DrillSqlAggOperatorWithoutInference.java example

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/**
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.planner.sql;

import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.type.SqlTypeName;
import org.apache.calcite.sql.validate.SqlValidator;
import org.apache.calcite.sql.validate.SqlValidatorScope;
import org.apache.drill.exec.expr.fn.DrillFuncHolder;

import java.util.ArrayList;

public class DrillSqlAggOperatorWithoutInference extends DrillSqlAggOperator {
  public DrillSqlAggOperatorWithoutInference(String name, int argCount) {
    super(name, new ArrayList<DrillFuncHolder>(), argCount, argCount, DynamicReturnType.INSTANCE);
  }

  @Override
  public RelDataType deriveType(SqlValidator validator, SqlValidatorScope scope, SqlCall call) {
    return getAny(validator.getTypeFactory());
  }

  private RelDataType getAny(RelDataTypeFactory factory){
    return factory.createSqlType(SqlTypeName.ANY);
  }
}