lamber-ken edited a comment on issue #1093: [MINOR] replace scala map add operator URL: https://github.com/apache/incubator-hudi/pull/1093#issuecomment-564251346 From scala api, we can learn about `++:`, we may are more familiar with `++`. From my side, it's better replace `++:` with `++`. 😃 It's better to unify the operator in one project, `IncrementalRelation#buildScan` use `++=`. https://www.scala-lang.org/api/2.11.0/index.html#scala.collection.immutable.List
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