/**
* 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.drill.common.expression;
import java.util.List;
import org.apache.drill.common.types.TypeProtos.DataMode;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.common.types.TypeProtos.MinorType;
import org.apache.drill.common.types.Types;
public interface OutputTypeDeterminer {
public static OutputTypeDeterminer FIXED_BIT = new FixedType(Types.required(MinorType.BIT));
public static OutputTypeDeterminer FIXED_INT = new FixedType(Types.required(MinorType.INT));
public static OutputTypeDeterminer FIXED_BIGINT = new FixedType(Types.required(MinorType.BIGINT));
public static OutputTypeDeterminer FIXED_FLOAT4 = new FixedType(Types.required(MinorType.FLOAT4));
public static OutputTypeDeterminer FIXED_FLOAT8 = new FixedType(Types.required(MinorType.FLOAT8));
public static OutputTypeDeterminer FIXED_VARCHAR = new FixedType(Types.required(MinorType.VARCHAR));
public static OutputTypeDeterminer FIXED_VARBINARY = new FixedType(Types.required(MinorType.VARBINARY));
public static OutputTypeDeterminer FIXED_VAR16CHAR = new FixedType(Types.required(MinorType.VAR16CHAR));
public MajorType getOutputType(List<LogicalExpression> expressions);
public static class FixedType implements OutputTypeDeterminer{
public MajorType outputType;
public FixedType(MajorType outputType) {
super();
this.outputType = outputType;
}
@Override
public MajorType getOutputType(List<LogicalExpression> expressions) {
return outputType;
}
}
public static class SameAsFirstInput implements OutputTypeDeterminer{
@Override
public MajorType getOutputType(List<LogicalExpression> expressions) {
return expressions.get(0).getMajorType();
}
}
public static class SameAsAnySoft implements OutputTypeDeterminer{
@Override
public MajorType getOutputType(List<LogicalExpression> expressions) {
for(LogicalExpression e : expressions){
if(e.getMajorType().getMode() == DataMode.OPTIONAL){
return e.getMajorType();
}
}
return expressions.get(0).getMajorType();
}
}
public static class NullIfNullType implements OutputTypeDeterminer{
public MinorType outputMinorType;
public NullIfNullType(MinorType outputType) {
super();
this.outputMinorType = outputType;
}
@Override
public MajorType getOutputType(List<LogicalExpression> expressions) {
for(LogicalExpression e : expressions){
if(e.getMajorType().getMode() == DataMode.OPTIONAL){
return Types.optional(outputMinorType);
}
}
return Types.required(outputMinorType);
}
}
}