paul-rogers opened a new pull request #1922: DRILL-7476: Set lastSet on TransferPair copies URL: https://github.com/apache/drill/pull/1922 Variable-width nullable vectors maintain a "lastSet" field in the mutator. This field is used in "fill empties" logic when setting the vector's value count. This is true even if the vector is read-only, or has been transferred from another (read-only) vector. LastSet must be set to the row count or the code will helpfully overwrite existing offsets with 0. Added batch validation code to catch this problem should it happen again. Includes minor code cleanup in files visited during debugging.
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