/**
* 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.exceptions.DrillRuntimeException;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.ValueExpressions;
import org.apache.drill.common.types.TypeProtos;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionScope;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling;
public class DrillDecimalCastFuncHolder extends DrillSimpleFuncHolder {
public DrillDecimalCastFuncHolder(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);
}
@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;
}
}
}
if (args.size() != 3) {
StringBuilder err = new StringBuilder();
for (int i = 0; i < args.size(); i++) {
err.append("arg" + i + ": " + args.get(i).getMajorType().getMinorType());
}
throw new DrillRuntimeException("Decimal cast function invoked with incorect arguments" + err);
}
int scale = (int) ((ValueExpressions.LongExpression)(args.get(args.size() - 1))).getLong();
int precision = (int) ((ValueExpressions.LongExpression)(args.get(args.size() - 2))).getLong();
return (TypeProtos.MajorType.newBuilder().setMinorType(returnValue.type.getMinorType()).setScale(scale).setPrecision(precision).setMode(mode).build());
}
}