GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/18864
[SPARK-21648] [SQL] Fix confusing assert failure in JDBC source when
parallel fetching parameters are not properly provided.
### What changes were proposed in this pull request?
```SQL
CREATE TABLE mytesttable1
USING org.apache.spark.sql.jdbc
OPTIONS (
url
'jdbc:mysql://${jdbcHostname}:${jdbcPort}/${jdbcDatabase}?user=${jdbcUsername}&password=${jdbcPassword}',
dbtable 'mytesttable1',
paritionColumn 'state_id',
lowerBound '0',
upperBound '52',
numPartitions '53',
fetchSize '10000'
)
```
The above option name `paritionColumn` is wrong. That mean, users did not
provide the value for `partitionColumn`. In such case, users hit a confusing
error.
```
AssertionError: assertion failed
java.lang.AssertionError: assertion failed
at scala.Predef$.assert(Predef.scala:156)
at
org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider.createRelation(JdbcRelationProvider.scala:39)
at
org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:312)
```
### 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 jdbcPartCol
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18864.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 #18864
----
commit e4aac502d58972063a1ab25f17a1c217abe97b97
Author: gatorsmile <[email protected]>
Date: 2017-08-05T05:38:15Z
improve message.
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