GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/14612
[SPARK-16803] [SQL] SaveAsTable does not work when source DataFrame is
built on a Hive Table
### What changes were proposed in this pull request?
In Spark 2.0, `SaveAsTable` does not work when source DataFrame is built on
a Hive Table, but Spark 1.6 works.
**Spark 1.6**
```Scala
scala> sql("create table sample.sample stored as SEQUENCEFILE as select 1
as key, 'abc' as value")
res2: org.apache.spark.sql.DataFrame = []
scala> val df = sql("select key, value as value from sample.sample")
df: org.apache.spark.sql.DataFrame = [key: int, value: string]
scala> df.write.mode("append").saveAsTable("sample.sample")
scala> sql("select * from sample.sample").show()
+---+-----+
|key|value|
+---+-----+
| 1| abc|
| 1| abc|
+---+-----+
```
**Spark 2.0**
```Scala
scala> df.write.mode("append").saveAsTable("sample.sample")
org.apache.spark.sql.AnalysisException: Saving data in MetastoreRelation
sample, sample
is not supported.;
```
This PR is to provide a support with by-name resolution. In 1.6, it is
by-position resolution. The previous behavior is wrong. We need to adjust the
order.
### How was this patch tested?
Test cases are added
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark saveAsTableFix2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14612.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 #14612
----
commit 1967fcbeb6c7934e825cb9c043e6aa04bb057fc1
Author: gatorsmile <[email protected]>
Date: 2016-08-11T23:04:43Z
fix.
commit 1d3d392f2c6bbd358b55f3bde12806e2979dfa01
Author: gatorsmile <[email protected]>
Date: 2016-08-11T23:08:57Z
improve the comment
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