Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16971#discussion_r103844007
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/QuantileSummaries.scala
---
@@ -176,17 +176,21 @@ class QuantileSummaries(
* @param quantile the target quantile
* @return
*/
- def query(quantile: Double): Double = {
+ def query(quantile: Double): Option[Double] = {
require(quantile >= 0 && quantile <= 1.0, "quantile should be in the
range [0.0, 1.0]")
require(headSampled.isEmpty,
"Cannot operate on an uncompressed summary, call compress() first")
+ if (sampled.isEmpty) {
+ return None
+ }
--- End diff --
Nit:
```
if (sampled.isEmpty) return None
```
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