Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/19943
After minimizing `nextBatch`, it becomes smaller than Parquet's
`nextBatch`. But, it's inlined only some cases, but mostly not. It's not
helpful. For the other technique, I'll try later.
```
org.apache.spark.sql.execution.datasources.orc.OrcColumnarBatchReader::nextBatch
(107 bytes) inline (hot)
```
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