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[SPARK-27841] Improve UTF8String fromString()/toString()/numChars() performance when strings are ASCII - Spark - [issue]
...UTF8String's fromString(), toString(), and numChars() methods are performance hotspots. For strings which consist entirely of ASCII characters we can make performance optimizations which sig...    Author: Josh Rosen , 2019-11-16, 02:58
[SPARK-29419] Seq.toDS / spark.createDataset(Seq) is not thread-safe - Spark - [issue]
...The Seq.toDS and spark.createDataset(Seq) code is not thread-safe: if the caller-supplied Encoder is used in multiple threads then createDataset's usage of the encoder may lead to incorrect ...    Author: Josh Rosen , 2019-12-02, 15:14