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Support CREATE SCHEMA IF NOT EXISTS.

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Per discussion, schema-element subcommands are not allowed together with
this option, since it's not very obvious what should happen to the element
objects.

Fabrízio de Royes Mello
This commit is contained in:
Tom Lane
2012-10-03 19:47:11 -04:00
parent 994c36e01d
commit fb34e94d21
9 changed files with 105 additions and 0 deletions
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35
src/backend/parser/gram.y
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@ -1169,6 +1169,7 @@ CreateSchemaStmt:
n->schemaname = $5;
n->authid = $5;
n->schemaElts = $6;
n->if_not_exists = false;
$$ = (Node *)n;
}
| CREATE SCHEMA ColId OptSchemaEltList
@ -1178,6 +1179,40 @@ CreateSchemaStmt:
n->schemaname = $3;
n->authid = NULL;
n->schemaElts = $4;
n->if_not_exists = false;
$$ = (Node *)n;
}
| CREATE SCHEMA IF_P NOT EXISTS OptSchemaName AUTHORIZATION RoleId OptSchemaEltList
{
CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
/* One can omit the schema name or the authorization id. */
if ($6 != NULL)
n->schemaname = $6;
else
n->schemaname = $8;
n->authid = $8;
if ($9 != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("CREATE SCHEMA IF NOT EXISTS cannot include schema elements"),
parser_errposition(@9)));
n->schemaElts = $9;
n->if_not_exists = true;
$$ = (Node *)n;
}
| CREATE SCHEMA IF_P NOT EXISTS ColId OptSchemaEltList
{
CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
/* ...but not both */
n->schemaname = $6;
n->authid = NULL;
if ($7 != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("CREATE SCHEMA IF NOT EXISTS cannot include schema elements"),
parser_errposition(@7)));
n->schemaElts = $7;
n->if_not_exists = true;
$$ = (Node *)n;
}
;