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[SPARK-38391][SPARK-38768][SQL][FOLLOWUP] Add comments for pushLimit and pushTopN of PushDownUtils #36092

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[SPARK-38391][SPARK-38768][SQL][FOLLOWUP] Add comments for pushLimit and pushTopN of PushDownUtils #36092

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[SPARK-38391][SPARK-38768][SQL][FOLLOWUP] Add comments for pushLimit …
beliefer Apr 7, 2022
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beliefer Apr 7, 2022
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beliefer Apr 10, 2022
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12 changes: 10 additions & 2 deletions sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala
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Expand Up @@ -116,7 +116,11 @@ object PushDownUtils extends PredicateHelper {
}

/**
* Pushes down LIMIT to the data source Scan
* Pushes down LIMIT to the data source Scan.
*
* @return the tuple of Boolean. The first Boolean value represents whether to push down, and
* the second Boolean value represents whether to push down partially which means to
* keep the `Limit`.
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can we be a little more clear and say something like
...the second Boolean value represents whether to push down partially, which means Spark will keep the Limit and do it again.

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OK

*/
def pushLimit(scanBuilder: ScanBuilder, limit: Int): (Boolean, Boolean) = {
scanBuilder match {
Expand All @@ -127,7 +131,11 @@ object PushDownUtils extends PredicateHelper {
}

/**
* Pushes down top N to the data source Scan
* Pushes down top N to the data source Scan.
*
* @return the tuple of Boolean. The first Boolean value represents whether to push down, and
* the second Boolean value represents whether to push down partially which means to
* keep the `Sort` and `Limit`.
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same comment as the above

*/
def pushTopN(
scanBuilder: ScanBuilder,
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