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From Hari Sankar Sivarama Subramaniyan <hsubramani...@hortonworks.com>
Subject Re: Review Request 49965: HIVE-13995 Hive generates inefficient metastore queries for TPCDS tables with 1800+ partitions leading to higher compile time
Date Tue, 19 Jul 2016 22:14:51 GMT


> On July 19, 2016, 9:40 p.m., Ashutosh Chauhan wrote:
> > metastore/src/java/org/apache/hadoop/hive/metastore/MetaStoreDirectSql.java, lines
1255-1258
> > <https://reviews.apache.org/r/49965/diff/3/?file=1447530#file1447530line1255>
> >
> >     I don't think this null check is needed.

Ok, noticed we wont hit this code if partNames is null.


> On July 19, 2016, 9:40 p.m., Ashutosh Chauhan wrote:
> > ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java, line 310
> > <https://reviews.apache.org/r/49965/diff/3/?file=1447533#file1447533line310>
> >
> >     getPartsFound() should be set correctly from server and this means this logic
can be improved here.

In the case where partNames = null, does it not mean that we have retrieved column stats for
all the partitions and hence not set the colState to State.PARTIAL.


- Hari Sankar


-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/49965/#review142839
-----------------------------------------------------------


On July 19, 2016, 9:19 p.m., Hari Sankar Sivarama Subramaniyan wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/49965/
> -----------------------------------------------------------
> 
> (Updated July 19, 2016, 9:19 p.m.)
> 
> 
> Review request for hive and Ashutosh Chauhan.
> 
> 
> Repository: hive-git
> 
> 
> Description
> -------
> 
> Hive generates inefficient metastore queries for TPCDS tables with 1800+ partitions leading
to higher compile time
> 
> 
> Diffs
> -----
> 
>   metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java 38c0eed 
>   metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStoreClient.java 909d8eb

>   metastore/src/java/org/apache/hadoop/hive/metastore/MetaStoreDirectSql.java 9c900af

>   ql/src/java/org/apache/hadoop/hive/ql/optimizer/ppr/PartitionPruner.java 26e936e 
>   ql/src/java/org/apache/hadoop/hive/ql/parse/PrunedPartitionList.java da2e1e2 
>   ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java d8acf94 
> 
> Diff: https://reviews.apache.org/r/49965/diff/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Hari Sankar Sivarama Subramaniyan
> 
>


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