fix: [df52] Fix/dictionary unpack tests #3473
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DataFusion 52 changed how FilterExec's batch coalescer works - streams now return Poll::Pending when accumulating input instead of blocking on a channel. Update test_unpack_dictionary_primitive and test_unpack_dictionary_string to poll the stream directly and send EOF on Pending, rather than using a separate mpsc channel/spawned task to feed batches. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Which issue does this PR close?
Closes #.
Rationale for this change
DataFusion 52 changed how FilterExec's batch coalescer works - streams now return Poll::Pending when accumulating input instead of blocking on a channel. Update test_unpack_dictionary_primitive and test_unpack_dictionary_string to poll the stream directly and send EOF on Pending, rather than using a separate mpsc channel/spawned task to feed batches.
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