Github user sansanichfb commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/972#discussion_r85825494
--- Diff:
pxf/pxf-jdbc/src/main/java/org/apache/hawq/pxf/plugins/jdbc/JdbcPartitionFragmenter.java
---
@@ -0,0 +1,298 @@
+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 {
+ DATE,
+ INT,
+ ENUM;
+
+ public static PartitionType getType(String str) {
+ return valueOf(str.toUpperCase());
+ }
+ }
+
+ enum IntervalType {
+ DAY,
+ MONTH,
+ YEAR;
+
+ public static IntervalType type(String str) {
+ return valueOf(str.toUpperCase());
+ }
+ }
+
+ //The unit interval, in milliseconds, that is used to estimate the
number of slices for the date partition type
+ static Map<IntervalType, Long> intervals = new HashMap<IntervalType,
Long>();
+
+ static {
+ intervals.put(IntervalType.DAY, (long) 24 * 60 * 60 * 1000);
+ //30 days
+ intervals.put(IntervalType.MONTH, (long) 30 * 24 * 60 * 60 * 1000);
+ //365 days
+ intervals.put(IntervalType.YEAR, (long) 365 * 30 * 24 * 60 * 60 *
1000);
+ }
+
+ /**
+ * Constructor for JdbcPartitionFragmenter.
+ *
+ * @param inConf input data such as which Jdbc table to scan
+ * @throws UserDataException
+ */
+ public JdbcPartitionFragmenter(InputData inConf) throws
UserDataException {
+ super(inConf);
+ if(inConf.getUserProperty("PARTITION_BY") == null )
+ return;
+ try {
+ partitionBy =
inConf.getUserProperty("PARTITION_BY").split(":");
+ partitionColumn = partitionBy[0];
+ partitionType = PartitionType.getType(partitionBy[1]);
+
+ range = inConf.getUserProperty("RANGE").split(":");
+
+ //parse and validate parameter-INTERVAL
+ if (inConf.getUserProperty("INTERVAL") != null) {
+ interval = inConf.getUserProperty("INTERVAL").split(":");
+ intervalNum = Integer.parseInt(interval[0]);
+ if (interval.length > 1)
+ intervalType = IntervalType.type(interval[1]);
+ }
+ if (intervalNum < 1)
+ throw new UserDataException("The parameter{INTERVAL} must
> 1, but actual is '" + intervalNum+"'");
+ }catch (IllegalArgumentException e1){
+ throw new UserDataException(e1);
+ }catch (UserDataException e2){
+ throw e2;
+ }
+ }
+
+ /**
+ * Returns statistics for Jdbc table. Currently it's not implemented.
+ */
+ @Override
+ public FragmentsStats getFragmentsStats() throws Exception {
+ throw new UnsupportedOperationException("ANALYZE for Jdbc plugin
is not supported");
+ }
+
+ /**
+ * Returns list of fragments containing all of the
+ * Jdbc table data.
+ *
+ * @return a list of fragments
+ */
+ @Override
+ public List<Fragment> getFragments() throws Exception {
+ if(partitionType == null ) {
+ byte[] fragmentMetadata = null;
+ byte[] userData = null;
+ Fragment fragment = new Fragment(inputData.getDataSource(),
null, fragmentMetadata, userData);
+ fragments.add(fragment);
+ return prepareHosts(fragments);
+ }
+ switch (partitionType) {
+ case DATE: {
+ SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
+ Date t_start = df.parse(range[0]);
+ Date t_end = df.parse(range[1]);
+ int curr_interval = intervalNum;
+
+ Calendar frag_start = Calendar.getInstance();
--- End diff --
Should we use camel case fro variables naming?
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