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Posted to issues@impala.apache.org by "Peter Ebert (JIRA)" <ji...@apache.org> on 2017/05/11 21:52:04 UTC

[jira] [Created] (IMPALA-5311) Select count(*) queries show in incorrect compression in profile

Peter Ebert created IMPALA-5311:
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             Summary: Select count(*) queries show in incorrect compression in profile
                 Key: IMPALA-5311
                 URL: https://issues.apache.org/jira/browse/IMPALA-5311
             Project: IMPALA
          Issue Type: Bug
            Reporter: Peter Ebert
            Priority: Minor
             Fix For: Impala 2.9.0


If you run a count(*) query you will see the following in the profile:
File Formats: PARQUET/NONE:1 

if you then run a select * you will see the correct compression format:
File Formats: PARQUET/SNAPPY:14 

If the correct compression cannot be inferred without reading the data (presuming this happens because Impala just reads the parquet stats) might be better to put nothing at all instead of none.  Ideally though SNAPPY would display even on count(*).



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