/**
* 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.exec.expr.fn;
import java.util.List;
import java.util.Map;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.types.TypeProtos;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.common.util.DecimalScalePrecisionDivideFunction;
import org.apache.drill.common.util.DecimalScalePrecisionModFunction;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionScope;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling;
import org.apache.drill.exec.util.DecimalUtility;
public class DrillDecimalModScaleFuncHolder extends DrillSimpleFuncHolder{
public DrillDecimalModScaleFuncHolder(FunctionScope scope, NullHandling nullHandling, boolean isBinaryCommutative, boolean isRandom,
String[] registeredNames, ValueReference[] parameters, ValueReference returnValue, WorkspaceReference[] workspaceVars,
Map<String, String> methods, List<String> imports) {
super(scope, nullHandling, isBinaryCommutative, isRandom, registeredNames, parameters, returnValue, workspaceVars, methods, imports);
}
/*
* This function scope is used by divide functions for decimal data type.
* DecimalScalePrecisionDivideFunction is used to compute the output types'
* scale and precision
*/
@Override
public MajorType getReturnType(List<LogicalExpression> args) {
TypeProtos.DataMode mode = returnValue.type.getMode();
if (nullHandling == NullHandling.NULL_IF_NULL) {
// if any one of the input types is nullable, then return nullable return type
for (LogicalExpression e : args) {
if (e.getMajorType().getMode() == TypeProtos.DataMode.OPTIONAL) {
mode = TypeProtos.DataMode.OPTIONAL;
break;
}
}
}
/* Get the result's scale and precision. This is a function scope for Divide function, assert we have
* only two inputs
*/
assert args.size() == 2;
DecimalScalePrecisionModFunction outputScalePrec =
new DecimalScalePrecisionModFunction(args.get(0).getMajorType().getPrecision(), args.get(0).getMajorType().getScale(),
args.get(1).getMajorType().getPrecision(), args.get(1).getMajorType().getScale());
return (TypeProtos.MajorType.newBuilder().setMinorType(DecimalUtility.getDecimalDataType(outputScalePrec.getOutputPrecision()))
.setScale(outputScalePrec.getOutputScale()).setPrecision(outputScalePrec.getOutputPrecision()).setMode(mode).build());
}
@Override
public boolean checkPrecisionRange() {
return true;
}
}