public void setBaseAndInnerReader(
    final org.apache.hadoop.mapred.RecordReader<NullWritable,
        VectorizedRowBatch> baseReader) {
    this.baseReader = baseReader;
    this.innerReader = null;
    this.vectorizedRowBatchBase = baseReader.createValue();
  }
Generates a SearchArgument to push down to delete_delta files.


Note that bucket is a bit packed int, so even thought all delete events
for a given split have the same bucket ID but not the same "bucket" value
{@link BucketCodec}
ql/src/java/org/apache/hadoop/hive/ql/io/orc/VectorizedOrcAcidRowBatchReader.java