[jira] [Commented] (HIVE-707) add group_concat
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https://issues.apache.org/jira/browse/HIVE-707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14052301#comment-14052301
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Jian Wang commented on HIVE-707:
[~ph4t]
I use this concat_ws(' ', map_keys(UNION_MAP(MAP(your_column, 'dummy'
method instead of group_concat,but I got a error like this
{code}
FAILED: SemanticException [Error 10011]: Line 172:30 Invalid function
'UNION_MAP'
{/code}
should I add some jars ?
add group_concat
Key: HIVE-707
URL: https://issues.apache.org/jira/browse/HIVE-707
Project: Hive
Issue Type: New Feature
Components: Query Processor
Reporter: Namit Jain
Assignee: Min Zhou
Moving the discussion to a new jira:
I've implemented group_cat() in a rush, and found something difficult to
slove:
1. function group_cat() has a internal order by clause, currently, we can't
implement such an aggregation in hive.
2. when the strings will be group concated are too large, in another words,
if data skew appears, there is often not enough memory to store such a big
result.
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[jira] [Commented] (HIVE-707) add group_concat
[
https://issues.apache.org/jira/browse/HIVE-707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13593428#comment-13593428
]
Svetozar Misljencevic commented on HIVE-707:
You could use the currently undocumented union_map function as a workaround...
Try :
concat_ws(' ', map_keys(UNION_MAP(MAP(your_column, 'dummy'
add group_concat
Key: HIVE-707
URL: https://issues.apache.org/jira/browse/HIVE-707
Project: Hive
Issue Type: New Feature
Components: Query Processor
Reporter: Namit Jain
Assignee: Min Zhou
Moving the discussion to a new jira:
I've implemented group_cat() in a rush, and found something difficult to
slove:
1. function group_cat() has a internal order by clause, currently, we can't
implement such an aggregation in hive.
2. when the strings will be group concated are too large, in another words,
if data skew appears, there is often not enough memory to store such a big
result.
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[jira] [Commented] (HIVE-707) add group_concat
[ https://issues.apache.org/jira/browse/HIVE-707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13068182#comment-13068182 ] guyan commented on HIVE-707: hi all, this issue will be resolved? add group_concat Key: HIVE-707 URL: https://issues.apache.org/jira/browse/HIVE-707 Project: Hive Issue Type: New Feature Components: Query Processor Reporter: Namit Jain Assignee: Min Zhou Moving the discussion to a new jira: I've implemented group_cat() in a rush, and found something difficult to slove: 1. function group_cat() has a internal order by clause, currently, we can't implement such an aggregation in hive. 2. when the strings will be group concated are too large, in another words, if data skew appears, there is often not enough memory to store such a big result. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] Commented: (HIVE-707) add group_concat
[ https://issues.apache.org/jira/browse/HIVE-707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=12935463#action_12935463 ] Jeff Hammerbacher commented on HIVE-707: Hey, Given that this JIRA has been opened three separate times, and that I have received a recent request for it in IRC, I think it would be worth bumping to near the top of the queue. Thanks, Jeff add group_concat Key: HIVE-707 URL: https://issues.apache.org/jira/browse/HIVE-707 Project: Hive Issue Type: New Feature Components: Query Processor Reporter: Namit Jain Assignee: Min Zhou Moving the discussion to a new jira: I've implemented group_cat() in a rush, and found something difficult to slove: 1. function group_cat() has a internal order by clause, currently, we can't implement such an aggregation in hive. 2. when the strings will be group concated are too large, in another words, if data skew appears, there is often not enough memory to store such a big result. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
