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[HIVE-1950] Block merge for RCFile - Hive - [issue]
...In our env, there are a lot of small files inside one partition/table. In order to reduce the namenode load, we have one dedicated housekeeping job running to merge these file. Right now the...
http://issues.apache.org/jira/browse/HIVE-1950    Author: He Yongqiang, 2014-10-17, 07:21
[HIVE-2206] add a new optimizer for query correlation discovery and optimization - Hive - [issue]
...This issue proposes a new logical optimizer called Correlation Optimizer, which is used to merge correlated MapReduce jobs (MR jobs) into a single MR job. The idea is based on YSmart (http:/...
http://issues.apache.org/jira/browse/HIVE-2206    Author: He Yongqiang, 2014-07-15, 07:57
[HIVE-1662] Add file pruning into Hive. - Hive - [issue]
...now hive support filename virtual column. if a file name filter presents in a query, hive should be able to only add files which passed the filter to input paths....
http://issues.apache.org/jira/browse/HIVE-1662    Author: He Yongqiang, 2014-07-03, 12:39
[HIVE-2089] Add a new input format to be able to combine multiple .gz text files - Hive - [issue]
...For files that is not splittable, CombineHiveInputFormat won't help. This jira is to add a new inputformat to support this feature. This is very useful for partitions with tens of thousands ...
http://issues.apache.org/jira/browse/HIVE-2089    Author: He Yongqiang, 2014-06-27, 18:25
[HIVE-1889] add an option (hive.index.compact.file.ignore.hdfs) to ignore HDFS location stored in index files. - Hive - [issue]
...In the current code, we use the whole hdfs path in index files to choose splits to run mapreduce job.If the data got moved or the name of the cluster got changed, the index data should still...
http://issues.apache.org/jira/browse/HIVE-1889    Author: He Yongqiang, 2014-04-05, 22:56
[HIVE-1953] Hive should process comments in CliDriver - Hive - [issue]
...If you put commend before a set command, it will faile. Like this:– TestSerDe is a user defined serde where the default delimiter is Ctrl-B– the user is overwriting it with ctrlC...
http://issues.apache.org/jira/browse/HIVE-1953    Author: He Yongqiang, 2013-04-09, 21:15
[HIVE-1384] HiveServer should run as the user who submitted the query. - Hive - [issue]
http://issues.apache.org/jira/browse/HIVE-1384    Author: He Yongqiang, 2013-02-09, 08:16
[HIVE-1472] reduce the usage of HashMap and List.iterator. - Hive - [issue]
...HashMap is used in a lot of places in Hive. Most times we can just replace it with native array. List.iterator() give a lot of pressure to Java GC, we should avoid it.Another thing we can al...
http://issues.apache.org/jira/browse/HIVE-1472    Author: He Yongqiang, 2013-01-20, 15:11
[HIVE-2101] mapjoin sometimes gives wrong results if there is a filter in the on condition - Hive - [issue]
..."SELECT / * + mapjoin(src1, src2) * / * FROM src src1 RIGHT OUTER JOIN src src2 ON (src1.key = src2.key AND src1.key < 10 AND src2.key > 10) JOIN src src3 ON (src2.key = src3.key AND s...
http://issues.apache.org/jira/browse/HIVE-2101    Author: He Yongqiang, 2012-12-19, 07:02
[HIVE-2095] auto convert map join bug - Hive - [issue]
...1) when considering to choose one table as the big table candidate for a map join, if at compile time, hive can find out that the total known size of all other tables excluding the big table...
http://issues.apache.org/jira/browse/HIVE-2095    Author: He Yongqiang, 2012-11-12, 21:01
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