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Posted to issues@drill.apache.org by "Mehant Baid (JIRA)" <ji...@apache.org> on 2014/06/18 08:24:01 UTC
[jira] [Updated] (DRILL-1007) decimal38 comparison with double
failed on some values
[ https://issues.apache.org/jira/browse/DRILL-1007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mehant Baid updated DRILL-1007:
-------------------------------
Attachment: DRILL-1007.patch
> decimal38 comparison with double failed on some values
> ------------------------------------------------------
>
> Key: DRILL-1007
> URL: https://issues.apache.org/jira/browse/DRILL-1007
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Drill
> Reporter: Chun Chang
> Assignee: Mehant Baid
> Attachments: DRILL-1007.patch
>
>
> comparison between double and decimal38 fails for some values like:
> 0 vs -0.000000010000000000
> -56789012345.1234 vs -999999999999999999.000000000000000000
> For example, the following query yields the following results with postgres:
> foodmart=# select c_row, c_float8, cast(c_decimal38 as decimal(38,18)) from data where c_row < 15 and c_float8 > cast(c_decimal38 as decimal(38,18));
> c_row | c_float8 | c_decimal38
> -------+-------------------+----------------------------------------
> 1 | 10.5 | 0.000000000000000000
> 2 | 10.5 | 1.000000000000000000
> 4 | 123456789012345 | 999999999.000000000000000000
> 5 | 999999999999999 | -999999999.000000000000000000
> 7 | 0 | -0.000000010000000000
> 11 | -56789012345.1234 | -999999999999999999.000000000000000000
> 13 | 2147483647 | -0.000000000000000010
> (7 rows)
> with Drill, two rows are missing due to failed comparison:
> 0: jdbc:drill:schema=dfs> select c_row, c_float8, cast(c_decimal38 as decimal(38,18)) from data where c_row < 15 and c_float8 > cast(c_decimal38 as decimal(38,18));
> +------------+------------+------------+
> | c_row | c_float8 | EXPR$2 |
> +------------+------------+------------+
> | 1 | 10.5 | 0E-18 |
> | 2 | 10.5 | 1.000000000000000000 |
> | 4 | 1.23456789012345E14 | 999999999.000000000000000000 |
> | 5 | 9.99999999999999E14 | -999999999.000000000000000000 |
> | 13 | 2.147483647E9 | -1.0E-17 |
> +------------+------------+------------+
> 5 rows selected (0.156 seconds)
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