GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/18365
[SPARK-21147][SS] Throws an analysis exception when a user-specified schema
is given in socket source
## What changes were proposed in this pull request?
This PR proposes to throw an exception if a schema is provided by user to
socket source as below:
```scala
import org.apache.spark.sql.types._
val userSpecifiedSchema = StructType(
StructField("name", StringType) ::
StructField("area", StringType) :: Nil)
val df = spark.readStream.format("socket").option("host",
"localhost").option("port", 9999).schema(userSpecifiedSchema).load
df.printSchema
```
**Before**
```
root
|-- value: string (nullable = true)
```
**After**
```
org.apache.spark.sql.AnalysisException: The socket source does not support
a user-specified schema.;
at
org.apache.spark.sql.execution.streaming.TextSocketSourceProvider.sourceSchema(socket.scala:199)
at
org.apache.spark.sql.execution.datasources.DataSource.sourceSchema(DataSource.scala:192)
at
org.apache.spark.sql.execution.datasources.DataSource.sourceInfo$lzycompute(DataSource.scala:87)
at
org.apache.spark.sql.execution.datasources.DataSource.sourceInfo(DataSource.scala:87)
at
org.apache.spark.sql.execution.streaming.StreamingRelation$.apply(StreamingRelation.scala:30)
at
org.apache.spark.sql.streaming.DataStreamReader.load(DataStreamReader.scala:150)
... 50 elided
```
## How was this patch tested?
Unit test in `TextSocketStreamSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-21147
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18365.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 #18365
----
commit 92d07c0e0179a819ddacc63d3841fb7821fef1e0
Author: hyukjinkwon <[email protected]>
Date: 2017-06-20T16:02:20Z
Throws an analysis exception when a user-specified schema is given in
socket source
----
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