GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/15615
[SPARK-17693] [SQL] Fixed Insert Failure To Data Source Tables when the
Schema has the Comment Field - Solution 2
### What changes were proposed in this pull request?
```SQL
CREATE TABLE tab1(col1 int COMMENT 'a', col2 int) USING parquet
INSERT INTO TABLE tab1 SELECT 1, 2
```
The insert attempt will fail if the target table has a column with
comments. The error is strange to the external users:
```
assertion failed: No plan for InsertIntoTable Relation[col1#15,col2#16]
parquet, false, false
+- Project [1 AS col1#19, 2 AS col2#20]
+- OneRowRelation$
```
This PR is to fix the above bug by checking the metadata when comparing the
schema between the table and the query. If not matched, we also copy the
metadata. This is an alternative to https://github.com/apache/spark/pull/15266
### How was this patch tested?
Added a test case
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark
insertDataSourceTableWithCommentSolution2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15615.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 #15615
----
commit 88e7743b12d5cc5fd93898b72f78fcb2fcf5feef
Author: gatorsmile <[email protected]>
Date: 2016-10-24T19:52:47Z
fix.
----
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