALSE;
n->agg_distinct = FALSE;
n->func_variadic = FALSE;
n->over = NULL;
n->location = @1;
$$ = (Node *)n;
}
| XMLFOREST '(' xml_attribute_list ')'
{
$$ = makeXmlExpr(IS_XMLFOREST, NULL, $3, NIL, @1);
@@ -9929,6 +9945,27 @@ xml_whitespace_option: PRESERVE WHITESPACE_P { $$ = TRUE; }
| /*EMPTY*/ { $$ = FALSE; }
;
/* We allow several variants for SQL and other compatibility. */
xmlexists_argument:
PASSING c_expr
{
$$ = $2;
}
| PASSING c_expr BY REF
{
$$ = $2;
}
| PASSING BY REF c_expr
{
$$ = $4;
}
| PASSING BY REF c_expr BY REF
{
$$ = $4;
}
;
/*
* Window Definitions
*/
@@ -10999,6 +11036,7 @@ unreserved_keyword:
| PARSER
| PARTIAL
| PARTITION
| PASSING
| PASSWORD
| PLANS
| PRECEDING
@@ -11015,6 +11053,7 @@ unreserved_keyword:
| REASSIGN
| RECHECK
| RECURSIVE
| REF
| REINDEX
| RELATIVE_P
| RELEASE
@@ -11148,6 +11187,7 @@ col_name_keyword:
| XMLATTRIBUTES
| XMLCONCAT
| XMLELEMENT
| XMLEXISTS
| XMLFOREST
| XMLPARSE
| XMLPI