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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
 *
 * 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.calcite.adapter.spark;

import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.schema.Function;
import org.apache.calcite.sql.SqlFunctionCategory;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.sql.type.OperandTypes;
import org.apache.calcite.sql.type.SqlOperandTypeChecker;
import org.apache.calcite.sql.type.SqlOperandTypeInference;
import org.apache.calcite.sql.type.SqlReturnTypeInference;
import org.apache.calcite.sql.validate.SqlUserDefinedFunction;

import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * Custom UDF representing a Spark Dataset lambda function.
 */
public class SparkObjectToColumnFunction extends SqlUserDefinedFunction {

  private SparkObjectToColumnFunction(SqlIdentifier opName,
      SqlReturnTypeInference returnTypeInference,
      SqlOperandTypeInference operandTypeInference,
      SqlOperandTypeChecker operandTypeChecker,
      List paramTypes, Function function) {
    super(opName, returnTypeInference, operandTypeInference, operandTypeChecker,
        paramTypes, function, SqlFunctionCategory.USER_DEFINED_CONSTRUCTOR);
  }

  public SparkObjectToColumnFunction(String name, SqlReturnTypeInference returnTypeInference,
      List paramTypes, Function function) {
    this(new SqlIdentifier(ImmutableList.of(name), SqlParserPos.ZERO), returnTypeInference,
        null, OperandTypes.ANY, paramTypes, function);
  }
}

// End SparkObjectToColumnFunction.java