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https://issues.apache.org/jira/browse/HIVE-3582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547604#comment-13547604
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Phabricator commented on HIVE-3582:
-----------------------------------
zhenxiao has commented on the revision "HIVE-3582 [jira] NPE in union
processing followed by lateral view followed by 2 group bys".
INLINE COMMENTS
ql/src/java/org/apache/hadoop/hive/ql/lib/Utils.java:54 More comments here?
Find Node of specific target type in the stack
Maybe a more meaningful name, findTargetTypeNode() ?
ql/src/java/org/apache/hadoop/hive/ql/optimizer/MapJoinFactory.java:360 Maybe:
boolean local = (pos != mapJoin.getConf().getPosBigTable());
ql/src/test/queries/clientpositive/union_lateralview2.q:2 Is it possible to
simplify the query?
I mean, select less fields, less columns in group by, only keep the simplest
query to reproduce the exception.
Also, do an ORDER BY to preserve the result order, or select count(*) with
limit to reduce the result size.
REVISION DETAIL
https://reviews.facebook.net/D6051
To: JIRA, navis
Cc: zhenxiao
> NPE in union processing followed by lateral view followed by 2 group bys
> ------------------------------------------------------------------------
>
> Key: HIVE-3582
> URL: https://issues.apache.org/jira/browse/HIVE-3582
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Navis
> Attachments: HIVE-3582.D6051.1.patch
>
>
> EXPLAIN
> SELECT e.key, e.arr_ele, count(1) FROM (
> SELECT d.key as key, d.arr_ele as arr_ele, d.value as value, count(1) as
> cnt FROM (
> SELECT c.arr_ele as arr_ele, a.key as key, a.value as value FROM (
> SELECT key, value, array(1,2,3) as arr
> FROM src
> UNION ALL
>
> SELECT key, value, array(1,2,3) as arr
> FROM srcpart
> WHERE ds = '2008-04-08' and hr='12'
> ) a LATERAL VIEW EXPLODE(arr) c AS arr_ele
> ) d group by d.key, d.arr_ele, d.value
> ) e group by e.key, e.arr_ele;
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