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jdbc

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xuwei-k
xuwei-k commented Jun 13, 2021
[error] -- Error: /tmp/sbt_e60b88db/src/test/scala/app/models/ProgrammersSpec.scala:41:14 
[info] [error] 41 |      created should not beNull
[info] [error]    |      ^^^^^^^^^^^^^^^^^^
[info] [error]    |postfix operator `beNull` needs to be enabled
[info] [error]    |by making the implicit value scala.language.postfixOps visible.
[info] [error]    |----
[info] [error]    |This can be 
yaooqinn
yaooqinn commented Sep 3, 2021

1. Describe the feature

In apache/spark#33904, I faced a performance issue with the topK scenario where K is very large which can be avoided by setting spark.sql.execution.topKSortFallbackThreshold less than the K here.

For Kyuubi users who run SQL only, improper topK SQLs will hold engines for quite a long time and they don't know why.

With a proper value for

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