GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/17916
[SPARK-20590][SQL] Use Spark internal datasource if multiples are found for
the same shorten name
## What changes were proposed in this pull request?
This PR proposes a different approach for
https://github.com/apache/spark/pull/17847
## How was this patch tested?
Manually tested as below:
```bash
./bin/spark-shell --packages com.databricks:spark-csv_2.11:1.5.0
```
```scala
spark.sparkContext.setLogLevel("WARN")
```
**positive cases**:
```bash
scala> spark.range(1).write.format("csv").mode("overwrite").save("/tmp/abc")
17/05/09 16:32:56 WARN DataSource: Multiple sources found for csv
(org.apache.spark.sql.execution.datasources.csv.CSVFileFormat,
com.databricks.spark.csv.DefaultSource15), please specify the fully
qualified class name.
Using the internal datasource
(org.apache.spark.sql.execution.datasources.csv.CSVFileFormat).
```
(newlines were inserted for readability).
```scala
scala>
spark.range(1).write.format("com.databricks.spark.csv").mode("overwrite").save("/tmp/abc")
```
```scala
scala>
spark.range(1).write.format("org.apache.spark.sql.execution.datasources.csv.CSVFileFormat").mode("overwrite").save("/tmp/abc")
```
```scala
scala> spark.range(1).write.format("Csv").save("/tmp/abc1")
```
**negative cases**:
```scala
scala>
spark.range(1).write.format("com.databricks.spark.csv.CsvRelation").save("/tmp/abc")
java.lang.InstantiationException: com.databricks.spark.csv.CsvRelation
...
```
```scala
scala>
spark.range(1).write.format("com.databricks.spark.csv.CsvRelatio").save("/tmp/abc")
java.lang.ClassNotFoundException: Failed to find data source:
com.databricks.spark.csv.CsvRelatio. Please find packages at
http://spark.apache.org/third-party-projects.html
...
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark datasource-detect
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17916.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 #17916
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