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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2168) Add HBaseTableSource
Date Fri, 20 Jan 2017 13:49:26 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15831769#comment-15831769
] 

ASF GitHub Bot commented on FLINK-2168:
---------------------------------------

Github user wuchong commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3149#discussion_r97073974
  
    --- Diff: flink-connectors/flink-hbase/src/main/java/org/apache/flink/addons/hbase/HBaseTableSource.java
---
    @@ -0,0 +1,75 @@
    +/*
    + * 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.addons.hbase;
    +
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +import org.apache.flink.api.java.DataSet;
    +import org.apache.flink.api.java.ExecutionEnvironment;
    +import org.apache.flink.api.java.typeutils.RowTypeInfo;
    +import org.apache.flink.table.sources.BatchTableSource;
    +import org.apache.flink.table.sources.ProjectableTableSource;
    +import org.apache.flink.types.Row;
    +import org.apache.flink.util.Preconditions;
    +import org.apache.hadoop.conf.Configuration;
    +
    +/**
    + * Creates a table source that helps to scan data from an hbase table
    + *
    + * Note : the colNames are specified along with a familyName and they are seperated by
a ':'
    + * For eg, cf1:q1 - where cf1 is the familyName and q1 is the qualifier name
    + */
    +public class HBaseTableSource implements BatchTableSource<Row>, ProjectableTableSource<Row>
{
    +
    +	private Configuration conf;
    +	private String tableName;
    +	private byte[] rowKey;
    +	private String[] colNames;
    +	private TypeInformation<?>[] colTypes;
    +
    +	public HBaseTableSource(Configuration conf, String tableName, byte[] rowKey, String[]
colNames,
    +							TypeInformation<?>[] colTypes) {
    +		this.conf = conf;
    +		this.tableName = Preconditions.checkNotNull(tableName, "Table  name");
    +		this.rowKey = Preconditions.checkNotNull(rowKey, "Rowkey");
    --- End diff --
    
    Hi @ramkrish86 , the RowTypeInfo contains field types and also field names (default f1~fn)
of the table. By using `RowTypeInfo(TypeInformation[] types, String[] fieldNames)` constructor,
we can customize the field names of the table. So in your case, you can query columns by `.sql(SELECT
person.name, person.age FROM test)`.


> Add HBaseTableSource
> --------------------
>
>                 Key: FLINK-2168
>                 URL: https://issues.apache.org/jira/browse/FLINK-2168
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>    Affects Versions: 0.9
>            Reporter: Fabian Hueske
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Minor
>              Labels: starter
>
> Add a {{HBaseTableSource}} to read data from a HBase table. The {{HBaseTableSource}}
should implement the {{ProjectableTableSource}} (FLINK-3848) and {{FilterableTableSource}}
(FLINK-3849) interfaces.
> The implementation can be based on Flink's {{TableInputFormat}}.



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