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Posted to issues-all@impala.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2021/08/25 02:06:00 UTC

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

Quanlong Huang created IMPALA-10882:
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             Summary: 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


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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