feat(arrow): wire _pos virtual column through parquet reader#2413

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Shekharrajak:feat/1765-pos-virtual-column

Commits on May 7, 2026

feat(arrow): route reader-supplied virtual metadata columns through RecordBatchTransformer (#1765)
Shekharrajak
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feat(arrow): wire `_pos` through the parquet read pipeline (#1765)
Shekharrajak
committed
test(scan): cover `_pos` virtual column end-to-end (#1765)
Shekharrajak
committed