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Posted to issues@spark.apache.org by "Li Xian (Jira)" <ji...@apache.org> on 2021/03/25 02:22:00 UTC
[jira] [Created] (SPARK-34859) Vectorized parquet reader needs
synchronization among pages for column index
Li Xian created SPARK-34859:
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Summary: Vectorized parquet reader needs synchronization among pages for column index
Key: SPARK-34859
URL: https://issues.apache.org/jira/browse/SPARK-34859
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.2.0
Reporter: Li Xian
the current implementation has a problem. the pages returned by `readNextFilteredRowGroup` may not be aligned, some columns may have more rows than others.
Parquet is using `org.apache.parquet.column.impl.SynchronizingColumnReader` with `rowIndexes` to make sure that rows are aligned.
Currently `VectorizedParquetRecordReader` doesn't have such synchronizing among pages from different columns. Using `readNextFilteredRowGroup` may result in incorrect result.
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