org.apache.flink.table.planner.functions.utils.HiveFunctionUtils Maven / Gradle / Ivy

/*
 * 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.flink.table.planner.functions.utils;

import org.apache.flink.table.planner.calcite.FlinkTypeFactory;
import org.apache.flink.table.types.DataType;
import org.apache.flink.table.types.logical.LogicalType;
import org.apache.flink.table.types.utils.TypeConversions;

import org.apache.calcite.rel.type.RelDataType;

import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import static org.apache.flink.table.runtime.types.LogicalTypeDataTypeConverter.fromDataTypeToLogicalType;

/** Hack utils for hive function. */
public class HiveFunctionUtils {

    public static boolean isHiveFunc(Object function) {
        try {
            getSetArgsMethod(function);
            return true;
        } catch (NoSuchMethodException e) {
            return false;
        }
    }

    private static Method getSetArgsMethod(Object function) throws NoSuchMethodException {
        return function.getClass()
                .getMethod("setArgumentTypesAndConstants", Object[].class, DataType[].class);
    }

    static Serializable invokeSetArgs(
            Serializable function, Object[] constantArguments, LogicalType[] argTypes) {
        try {
            // See hive HiveFunction
            Method method = getSetArgsMethod(function);
            method.invoke(
                    function, constantArguments, TypeConversions.fromLogicalToDataType(argTypes));
            return function;
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    static RelDataType invokeGetResultType(
            Object function,
            Object[] constantArguments,
            LogicalType[] argTypes,
            FlinkTypeFactory typeFactory) {
        try {
            // See hive HiveFunction
            Method method =
                    function.getClass()
                            .getMethod("getHiveResultType", Object[].class, DataType[].class);
            DataType resultType =
                    (DataType)
                            method.invoke(
                                    function,
                                    constantArguments,
                                    TypeConversions.fromLogicalToDataType(argTypes));
            return typeFactory.createFieldTypeFromLogicalType(
                    fromDataTypeToLogicalType(resultType));
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }
}