[SPARK-15543][SQL] Rename DefaultSources to make them more self-describing

## What changes were proposed in this pull request?
This patch renames various DefaultSources to make their names more self-describing. The choice of "DefaultSource" was from the days when we did not have a good way to specify short names.

They are now named:
- LibSVMFileFormat
- CSVFileFormat
- JdbcRelationProvider
- JsonFileFormat
- ParquetFileFormat
- TextFileFormat

Backward compatibility is maintained through aliasing.

## How was this patch tested?
Updated relevant test cases too.

Author: Reynold Xin <rxin@databricks.com>

Closes #13311 from rxin/SPARK-15543.

1 files changed, 3 insertions, 1 deletions

diff --git a/project/MimaExcludes.scala b/project/MimaExcludes.scala
index 4e99a09657..08c575aaee 100644
--- a/project/MimaExcludes.scala
+++ b/project/MimaExcludes.scala
@@ -68,7 +68,9 @@ object MimaExcludes {
         // SPARK-13664 Replace HadoopFsRelation with FileFormat
         ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.ml.source.libsvm.LibSVMRelation"),
         ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.sql.sources.HadoopFsRelationProvider"),
-        ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.sql.sources.HadoopFsRelation$FileStatusCache")
+        ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.sql.sources.HadoopFsRelation$FileStatusCache"),
+        // SPARK-15543 Rename DefaultSources to make them more self-describing
+        ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.ml.source.libsvm.DefaultSource")
       ) ++ Seq(
         ProblemFilters.exclude[IncompatibleResultTypeProblem]("org.apache.spark.SparkContext.emptyRDD"),
         ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.broadcast.HttpBroadcastFactory"),