Member since
10-16-2013
307
Posts
77
Kudos Received
59
Solutions
My Accepted Solutions
Title | Views | Posted |
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11246 | 04-17-2018 04:59 PM | |
6191 | 04-11-2018 10:07 PM | |
3559 | 03-02-2018 09:13 AM | |
22284 | 03-01-2018 09:22 AM | |
2653 | 02-27-2018 08:06 AM |
05-23-2016
08:44 AM
No, as CDH 5.7 includes Hive 1.1.0 plus backported fixes. But HPL/SQL is also available as a separate download and claims to work with any Hive version per their download page: http://www.hplsql.org/download
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05-19-2016
09:23 AM
Great thanks for your answer.
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03-10-2016
03:24 PM
I agree - just that some references were made to say flat file structures are efficient for Hadoop compare to start scheme structure interms of efficient for IO performance. But as you said it's very important to model it in a way it can work with BI tools.
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03-08-2016
11:06 PM
Hi Suresh, that solution seems fine to me. Changing the location of a single table with ALTER is atomic, but you won't be able to atomically change the locations of two tables simultaneously. Just something to be aware of. Alex
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03-02-2016
06:21 PM
Indeed there is, and the issue has been fixed! See: https://issues.cloudera.org/browse/IMPALA-2974 You can work around that specific problem in Impala by using the following syntax. ALTER TABLE A REPLACE COLUMNS (complete list of column definitions) My apologies for the inconvenience.
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02-03-2016
04:30 PM
1 Kudo
I agree that it is an important usability concern. I apologize for the inconvenience of having to track that information manually. We filed the following JIRA to track progress on the issue. Thanks for your feedback! https://issues.cloudera.org/browse/IMPALA-2942
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01-20-2016
11:50 AM
You can create a 1-row dummy table like this: select 1 id, 'a' d from (select 1) dual where 1 = 1 You also have to rewrite the query to avoid an uncorrelated not exists. You can do something like: select 1 id, 'a' d from (select 1) dual where (select count(*) from employee where empid > 20000) = 0 Computing the count might be expensive so you could add a limit like select 1 id, 'a' d from (select 1) dual where (select count(*) from (select id from employee where empid > 20000 limit 1) emp) = 0
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01-19-2016
10:27 PM
Yes, Impala is throwing that error. Impala has a few hard limitations on (1) the number of children an expression can have and (2) the depth of the expression tree. You can typically work around the problem by rephrasing the huge expression as a join on a new table. For example, in your example, you'd have something like: create table grid { lat_lower_bound double, lat_upper_bound double, long_lower_bound double, long_lower_bound } and then select ... from original_table t, grid g where t.longitude between g.lat_lower_bound and g.lat_upper_bound and t.latitute between g.long_lower_bound and g.long_upper_bound
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01-13-2016
11:10 PM
Ah, I got it. Tmr, I will try to compare the difference between first and second run by checking exec summary. MANY Thank you.
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01-07-2016
05:23 PM
Yea :). Thanks everyone for your reports and JIRA contricutions!
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