A question about skew join hint

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A question about skew join hint


Hi all:
  i saw skewed join hint optimization in  https://docs.azuredatabricks.net/delta/join-performance/skew-join.html.

it  is a great feature to help users to avoid the problem brought from skewed data. My question
1. which version we will have this ? i have not found the feature in the master branch by key word "+SKEW" 
2. the article is under Documentation -> Delta Lake->  Optimizations->  Optimize Join Performance -> Skew Join Optimization,
   is this feature  only in delta lake?

Best Regards
Kelly  Zhang