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Posted to issues-all@impala.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2021/09/15 03:20:00 UTC

[jira] [Updated] (IMPALA-10882) Push down Min-Max predicates of CHAR/VARCHAR to ORC reader

     [ https://issues.apache.org/jira/browse/IMPALA-10882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang updated IMPALA-10882:
------------------------------------
    Priority: Critical  (was: Major)

> Push down Min-Max predicates of CHAR/VARCHAR to ORC reader
> ----------------------------------------------------------
>
>                 Key: IMPALA-10882
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10882
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Quanlong Huang
>            Priority: Critical
>
> This is a follow-up work of IMPALA-6505. Due to padding/truncation issues of CHAR/VARCHAR types when comparing to string literals, we might get wrong results if we simply push down CHAR/VARCHAR predicates into the ORC reader, especially when the file schema differs from the table schema.
> See more discussion in the Gerrit review: https://gerrit.cloudera.org/c/15403/1/be/src/exec/hdfs-orc-scanner.cc#889



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