Github user thunterdb commented on a diff in the pull request:
https://github.com/apache/spark/pull/16971#discussion_r102592174
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/stat/StatFunctions.scala
---
@@ -78,7 +80,12 @@ object StatFunctions extends Logging {
def apply(summaries: Array[QuantileSummaries], row: Row):
Array[QuantileSummaries] = {
var i = 0
while (i < summaries.length) {
- summaries(i) = summaries(i).insert(row.getDouble(i))
+ if (!row.isNullAt(i)) {
--- End diff --
Thank you for fixing this issue, it was an oversight in my original
implementation.
The current exception being thrown depends on an implementation detail
(calling `sampled.head`). Can you modify the function `def query` below to
explicitly throw an exception if `sampled` is empty, and document this behavior
in that function? This way, we will not forget it if decide to change the
semantics of that class.
As @MLnick was mentioning above, it would be preferrable to either return
an Option, null or NaN eventually, but this can wait for more consensus.
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