[jira] [Commented] (IMPALA-10660) Impala shell prints DOUBLEs with less precision in HS2 than beeswax

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-10660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17608821#comment-17608821 ] 

ASF subversion and git services commented on IMPALA-10660:
----------------------------------------------------------

Commit 81e36d45844e41e0edf5f51c03b3abdae1094cbd in impala's branch refs/heads/master from Peter Rozsa
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=81e36d458 ]

IMPALA-10660: Impala shell prints DOUBLEs with less precision in HS2 than beeswax

This change adds a shell option called "hs2_fp_format"
which manipulates the print format of floating-point values in HS2.
It lets the user to specify a Python-based format specification
expression (https://docs.python.org/2.7/library/string.html#formatspec)
which will get parsed and applied to floating-point
column values. The default value is None, in this case the
formatting is the same as the state before this change.
This option does not support the Beeswax protocol, because Beeswax
converts all of the column values to strings in its response.

Tests: command line tests for various formatting options and
       for invalid formatting option

Change-Id: I424339266be66437941be8bafaa83fa0f2dfbd4e
Reviewed-on: http://gerrit.cloudera.org:8080/18990
Reviewed-by: Impala Public Jenkins <im...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>


> Impala shell prints DOUBLEs with less precision in HS2 than beeswax
> -------------------------------------------------------------------
>
>                 Key: IMPALA-10660
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10660
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Clients
>            Reporter: Csaba Ringhofer
>            Assignee: Peter Rozsa
>            Priority: Major
>              Labels: ramp-up
>
> python shell/impala_shell.py --protocol hs2
> select cast("0.123451234512345" as double);
> result: 0.123451234512 (looses precision)
> python shell/impala_shell.py --protocol beeswax
> select cast("0.123451234512345" as double);
> result 0.123451234512345 (no precision loss)



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