maropu commented on issue #23982: [SQL][MINOR] Reconcile the join types between data frame and sql interface URL: https://github.com/apache/spark/pull/23982#issuecomment-470365734 > Another option is to make LEFT optional for SEMI join in .g4 and add "semi" and "anti" join types from dataframe. If anything, I like the second approach because the current one disallows non-left anti that the master accepts now, but the seconds one accepts the all statements that the master accepts now.
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