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https://issues.apache.org/jira/browse/IMPALA-11414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang updated IMPALA-11414:
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Fix Version/s: Impala 4.1.1
> Off-by-one error in Parquet late materialization
> ------------------------------------------------
>
> Key: IMPALA-11414
> URL: https://issues.apache.org/jira/browse/IMPALA-11414
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Zoltán Borók-Nagy
> Assignee: Zoltán Borók-Nagy
> Priority: Major
> Fix For: Impala 4.2.0, Impala 4.1.1
>
>
> With PARQUET_LATE_MATERIALIZATION we can set the number of minimum
> consecutive rows that if filtered out, we avoid materialization of rows in
> other columns in parquet.
> E.g. if PARQUET_LATE_MATERIALIZATION is 10, and in a filtered column we find
> at least 10 consecutive rows that don't pass the predicates we avoid
> materializing the corresponding rows in the other columns.
> But due to an off-by-one error we actually only need
> (PARQUET_LATE_MATERIALIZATION - 1) consecutive elements. This means if we set
> PARQUET_LATE_MATERIALIZATION to one, then we need zero consecutive filtered
> out elements which leads to a crash/DCHECK. The bug is in the
> GetMicroBatches() algorithm when we produce the micro batches based on the
> selected rows.
> Setting PARQUET_LATE_MATERIALIZATION to 0 doesn't make sense so it shouldn't
> be allowed.
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