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[SPARK-19338][SQL] Add UDF names in explain
## What changes were proposed in this pull request? This pr added a variable for a UDF name in `ScalaUDF`. Then, if the variable filled, `DataFrame#explain` prints the name. ## How was this patch tested? Added a test in `UDFSuite`. Author: Takeshi YAMAMURO <linguin.m.s@gmail.com> Closes #16707 from maropu/SPARK-19338.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala 1 addition, 1 deletion...ala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ScalaUDF.scala 5 additions, 2 deletions.../org/apache/spark/sql/catalyst/expressions/ScalaUDF.scala
- sql/core/src/main/scala/org/apache/spark/sql/UDFRegistration.scala 24 additions, 24 deletions...src/main/scala/org/apache/spark/sql/UDFRegistration.scala
- sql/core/src/test/scala/org/apache/spark/sql/UDFSuite.scala 14 additions, 0 deletionssql/core/src/test/scala/org/apache/spark/sql/UDFSuite.scala
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