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https://issues.apache.org/jira/browse/DRILL-2438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366315#comment-14366315
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Venki Korukanti commented on DRILL-2438:
----------------------------------------
This doesn't look related to views not storing nullability. For some reason an
extra cast is inserted to cast the result to integer.
{code}
00-01 Project(i_item_id=[$0], agg1=[$1])
00-02 SelectionVectorRemover
00-03 Limit(fetch=[5])
00-04 SelectionVectorRemover
00-05 TopN(limit=[5])
00-06 Project(i_item_id=[$0], agg1=[CAST(/(CastHigh(CASE(=($2,
0), null, $1)), $2)):INTEGER])
00-07 HashAgg(group=[{0}], agg#0=[$SUM0($1)],
agg#1=[COUNT($1)])
00-08 Project(i_item_id=[CASE(=(ITEM($0, 1), ''), null,
CAST(ITEM($0, 1)):VARCHAR(200) CHARACTER SET "ISO-8859-1" COLLATE
"ISO-8859-1$en_US$primary")], i_manufact_id=[CASE(=(ITEM($0, 13), ''), null,
CAST(ITEM($0, 13)):INTEGER)])
00-09 Scan(groupscan=[EasyGroupScan
[selectionRoot=/Users/hadoop/data/scale1/item.dat, numFiles=1,
columns=[`columns`[1], `columns`[13]],
files=[file:/Users/hadoop/data/scale1/item.dat]]])
{code}
> Query on views with Avg on integer column returns wrong result
> --------------------------------------------------------------
>
> Key: DRILL-2438
> URL: https://issues.apache.org/jira/browse/DRILL-2438
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 0.8.0
> Reporter: Abhishek Girish
> Assignee: Mehant Baid
> Priority: Critical
> Fix For: 0.9.0
>
>
> Git.Commit.ID: b3bdc27 (Mar 10)
> Average on an integer column returns an (inaccurate) integer value, instead
> of an (accurate) decimal value.
> *The following query returns wrong results:*
> {code:sql}
> > SELECT i_item_id, avg(i_manufact_id) agg1
> . . . . . . . . . . . . . . . . . > FROM item
> . . . . . . . . . . . . . . . . . > GROUP BY i_item_id
> . . . . . . . . . . . . . . . . . > ORDER BY i_item_id
> . . . . . . . . . . . . . . . . . > LIMIT 5;
> +------------+------------+
> | i_item_id | agg1 |
> +------------+------------+
> | AAAAAAAAAAABAAAA | 152 |
> | AAAAAAAAAAACAAAA | 187 |
> | AAAAAAAAAAAEAAAA | 251 |
> | AAAAAAAAAABAAAAA | 199 |
> | AAAAAAAAAABBAAAA | 636 |
> +------------+------------+
> 5 rows selected (0.324 seconds)
> {code}
> *Postgres results:*
> {code:sql}
> # SELECT i_item_id, avg(i_manufact_id) agg1
> tpcds1_new-# FROM item
> tpcds1_new-# GROUP BY i_item_id
> tpcds1_new-# ORDER BY i_item_id
> tpcds1_new-# LIMIT 5;
> i_item_id | agg1
> ------------------+----------------------
> AAAAAAAAAAABAAAA | 152.3333333333333333
> AAAAAAAAAAACAAAA | 373.0000000000000000
> AAAAAAAAAAAEAAAA | 251.0000000000000000
> AAAAAAAAAABAAAAA | 198.6666666666666667
> AAAAAAAAAABBAAAA | 636.0000000000000000
> (5 rows)
> {code}
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