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[SPARK-17359][SQL][MLLIB] Use ArrayBuffer.+=(A) instead of ArrayBuffe…
…r.append(A) in performance critical paths ## What changes were proposed in this pull request? We should generally use `ArrayBuffer.+=(A)` rather than `ArrayBuffer.append(A)`, because `append(A)` would involve extra boxing / unboxing. ## How was this patch tested? N/A Author: Liwei Lin <[email protected]> Closes apache#14914 from lw-lin/append_to_plus_eq_v2.
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