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https://issues.apache.org/jira/browse/DRILL-629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13989276#comment-13989276
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Mehant Baid commented on DRILL-629:
-----------------------------------
We use Float8 (which uses double) in the sum() aggregate function. I added the
double values 135540.7, 72730.13 in a standalone java program got the result
208270.83000000002 instead of 208270.83. This is just the imprecision with
double data type.
Note: Currently for sum() and avg() of numeric types (including decimal) we use
Float8 as the output type so its going to be approximate.
> SUM() group by results in wrong values
> --------------------------------------
>
> Key: DRILL-629
> URL: https://issues.apache.org/jira/browse/DRILL-629
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Ramana Inukonda Nagaraj
>
> Parquet file was created from pig, pig datatypes for the interested columns
> are long and double
> A select of the columns from the parquet file results in :
> 0: jdbc:drill:schema=dfs.drillTestDirTpch> select O_CUSTKEY,O_TOTALPRICE from
> orders where O_CUSTKEY=1499;
> +------------+--------------+
> | O_CUSTKEY | O_TOTALPRICE |
> +------------+--------------+
> | 1499 | 135540.7 |
> | 1499 | 72730.13 |
> +------------+--------------+
> 2 rows selected (1.275 seconds)
> However in a sum agg function grouped by the O_CUSTKEY results in
> select O_CUSTKEY,SUM(O_TOTALPRICE) from orders group by O_CUSTKEY;
> 1499 208270.83000000002
> as opposed to
> 1499 208270.83 which is the correct result.
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