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[DRILL-1957] NULL values in NOT IN sub-queries could lead to incorrect query result. - Drill - [issue]
...NULL values in NOT IN sub-queries will disqualify all the rows, and hence return 0 row for a query. However, Drill could return some rows, due to issue in the query planning.For example, con...
http://issues.apache.org/jira/browse/DRILL-1957    Author: Jinfeng Ni, 2015-04-24, 18:42
[expand - 1 more] - Re: Should we make dir* columns only exist when requested? - Drill - [mail # dev]
...To Parth's question,1) SELECT * FROM `*/subdir/data.json` WHERE `dir0` = '2015-04-03`dir[i] would not returned.2) SELECT dir0, * FROM `*/subdir/data.json` WHERE `dir0` = '2015-04-03`dir0 wou...
   Author: Jinfeng Ni, 2015-04-24, 01:18
[DRILL-2761] ParquetGroupScan copy constructor only copy reference, leading to out-sync ParquetGroupScan instance. - Drill - [issue]
...ParquetGroupScan has one copy constructor, which will be used in project pushdown rule and partition pruning rule to clone a modified version of original ParquetGroupScan instance. However, ...
http://issues.apache.org/jira/browse/DRILL-2761    Author: Jinfeng Ni, 2015-04-23, 16:52
Re: Query performance Comparison - Drill and Impala - Drill - [mail # user]
...The query you used is a 15-table join query. We know that Drill's costbased optimizer will see performance overhead increase significantly withincreased # of tables joined, due to the increa...
   Author: Jinfeng Ni, 2015-04-21, 21:32
Re: [DISCUSS] improve physical plan formatting - Drill - [mail # dev]
...+1.Increased indentation is required not only for join, but for any operatorwhich takes more than 1 inputs.  Union / Union All would be anotherexample.On Mon, Apr 13, 2015 at 12:39 PM, ...
   Author: Jinfeng Ni, 2015-04-13, 20:25
[DRILL-2630] Merge join over inputs with complex type hit run-time code compiler error - Drill - [issue]
...Hit run-time code complier error, if we have a merge join whose inputs contain complex type.select * from sys.version;+------------+----------------+-------------+-------------+------------+...
http://issues.apache.org/jira/browse/DRILL-2630    Author: Jinfeng Ni, 2015-04-09, 20:17
[DRILL-2579] JDBC unit tests will time out after one testcase fails with unexpected results.   - Drill - [issue]
...In unit testcase such as TestJdbcQuery, if there is one failing unit testcase  due to unexpected results, then the rest of unit test cases will hit timeout issue. See following stack tr...
http://issues.apache.org/jira/browse/DRILL-2579    Author: Jinfeng Ni, 2015-04-08, 18:20
Re: Counting large numbers of unique values - Drill - [mail # user]
...ASAIK, Drill's planner currently does not expose the sort-ness ofunderlying data; if the data is pre-sorted, Drill planner would notrecognize that, and still would require a sort operator fo...
   Author: Jinfeng Ni, 2015-04-07, 22:45
Re: TSV with a JSON column? - Drill - [mail # user]
...That's right.  columns[1] from tsv file is regarded as a VARCHAR column.You have to use convert_from function.0: jdbc:drill:zk=local> select t.colA.v from (selectconvert_from(columns...
   Author: Jinfeng Ni, 2015-04-03, 14:07
Re: [VOTE] Release Apache Drill 0.8.0 (rc1) - Drill - [mail # dev]
...+1* Download src tar ball and run full build on Mac OS twice.  Run severalsample queries. All are good.* Verified md5 / sha1 checksumFor DRILL-2458, I feel this is not a show stopper, s...
   Author: Jinfeng Ni, 2015-03-28, 18:14
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB