public RelDataType resolveColumn(String name, SqlNode ctx) {
final SqlValidatorNamespace selectNs = validator.getNamespace(select);
final RelDataType rowType = selectNs.getRowType();
final RelDataTypeField field = validator.catalogReader.field(rowType, name);
if (field != null) {
return field.getType();
}
final SqlValidatorScope selectScope = validator.getSelectScope(select);
return selectScope.resolveColumn(name, ctx);
}
