/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.ql.optimizer.calcite.reloperators;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.sql.SqlCallBinding;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlSpecialOperator;
import org.apache.calcite.sql.type.ReturnTypes;
import org.apache.calcite.sql.type.SqlOperandTypeInference;
import org.apache.calcite.sql.type.SqlTypeName;
public class HiveBetween extends SqlSpecialOperator {
public static final SqlSpecialOperator INSTANCE =
new HiveBetween();
private HiveBetween() {
super(
"BETWEEN",
SqlKind.BETWEEN,
30,
true,
ReturnTypes.BOOLEAN_NULLABLE,
FIRST_BOOLEAN_THEN_FIRST_KNOWN,
null);
}
/**
* Operand type-inference strategy where an unknown operand type is derived
* from the first operand with a known type, but the first operand is a boolean.
*/
public static final SqlOperandTypeInference FIRST_BOOLEAN_THEN_FIRST_KNOWN =
new SqlOperandTypeInference() {
public void inferOperandTypes(
SqlCallBinding callBinding,
RelDataType returnType,
RelDataType[] operandTypes) {
final RelDataType unknownType =
callBinding.getValidator().getUnknownType();
RelDataType knownType = unknownType;
for (int i = 1; i < callBinding.getCall().getOperandList().size(); i++) {
SqlNode operand = callBinding.getCall().getOperandList().get(i);
knownType = callBinding.getValidator().deriveType(
callBinding.getScope(), operand);
if (!knownType.equals(unknownType)) {
break;
}
}
RelDataTypeFactory typeFactory = callBinding.getTypeFactory();
operandTypes[0] = typeFactory.createSqlType(SqlTypeName.BOOLEAN);
for (int i = 1; i < operandTypes.length; ++i) {
operandTypes[i] = knownType;
}
}
};
}