Github user mravi commented on a diff in the pull request:
https://github.com/apache/incubator-phoenix/pull/22#discussion_r11146551
--- Diff:
phoenix-pig/src/main/java/org/apache/phoenix/pig/hadoop/PhoenixInputFormat.java
---
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2010 The Apache Software Foundation
+ *
+ * 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 maynot 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 applicablelaw 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.phoenix.pig.hadoop;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.List;
+
+import javax.security.auth.login.Configuration;
+
+import org.apache.phoenix.pig.PhoenixPigConfiguration;
+
+public final class PhoenixInputFormat extends InputFormat<NullWritable,
PhoenixRecord> {
+
+ private static final Log LOG =
LogFactory.getLog(PhoenixInputFormat.class);
+ private PhoenixPigConfiguration config;
+
+ /**
+ * instantiated by framework
+ */
+ public PhoenixInputFormat() {
+ }
+
+ @Override
+ public RecordReader<NullWritable, PhoenixRecord>
createRecordReader(InputSplit split, TaskAttemptContext context)
+ throws IOException, InterruptedException {
+
+ final PhoenixPigConfiguration pigConfiguration =
getPhoenixConfiguration(context);
+ return new PhoenixRecordReader(pigConfiguration);
+ }
+
+
+
+ @Override
+ public List<InputSplit> getSplits(JobContext context) throws
IOException, InterruptedException {
+
+ List<InputSplit> splits = null;
+ try{
+ Configuration configuration = context.getConfiguration();
+ this.config = new PhoenixPigConfiguration(configuration);
+ final Connection connection = config.getConnection(true);
+ final String selectStatement = config.getSelectStatement();
+ Preconditions.checkNotNull(selectStatement);
+
+ final Statement statement = connection.createStatement();
+ final PhoenixStatement pstmt =
statement.unwrap(PhoenixStatement.class);
+ final QueryPlan queryPlan =
pstmt.compileQuery(selectStatement);
+ @SuppressWarnings("unused")
+ final ResultIterator iterator = queryPlan.iterator();
+ final List<KeyRange> allSplits = queryPlan.getSplits();
+ splits = getValidSplits(queryPlan,allSplits);
+ } catch(SQLException sqlE) {
+ LOG.error(String.format(" Error [%s] in getSplits of
PhoenixInputFormat ", sqlE.getMessage()));
+ Throwables.propagate(sqlE);
+ }
+ return splits;
+ }
+
+ private List<InputSplit> getValidSplits(final QueryPlan qplan, final
List<KeyRange> splits) throws IOException {
--- End diff --
ORDER BY and LIMIT clauses needs a Reducer task which isn't the case with a
LOAD as Pig runs only Map tasks. Initially, I planned to just support a LOAD
statement of the form below similar to the PhoenixHBaseStorage
A = LOAD 'hbase/table/HIRES' using
org.apache.phoenix.pig.PhoenixHBaseLoader('localhost');
However, since people had asked for providing support for SELECT queries
also, I notice these confusions are arising. We can provide support for a
SELECT query but it will be a simple SELECT query with a support for WHERE
clause without any aggregations, topN queries.
My bad, I shouldn't have used the word "hand off" above though I meant to
say hand the code for a release.
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