Adding record reader config/context param to record transformer

pinot-core/src/main/java/org/apache/pinot/core/segment/processing/mapper/SegmentMapper.java

@@ -139,13 +139,11 @@ private Map<String, GenericRowFileManager> doMap()
     int totalNumRecordReaders = _recordReaderFileConfigs.size();
     GenericRow reuse = new GenericRow();
     for (RecordReaderFileConfig recordReaderFileConfig : _recordReaderFileConfigs) {
-      RecordReader recordReader = recordReaderFileConfig.getRecordReader();
-
       // Mapper can terminate midway of reading a file if the intermediate file size has crossed the configured
       // threshold. Map phase will continue in the next iteration right where we are leaving off in the current
       // iteration.
       boolean shouldMapperTerminate =
-          !completeMapAndTransformRow(recordReader, reuse, observer, count, totalNumRecordReaders);
+          !completeMapAndTransformRow(recordReaderFileConfig, reuse, observer, count, totalNumRecordReaders);
 
       // Terminate the map phase if intermediate file size has crossed the threshold.
       if (shouldMapperTerminate) {
@@ -164,9 +162,10 @@ private Map<String, GenericRowFileManager> doMap()
 
 //   Returns true if the map phase can continue, false if it should terminate based on the configured threshold for
 //   intermediate file size during map phase.
-  private boolean completeMapAndTransformRow(RecordReader recordReader, GenericRow reuse,
+  private boolean completeMapAndTransformRow(RecordReaderFileConfig recordReaderFileConfig, GenericRow reuse,
       Consumer<Object> observer, int count, int totalCount) throws Exception {
     observer.accept(String.format("Doing map phase on data from RecordReader (%d out of %d)", count, totalCount));
+    RecordReader recordReader = recordReaderFileConfig.getRecordReader();
     while (recordReader.hasNext() && (_adaptiveSizeBasedWriter.canWrite())) {
       reuse = recordReader.next(reuse);
       _recordEnricherPipeline.run(reuse);
@@ -176,13 +175,13 @@ private boolean completeMapAndTransformRow(RecordReader recordReader, GenericRow
       if (reuse.getValue(GenericRow.MULTIPLE_RECORDS_KEY) != null) {
         //noinspection unchecked
         for (GenericRow row : (Collection<GenericRow>) reuse.getValue(GenericRow.MULTIPLE_RECORDS_KEY)) {
-          GenericRow transformedRow = _recordTransformer.transform(row);
+          GenericRow transformedRow = _recordTransformer.transform(row, recordReaderFileConfig);
           if (transformedRow != null && IngestionUtils.shouldIngestRow(transformedRow)) {
             writeRecord(transformedRow);
           }
         }
       } else {
-        GenericRow transformedRow = _recordTransformer.transform(reuse);
+        GenericRow transformedRow = _recordTransformer.transform(reuse, recordReaderFileConfig);
         if (transformedRow != null && IngestionUtils.shouldIngestRow(transformedRow)) {
           writeRecord(transformedRow);
         }

pinot-segment-local/src/main/java/org/apache/pinot/segment/local/recordtransformer/CompositeTransformer.java

@@ -28,7 +28,7 @@
 import org.apache.pinot.spi.config.table.TableConfig;
 import org.apache.pinot.spi.data.Schema;
 import org.apache.pinot.spi.data.readers.GenericRow;
-
+import org.apache.pinot.spi.data.readers.RecordReaderConfig;
 
 /**
  * The {@code CompositeTransformer} class performs multiple transforms based on the inner {@link RecordTransformer}s.
@@ -115,12 +115,19 @@ public CompositeTransformer(List<RecordTransformer> transformers) {
 
   @Nullable
   @Override
-  public GenericRow transform(GenericRow record) {
+  public GenericRow transform(GenericRow genericRow) {
+    return transform(genericRow, null);
+  }
+
+  @Nullable
+  @Override
+  public GenericRow transform(GenericRow record,
+      RecordReaderConfig recordReaderConfig) {
     for (RecordTransformer transformer : _transformers) {
       if (!IngestionUtils.shouldIngestRow(record)) {
         return record;
       }
-      record = transformer.transform(record);
+      record = transformer.transform(record, recordReaderConfig);
       if (record == null) {
         return null;
       }

pinot-segment-local/src/main/java/org/apache/pinot/segment/local/recordtransformer/RecordTransformer.java

@@ -21,7 +21,7 @@
 import java.io.Serializable;
 import javax.annotation.Nullable;
 import org.apache.pinot.spi.data.readers.GenericRow;
-
+import org.apache.pinot.spi.data.readers.RecordReaderConfig;
 
 /**
  * The record transformer which takes a {@link GenericRow} and transform it based on some custom rules.
@@ -43,4 +43,14 @@ default boolean isNoOp() {
    */
   @Nullable
   GenericRow transform(GenericRow record);
+
+  /**
+   * Transforms a record based on some custom rules using record reader context.
+   * @param record Record to transform
+   * @return Transformed record, or {@code null} if the record does not follow certain rules.
+   */
+  @Nullable
+  default GenericRow transform(GenericRow record, RecordReaderConfig recordReaderConfig) {
+    return transform(record);
+  }
 }

pinot-spi/src/main/java/org/apache/pinot/spi/data/readers/RecordReaderFileConfig.java

@@ -29,7 +29,7 @@
  * RecordReader can be initialized just when its about to be used, which avoids early/eager
  * initialization/memory allocation.
  */
-public class RecordReaderFileConfig {
+public class RecordReaderFileConfig implements RecordReaderConfig {
   public final FileFormat _fileFormat;
   public final File _dataFile;
   public final Set<String> _fieldsToRead;