Github user jiadexin commented on a diff in the pull request: https://github.com/apache/incubator-hawq/pull/972#discussion_r86278188 --- Diff: pxf/pxf-jdbc/src/main/java/org/apache/hawq/pxf/plugins/jdbc/JdbcPartitionFragmenter.java --- @@ -0,0 +1,297 @@ +package org.apache.hawq.pxf.plugins.jdbc; + +/* + * 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. + */ + +import org.apache.hawq.pxf.api.Fragmenter; +import org.apache.hawq.pxf.api.FragmentsStats; +import org.apache.hawq.pxf.api.UserDataException; +import org.apache.hawq.pxf.plugins.jdbc.utils.DbProduct; +import org.apache.hawq.pxf.plugins.jdbc.utils.ByteUtil; +import org.apache.hawq.pxf.api.Fragment; +import org.apache.hawq.pxf.api.utilities.InputData; + +import java.net.InetAddress; +import java.text.SimpleDateFormat; +import java.util.*; + +/** + * Fragmenter class for JDBC data resources. + * + * Extends the {@link Fragmenter} abstract class, with the purpose of transforming + * an input data path (an JDBC Database table name and user request parameters) into a list of regions + * that belong to this table. + * <p> + * <h4>The parameter Patterns </h4> + * There are three parameters, the format is as follows:<p> + * <pre> + * <code>PARTITION_BY=column_name:column_type&RANGE=start_value[:end_value]&INTERVAL=interval_num[:interval_unit]</code> + * </pre> + * The <code>PARTITION_BY</code> parameter can be split by colon(':'),the <code>column_type</code> current supported : <code>date,int,enum</code> . + * The Date format is 'yyyy-MM-dd'. <p> + * The <code>RANGE</code> parameter can be split by colon(':') ,used to identify the starting range of each fragment. + * The range is left-closed, ie:<code> '>= start_value AND < end_value' </code>.If the <code>column_type</code> is <code>int</code>, + * the <code>end_value</code> can be empty. If the <code>column_type</code>is <code>enum</code>,the parameter <code>RANGE</code> can be empty. <p> + * The <code>INTERVAL</code> parameter can be split by colon(':'), indicate the interval value of one fragment. + * When <code>column_type</code> is <code>date</code>,this parameter must be split by colon, and <code>interval_unit</code> can be <code>year,month,day</code>. + * When <code>column_type</code> is <code>int</code>, the <code>interval_unit</code> can be empty. + * When <code>column_type</code> is <code>enum</code>,the <code>INTERVAL</code> parameter can be empty. + * </p> + * <p> + * The syntax examples is :<p> + * <code>PARTITION_BY=createdate:date&RANGE=2008-01-01:2010-01-01&INTERVAL=1:month'</code> <p> + * <code>PARTITION_BY=year:int&RANGE=2008:2010&INTERVAL=1</code> <p> + * <code>PARTITION_BY=grade:enum&RANGE=excellent:good:general:bad</code> + * </p> + * + */ +public class JdbcPartitionFragmenter extends Fragmenter { + String[] partitionBy = null; + String[] range = null; + String[] interval = null; + PartitionType partitionType = null; + String partitionColumn = null; + IntervalType intervalType = null; + int intervalNum = 1; + + enum PartitionType { --- End diff -- At present support of these three kinds of commonly used, the future can also increase other types.
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