sunjincheng121 commented on issue #8087: [FLINK-12029][table] Add column operations for TableApi URL: https://github.com/apache/flink/pull/8087#issuecomment-483192643 At the beginning of the design, we refer to the operation of the R language column, using the `-` flag in R, and the Scala language is also easy to support `-`, of course, we did not consider the upcoming new Java DSL, although `columns(...)` and `-columns(...)` are very concise, but for the description of java DSL, I agree with Timo's proposal.
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