Github user ravipesala commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/2127#discussion_r179905093
--- Diff:
store/sdk/src/main/java/org/apache/carbondata/store/LocalCarbonStore.java ---
@@ -0,0 +1,111 @@
+/*
+ * 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.carbondata.store;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.carbondata.common.annotations.InterfaceAudience;
+import org.apache.carbondata.core.datastore.row.CarbonRow;
+import org.apache.carbondata.core.metadata.schema.table.CarbonTable;
+import org.apache.carbondata.core.scan.expression.Expression;
+import org.apache.carbondata.hadoop.CarbonProjection;
+import org.apache.carbondata.hadoop.api.CarbonTableInputFormat;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.mapreduce.InputSplit;
+import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.JobID;
+import org.apache.hadoop.mapreduce.RecordReader;
+import org.apache.hadoop.mapreduce.TaskAttemptID;
+import org.apache.hadoop.mapreduce.task.JobContextImpl;
+import org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl;
+
+/**
+ * A CarbonStore implementation that works locally, without other compute
framework dependency.
+ * It can be used to read data in local disk.
+ *
+ * Note that this class is experimental, it is not intended to be used in
production.
+ */
+@InterfaceAudience.Internal
+class LocalCarbonStore extends MetaCachedCarbonStore {
+
+ @Override
+ public CarbonRow[] scan(String path, String[] projectColumns) throws
IOException {
+return scan(path, projectColumns, null);
+ }
+
+ @Override
+ public CarbonRow[] scan(String path, String[] projectColumns, Expression
filter)
+ throws IOException {
+CarbonTable table = getTable(path);
+if (table.isStreamingTable() || table.isHivePartitionTable()) {
+ throw new UnsupportedOperationException("streaming and partition
table is not supported");
+}
+// TODO: use InputFormat to prune data and read data
+
+final CarbonTableInputFormat format = new CarbonTableInputFormat();
+final Job job = new Job(new Configuration());
+format.setTableInfo(job.getConfiguration(), table.getTableInfo());
+format.setTablePath(job.getConfiguration(), table.getTablePath());
+format.setTableName(job.getConfiguration(), table.getTableName());
+format.setDatabaseName(job.getConfiguration(),
table.getDatabaseName());
+format.setCarbonReadSupport(job.getConfiguration(),
CarbonRowReadSupport.class);
+if (filter != null) {
+ format.setFilterPredicates(job.getConfiguration(), filter);
+}
+if (projectColumns != null) {
--- End diff --
what is the behavior if the user does not provide projections?
---
