cloud-fan commented on a change in pull request #24102: [SPARK-27171][SQL]
Support Full-Partitons scan in limit for the first time
URL: https://github.com/apache/spark/pull/24102#discussion_r266320830
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala
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@@ -344,7 +344,7 @@ abstract class SparkPlan extends QueryPlan[SparkPlan] with
Logging with Serializ
while (buf.size < n && partsScanned < totalParts) {
// The number of partitions to try in this iteration. It is ok for this
number to be
// greater than totalParts because we actually cap it at totalParts in
runJob.
- var numPartsToTry = 1L
+ var numPartsToTry =
Math.max(Math.ceil(sqlContext.conf.limitStartUpFactor * totalParts).toLong, 1L)
Review comment:
How much perf speed up you observed for your query?
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