MaxGekk opened a new pull request #29323:
URL: https://github.com/apache/spark/pull/29323


   ### What changes were proposed in this pull request?
   Replace `Jdbc` by `JDBC` in classes and files. I leaved as is `JdbcRDD` and 
`JdbcDialects` because they are a part of semi-public APIs.
   
   ### Why are the changes needed?
   To eliminate inconsistency in naming JDBC files and classes. There are 7 
files with the `Jdbc` prefix:
   ```
   $  apache-spark git:(master) find . -name "Jdbc*.scala" -type f
   ./core/src/test/scala/org/apache/spark/rdd/JdbcRDDSuite.scala
   ./core/src/main/scala/org/apache/spark/rdd/JdbcRDD.scala
   
./sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtilsSuite.scala
   ./sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala
   
./sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcRelationProvider.scala
   
./sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
   
./sql/hive-thriftserver/src/test/scala/org/apache/spark/sql/hive/thriftserver/JdbcConnectionUriSuite.scala
   ```
   and 8 files start from the `JDBC`:
   ```
   $  apache-spark git:(master) find . -name "JDBC*.scala" -type f
   ./sql/core/src/test/scala/org/apache/spark/sql/jdbc/JDBCSuite.scala
   ./sql/core/src/test/scala/org/apache/spark/sql/jdbc/JDBCWriteSuite.scala
   
./sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/v2/jdbc/JDBCTableCatalogSuite.scala
   
./sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRDD.scala
   
./sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCOptions.scala
   
./sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRelation.scala
   
./sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/jdbc/JDBCTableCatalog.scala
   
./sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/jdbc/JDBCTable.scala
   ```
   
   ### Does this PR introduce _any_ user-facing change?
   Should not.
   
   ### How was this patch tested?
   By existing test suites like `JDBCSuite`.


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