Issue Number: close #12574 This pr adds `NewJsonReader` which implements GenericReader interface to support read json format file. TODO: 1. modify `_scann_eof` later. 2. Rename `NewJsonReader` to `JsonReader` when `JsonReader` is deleted.
Issue Number: close #12574 This pr adds `NewJsonReader` which implements GenericReader interface to support read json format file. TODO: 1. modify `_scann_eof` later. 2. Rename `NewJsonReader` to `JsonReader` when `JsonReader` is deleted.