Expose arrow schema on async avro reader#9533
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mzabaluev-flarion wants to merge 3 commits intoapache:mainfrom
Closed
Expose arrow schema on async avro reader#9533mzabaluev-flarion wants to merge 3 commits intoapache:mainfrom
mzabaluev-flarion wants to merge 3 commits intoapache:mainfrom
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Add a schema method to obtain the Arrow schema from the async Avro reader.
Tests on alltypes_plain.avro
Add metadata on fields of nested records and the list type, so that the expected schema matches the one produced by the reader. Add a test reading nested_records.avro to verify the schema exposed by the reader.
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Rationale for this change
Exposes the Arrow schema produced by the async Avro file reader, similarly to the
schemamethod on the synchronous reader.This allows an application to prepare casting or other schema transformations with no need to fetch the first record batch to learn the produced Arrow schema. Since the async reader only parses OCF content for the moment, the schema does not change from batch to batch.
What changes are included in this PR?
The
schemamethod forAsyncAvroFileReaderexposes the Arrow schema of record batches that are produced by the reader.Are these changes tested?
Added tests verifying that the returned schema matches the expected.
Are there any user-facing changes?
Added a
schemamethod toAsyncAvroFileReader.