DX-82852: Nullify fieldReader when cleaning up listreader.#49

Merged

lriggs merged 1 commit intodremio:dremio_24.3_12.0from

lriggs:lriggs-listreader

Sep 27, 2023

Commits on Sep 15, 2023

Try nullifying fieldReader when cleaning up listreader.
lriggs
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