Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17122#discussion_r103841503
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala ---
@@ -69,6 +69,7 @@ trait BaseLimitExec extends UnaryExecNode with
CodegenSupport {
override def doConsume(ctx: CodegenContext, input: Seq[ExprCode], row:
ExprCode): String = {
val stopEarly = ctx.freshName("stopEarly")
ctx.addMutableState("boolean", stopEarly, s"$stopEarly = false;")
+ shouldStopRequired = true // loop may break early even without append
in loop body
--- End diff --
If this `Limit` is the parent of an `Aggregate`, the final
`shouldStopRequired` is true. But actually we can skip the check.
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