GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/17232
[SPARK-18112] [SQL] Support reading data from Hive 2.1 metastore [WIP]
### What changes were proposed in this pull request?
This PR is to support reading data from Hive 2.1 metastore. Need to update
shim class because of the Hive API changes caused by the following two Hive
JIRAs:
- [HIVE-12730 MetadataUpdater: provide a mechanism to edit the basic
statistics of a table (or a
partition)](https://issues.apache.org/jira/browse/HIVE-12730)
- [Hive-13341 Stats state is not captured correctly: differentiate load
table and create table](https://issues.apache.org/jira/browse/HIVE-13341)
There two new fields have been added in Hive.
- `EnvironmentContext environmentContext`. So far, this is always set to
`null`. This was introduced for supporting DDL `alter table s update statistics
set ('numRows'='NaN')`. Using this DDL, users can specify the statistics. So
far, our Spark SQL does not need it, because we use different table properties
to store our generated statistics values. However, when Spark SQL issues ALTER
TABLE DDL statements, Hive metastore always automatically invalidate the
Hive-generated statistics. In the follow-up PR, we can fix it by explicitly
adding a property to `environmentContext`.
```JAVA
putToProperties(StatsSetupConst.STATS_GENERATED, StatsSetupConst.USER)
```
- `boolean hasFollowingStatsTask`. We always set it to `false`. TODO: more
investigation about this
### How was this patch tested?
Added test cases to VersionsSuite.scala
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark Hive21
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17232.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17232
----
commit af81cee9f54abc13d7d07a12e4b499e49cd0dbcb
Author: Xiao Li <[email protected]>
Date: 2017-03-10T03:35:38Z
fix
----
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