Herman van Hovell

This small PR fixes java compilation for 1.6. This diff is a bit larger because atom removes all unnecessary white space. Lemme know if you have any further questions :)

### What changes were proposed in this pull request? This PR creates a shared Dataset interface. ### Why are the changes needed? TBD ### Does this PR introduce _any_ user-facing...

### What changes were proposed in this pull request? This PR creates a common base class for `SparkSession`. ### Why are the changes needed? We are creating a unified interface...

### What changes were proposed in this pull request? This PR creates an interface for DataFrameStatFunctions that is shared between Classic and Connect. ### Why are the changes needed? ###...

[SPARK-49086][CONNECT] Move ML function registration to SparkSessionExtensions

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### What changes were proposed in this pull request? This PR moves ML function registration from the SparkConnectPlanner to the internal function registry. This registration is done using the SparkSessionExtensions...

[SPARK-49711][SQL] Remove ExperimentalMethods

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### What changes were proposed in this pull request? This PR removes ExperimentalMethod from SQL. This is the first extension point we had for Spark SQL. However it is has...