Description
In https://github.com/apache/spark/pull/32516 we removed the to_koalas but we'd better to keep them for backward compatibility.
Also we need to raise proper deprecated warning for to_koalas after restore them.
In https://github.com/apache/spark/pull/32516 we removed the to_koalas but we'd better to keep them for backward compatibility.
Also we need to raise proper deprecated warning for to_koalas after restore them.