paul-rogers commented on a change in pull request #1962: DRILL-7554: Convert
LTSV Format Plugin to EVF
URL: https://github.com/apache/drill/pull/1962#discussion_r374458752
##########
File path:
contrib/format-ltsv/src/main/java/org/apache/drill/exec/store/ltsv/LTSVFormatPlugin.java
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@@ -15,78 +15,74 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
+
package org.apache.drill.exec.store.ltsv;
-import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.common.logical.StoragePluginConfig;
-import org.apache.drill.exec.ops.FragmentContext;
-import org.apache.drill.exec.planner.common.DrillStatsTable.TableStatistics;
+import org.apache.drill.common.types.TypeProtos;
+import org.apache.drill.common.types.Types;
+import
org.apache.drill.exec.physical.impl.scan.file.FileScanFramework.FileSchemaNegotiator;
+import
org.apache.drill.exec.physical.impl.scan.file.FileScanFramework.FileReaderFactory;
+import
org.apache.drill.exec.physical.impl.scan.file.FileScanFramework.FileScanBuilder;
+import org.apache.drill.exec.physical.impl.scan.framework.ManagedReader;
import org.apache.drill.exec.proto.UserBitShared;
import org.apache.drill.exec.server.DrillbitContext;
-import org.apache.drill.exec.store.RecordReader;
-import org.apache.drill.exec.store.RecordWriter;
-import org.apache.drill.exec.store.dfs.DrillFileSystem;
+import org.apache.drill.exec.server.options.OptionManager;
import org.apache.drill.exec.store.dfs.easy.EasyFormatPlugin;
-import org.apache.drill.exec.store.dfs.easy.EasyWriter;
-import org.apache.drill.exec.store.dfs.easy.FileWork;
+import org.apache.drill.exec.store.dfs.easy.EasySubScan;
+import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FileSystem;
-import org.apache.hadoop.fs.Path;
-import java.util.List;
public class LTSVFormatPlugin extends EasyFormatPlugin<LTSVFormatPluginConfig>
{
- private static final boolean IS_COMPRESSIBLE = true;
-
private static final String DEFAULT_NAME = "ltsv";
- public LTSVFormatPlugin(String name, DrillbitContext context, Configuration
fsConf, StoragePluginConfig storageConfig) {
- this(name, context, fsConf, storageConfig, new LTSVFormatPluginConfig());
- }
+ public static class LTSVReaderFactory extends FileReaderFactory {
+ private final LTSVFormatPluginConfig ltsvFormatPluginConfig;
- public LTSVFormatPlugin(String name, DrillbitContext context, Configuration
fsConf, StoragePluginConfig config, LTSVFormatPluginConfig formatPluginConfig) {
- super(name, context, fsConf, config, formatPluginConfig, true, false,
false, IS_COMPRESSIBLE, formatPluginConfig.getExtensions(), DEFAULT_NAME);
- }
+ public LTSVReaderFactory(LTSVFormatPluginConfig config) {
+ ltsvFormatPluginConfig = config;
+ }
- @Override
- public RecordReader getRecordReader(FragmentContext context, DrillFileSystem
dfs, FileWork fileWork, List<SchemaPath> columns, String userName) {
- return new LTSVRecordReader(context, fileWork.getPath(), dfs, columns);
+ @Override
+ public ManagedReader<? extends FileSchemaNegotiator> newReader() {
+ return new LTSVBatchReader(ltsvFormatPluginConfig);
Review comment:
So a reader normally works on a file split. But, we only give the reader the
plugin config. How does it know which file and/or block to read?
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