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Initial SQL/XML support: xml data type and initial set of functions.

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This commit is contained in:
Peter Eisentraut
2006-12-21 16:05:16 +00:00
parent ed1e9cd501
commit 8c1de5fb00
39 changed files with 2446 additions and 128 deletions
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42
src/backend/parser/parse_coerce.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_coerce.c,v 2.147 2006/12/10 22:13:26 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_coerce.c,v 2.148 2006/12/21 16:05:14 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -919,6 +919,46 @@ coerce_to_bigint(ParseState *pstate, Node *node,
return node;
}
/*
* coerce_to_xml()
* Coerce an argument of a construct that requires xml input.
* Also check that input is not a set.
*
* Returns the possibly-transformed node tree.
*
* As with coerce_type, pstate may be NULL if no special unknown-Param
* processing is wanted.
*/
Node *
coerce_to_xml(ParseState *pstate, Node *node,
const char *constructName)
{
Oid inputTypeId = exprType(node);
if (inputTypeId != XMLOID)
{
node = coerce_to_target_type(pstate, node, inputTypeId,
XMLOID, -1,
COERCION_ASSIGNMENT,
COERCE_IMPLICIT_CAST);
if (node == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
/* translator: first %s is name of a SQL construct, eg LIMIT */
errmsg("argument of %s must be type xml, not type %s",
constructName, format_type_be(inputTypeId))));
}
if (expression_returns_set(node))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
/* translator: %s is name of a SQL construct, eg LIMIT */
errmsg("argument of %s must not return a set",
constructName)));
return node;
}
/* select_common_type()
* Determine the common supertype of a list of input expression types.