protected RelNode optimizeLoopbackLink(
RelOptCluster cluster, RelOptConnection connection, String[] actualName) throws SQLException {
if (directory == null) {
return null;
}
if (directory.server == null) {
return null;
}
if ((directory.server.schemaName != null)
&& !directory.server.useSchemaNameAsForeignQualifier) {
// Schema name should never be specified for a connection to
// Farrago; if it is, bail.
return null;
}
Connection loopbackConnection = directory.server.getConnection();
if (!(loopbackConnection instanceof FarragoJdbcEngineConnection)) {
Connection conn = loopbackConnection;
while ((conn != null) && (conn instanceof DelegatingConnection)) {
conn = ((DelegatingConnection) conn).getDelegate();
}
if (!(conn instanceof FarragoJdbcEngineConnection)) {
return null;
}
}
String catalogName = directory.server.catalogName;
if (catalogName == null) {
// No catalog name specified, so try to query the connection for
// it.
catalogName = loopbackConnection.getCatalog();
if (catalogName == null) {
return null;
}
}
if (actualName[0] == null) {
actualName[0] = catalogName;
}
// REVIEW jvs 14-Aug-2006: Security security security.
RelOptTable realTable = getPreparingStmt().getTableForMember(actualName);
if (realTable == null) {
return null;
}
return realTable.toRel(cluster, connection);
}
