carp84 commented on a change in pull request #8930: [FLINK-12955] HBase LookupableTableSource URL: https://github.com/apache/flink/pull/8930#discussion_r298981277
########## File path: flink-connectors/flink-hbase/src/main/java/org/apache/flink/connectors/hbase/table/HBaseLookupFunction.java ########## @@ -0,0 +1,201 @@ +/* + * 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.connectors.hbase.table; + +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.java.tuple.Tuple3; +import org.apache.flink.connectors.hbase.util.HBaseBytesSerializer; +import org.apache.flink.connectors.hbase.util.HBaseConfigurationUtil; +import org.apache.flink.connectors.hbase.util.HBaseTypeUtils; +import org.apache.flink.table.functions.FunctionContext; +import org.apache.flink.table.functions.TableFunction; +import org.apache.flink.types.Row; +import org.apache.flink.util.StringUtils; + +import org.apache.hadoop.hbase.HBaseConfiguration; +import org.apache.hadoop.hbase.HConstants; +import org.apache.hadoop.hbase.TableName; +import org.apache.hadoop.hbase.TableNotFoundException; +import org.apache.hadoop.hbase.client.Connection; +import org.apache.hadoop.hbase.client.ConnectionFactory; +import org.apache.hadoop.hbase.client.Get; +import org.apache.hadoop.hbase.client.HTable; +import org.apache.hadoop.hbase.client.Result; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.io.UnsupportedEncodingException; +import java.util.ArrayList; +import java.util.List; + +/** + * The HBaseLookupFunction is a standard user-defined table function, it can be used in tableAPI + * and also useful for temporal table join plan in SQL. + */ +public class HBaseLookupFunction extends TableFunction<Row> { + private static final Logger LOG = LoggerFactory.getLogger(HBaseLookupFunction.class); + private static final long serialVersionUID = 3831805737117914558L; + /** + * rowkey field index in source input row. + */ + private final int rowKeySourceIndex; + /** + * qualifier fields' indexes in source input row. + */ + private final List<Integer> qualifierSourceIndexes; + private final String hTableName; + private final List<Tuple3<byte[], byte[], TypeInformation<?>>> qualifierList; + /** + * field serializer for HBase format, order by field index of input row. + */ + private List<HBaseBytesSerializer> inputFieldSerializers; + private int rowKeyInternalTypeIndex; + private final int totalQualifiers; + private String charset; + private byte[] serializedConfig; + + private transient Connection hConnection; + protected transient HTable table; + + public HBaseLookupFunction(HBaseTableContext hBaseTableContext) throws IOException { + + this.hTableName = hBaseTableContext.gethTableName(); + // Configuration is not serializable + this.serializedConfig = HBaseConfigurationUtil.serializeConfiguration(hBaseTableContext.getHbaseClientConf()); + + this.totalQualifiers = hBaseTableContext.getTableSchema().getFieldCount() - 1; + + this.qualifierList = hBaseTableContext.gethBaseTableSchema().getFlatByteQualifiers(); + this.rowKeySourceIndex = hBaseTableContext.getRowKeyIndex(); + this.qualifierSourceIndexes = hBaseTableContext.getQualifierIndexes(); + this.charset = hBaseTableContext.gethBaseTableSchema().getStringCharset(); + this.inputFieldSerializers = new ArrayList<>(); + this.rowKeyInternalTypeIndex = HBaseTypeUtils.getTypeIndex(hBaseTableContext.getRowKeyType()); + + for (int index = 0; index <= totalQualifiers; index++) { + if (index == rowKeySourceIndex) { + inputFieldSerializers.add(new HBaseBytesSerializer(hBaseTableContext.getRowKeyType(), charset)); + } else { + Tuple3<byte[], byte[], TypeInformation<?>> typeInfo; + if (index < rowKeySourceIndex) { + typeInfo = qualifierList.get(index); + } else { + typeInfo = qualifierList.get(index - 1); + } + inputFieldSerializers.add(new HBaseBytesSerializer(typeInfo.f2, charset)); + } + } + } + + protected Get createGet(Object rowKey) throws IOException { + // currently this rowKey always be a binary type (adapt to sql-level type system) + byte[] rowkey = HBaseTypeUtils.serializeFromObject(rowKey, + rowKeyInternalTypeIndex, + HBaseTypeUtils.DEFAULT_CHARSET); + Get get = new Get(rowkey); + get.setMaxVersions(1); + // add request colums + for (Tuple3<byte[], byte[], TypeInformation<?>> typeInfo : qualifierList) { + get.addColumn(typeInfo.f0, typeInfo.f1); + } + return get; + } + + public void eval(Object rowKey) throws IOException { Review comment: This method is never used. 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