Rename and drop columns with Delta Lake column mapping.

Hi all,

Now databricks started supporting column rename and drop.

Column mapping requires the following Delta protocols:

1. Reader version 2 or above.
2. Writer version 5 or above.

Blog URL

##Available in Databricks Runtime 10.2 and above.
ALTER TABLE <table_name> RENAME COLUMN old_col_name TO new_col_name
 
##Available in Databricks Runtime 11.0 and above.
ALTER TABLE table_name DROP COLUMN col_name
ALTER TABLE table_name DROP COLUMNS (col_name_1, col_name_2, ...)