bowenli86 commented on a change in pull request #8700: [FLINK-12657][hive] Integrate Flink with Hive UDF URL: https://github.com/apache/flink/pull/8700#discussion_r293210678
########## File path: flink-connectors/flink-connector-hive/src/main/java/org/apache/flink/table/functions/hive/conversion/HiveInspectors.java ########## @@ -0,0 +1,248 @@ +/* + * 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.functions.hive.conversion; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.table.catalog.hive.util.HiveTypeUtil; +import org.apache.flink.table.functions.hive.FlinkHiveUDFException; +import org.apache.flink.table.types.DataType; + +import org.apache.hadoop.hive.serde2.io.ByteWritable; +import org.apache.hadoop.hive.serde2.io.DoubleWritable; +import org.apache.hadoop.hive.serde2.io.ShortWritable; +import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.BooleanObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.ByteObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.DoubleObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.FloatObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.IntObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaBooleanObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaByteObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaDoubleObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaFloatObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaIntObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaLongObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaShortObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaStringObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.LongObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.ShortObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.StringObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.primitive.VoidObjectInspector; +import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo; +import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo; +import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory; +import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils; +import org.apache.hadoop.io.BooleanWritable; +import org.apache.hadoop.io.FloatWritable; +import org.apache.hadoop.io.IntWritable; +import org.apache.hadoop.io.LongWritable; +import org.apache.hadoop.io.Text; + + +/** + * Util for any ObjectInspector related inspection and conversion of Hive data to/from Flink data. + * + * <p>Hive ObjectInspector is a group of flexible APIs to inspect value in different data representation, + * and developers can extend those API as needed, so technically, object inspector supports arbitrary data type in java. + */ +@Internal +public class HiveInspectors { + + /** + * Get conversion for converting Flink object to Hive object from an ObjectInspector. + */ + public static HiveObjectConversion getConversion(ObjectInspector inspector) { + if (inspector instanceof PrimitiveObjectInspector) { + if (inspector instanceof JavaBooleanObjectInspector) { + if (((JavaBooleanObjectInspector) inspector).preferWritable()) { + return o -> new BooleanWritable((Boolean) o); + } else { + return IdentityConversion.INSTANCE; + } + } else if (inspector instanceof JavaStringObjectInspector) { + if (((StringObjectInspector) inspector).preferWritable()) { + return o -> new Text((String) o); + } else { + return IdentityConversion.INSTANCE; + } + } else if (inspector instanceof JavaByteObjectInspector) { + if (((JavaByteObjectInspector) inspector).preferWritable()) { + return o -> new ByteWritable((Byte) o); + } else { + return IdentityConversion.INSTANCE; + } + } else if (inspector instanceof JavaShortObjectInspector) { + if (((JavaShortObjectInspector) inspector).preferWritable()) { + return o -> new ShortWritable((Short) o); + } else { + return IdentityConversion.INSTANCE; + } + } else if (inspector instanceof JavaIntObjectInspector) { + if (((JavaIntObjectInspector) inspector).preferWritable()) { + return o -> new IntWritable((Integer) o); + } else { + return IdentityConversion.INSTANCE; + } + } else if (inspector instanceof JavaLongObjectInspector) { + if (((JavaLongObjectInspector) inspector).preferWritable()) { + return o -> new LongWritable((Long) o); + } else { + return IdentityConversion.INSTANCE; + } + } else if (inspector instanceof JavaFloatObjectInspector) { + if (((JavaFloatObjectInspector) inspector).preferWritable()) { + return o -> new FloatWritable((Float) o); + } else { + return IdentityConversion.INSTANCE; + } + } else if (inspector instanceof JavaDoubleObjectInspector) { + if (((JavaDoubleObjectInspector) inspector).preferWritable()) { + return o -> new DoubleWritable((Double) o); + } else { + return IdentityConversion.INSTANCE; + } + } + } + + throw new FlinkHiveUDFException( + String.format("Flink doesn't support convert object conversion for %s yet", inspector)); + } + + /** + * Unwraps an object from Hive object to Flink object with an ObjectInspector. + */ + public static Object unwrap(ObjectInspector inspector, Object data) { Review comment: that's might be doable. I need to spend some time to take a look at it because, unlike DataFormatConverters, there's a subtle difference between Flink -> Hive and Hive -> Flink: From Flink-> Hive, it will always be thru `JavaXxxObjectInspector`. But from Hive -> Flink, it can be thru either `WritableXxxObjectInspector` or `JavaXxxObjectInspector` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
