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## What changes were proposed in this pull request? This is a follow-up PR of #16800 When doing SPARK-19456, we found that "" should be consider a NULL column name and should not be set. aggregationDepth should be exposed as an expert parameter. ## How was this patch tested? Existing tests. Author: wm624@hotmail.com <wm624@hotmail.com> Closes #16945 from wangmiao1981/svc. |
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