Github user MaxGekk commented on the issue: https://github.com/apache/spark/pull/21657 > Do you mean we remove the option for column pruning in csv? I mean reverting back the index mapping - `tokenIndexArr`. In this case, your changes in `buildReader` are not needed. If `spark.sql.csv.parser.columnPruning.enabled`is set to `false`, the `tokenIndexArr` will map data index to required index. In the default case (`spark.sql.csv.parser.columnPruning.enabled` is `true`), the array is actually not needed, and it can be replaced by the identity function.
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