richardc-db opened a new pull request, #49021:
URL: https://github.com/apache/spark/pull/49021
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### What changes were proposed in this pull request?
https://github.com/apache/spark/commit/800faf0abfa368ad0a5ef1e0fa44b74dbaab724e
frees column vector resources between batches in columnar to row conversion.
However, like `WritableColumnVector`, `ConstantColumnVector` should not free
resources between batches because the same data is used across batches
### Why are the changes needed?
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Without this change, ConstantColumnVectors with string values, for example,
will fail if used with column->row conversion. For instance, reading a parquet
table partitioned by a string column with multiple batches.
### Does this PR introduce _any_ user-facing change?
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added UT that failed before and now passes
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no
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