fix: fix read parquert file when schema change #1750
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liurenjie1024
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Oct 17, 2025
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liurenjie1024
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Thanks @chenzl25 for this fix!
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Which issue does this PR close?
What changes are included in this PR?
ArrowReader::get_arrow_projection_maskto allow missing columns in the Parquet file, skipping them instead of returning an error. Missing columns are now gracefully skipped during projection, and theRecordBatchTransformeradds them later with NULL/default valuesAre these changes tested?
Testing schema evolution:
test_schema_evolution_add_columnto verify that reading an old Parquet file (with only column 'a') using a newer schema (with columns 'a' and 'b') works as expected. The test checks that missing columns are filled with NULLs and the original data is preserved.