public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
assert opBinding.getOperandCount() == 1;
final RelDataType multisetType = opBinding.getOperandType(0);
RelDataType componentType = multisetType.getComponentType();
assert componentType != null : "expected a multiset type: " + multisetType;
final RelDataTypeFactory typeFactory = opBinding.getTypeFactory();
final RelDataType type =
typeFactory.builder().add(SqlUtil.deriveAliasFromOrdinal(0), componentType).build();
return typeFactory.createMultisetType(type, -1);
}
public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
assert opBinding.getOperandCount() == 1;
final RelDataType recordMultisetType = opBinding.getOperandType(0);
RelDataType multisetType = recordMultisetType.getComponentType();
assert multisetType != null : "expected a multiset type: " + recordMultisetType;
final List<RelDataTypeField> fields = multisetType.getFieldList();
assert fields.size() > 0;
final RelDataType firstColType = fields.get(0).getType();
return opBinding.getTypeFactory().createMultisetType(firstColType, -1);
}
public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
assert opBinding.getOperandCount() == 1;
final RelDataType recordType = opBinding.getOperandType(0);
boolean isStruct = recordType.isStruct();
int fieldCount = recordType.getFieldCount();
assert isStruct && (fieldCount == 1);
RelDataTypeField fieldType = recordType.getFieldList().get(0);
assert fieldType != null : "expected a record type with one field: " + recordType;
final RelDataType firstColType = fieldType.getType();
return opBinding.getTypeFactory().createTypeWithNullability(firstColType, true);
}