How can we improve Microsoft Azure Data Lake?

Support for Table.Exists Feature

Currently we have feature to create new Table in Database.
But in case of incremental deployment of U-SQL script, I don't want to lose data from existing tables that are created. Instead to have if..else statement, which will handle issue of loss of data.
Would love to have this feature, if the Table does not exist..create it, but if table exists then else block to be executed. Else block may have alter statements.

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