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## What changes were proposed in this pull request? 1. `sampled` doesn't need to be `ArrayBuffer`, we never update it, but assign new value 2. `count` doesn't need to be `var`, we never mutate it. 3. `headSampled` doesn't need to be in constructor, we never pass a non-empty `headSampled` to constructor ## How was this patch tested? existing tests. Author: Wenchen Fan <wenchen@databricks.com> Closes #14603 from cloud-fan/simply. |
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