aokolnychyi commented on issue #686: Add transform expressions URL: https://github.com/apache/incubator-iceberg/pull/686#issuecomment-570546754 I went through the changes in this PR. Indeed, it became much cleaner. Thanks, @rdblue! A couple of follow-up questions: - `UnboundTransform` contains a TODO to avoid using toString/fromString for transforms. What is our desired way of doing this? - Transforms always assume they operate on one column, which is not necessarily the case. It seems support for transforms that have multiple source columns (e.g. multidimensional clustering) will be a major breaking change. Do we want to delay that until we have an actual need?
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