mwlon opened a new pull request #24085: [SPARK-26555][SQL] make ScalaReflection subtype checking thread safe URL: https://github.com/apache/spark/pull/24085 ## What changes were proposed in this pull request? Make ScalaReflection subtype checking thread safe by adding a lock. There is a thread safety bug in the <:< operator in all versions of scala (https://github.com/scala/bug/issues/10766). ## How was this patch tested? Existing tests and a new one for the new subtype checking function.
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