dongjoon-hyun commented on a change in pull request #23334: [SPARK-26382][SQL]
prefix comparator should handle -0.0
URL: https://github.com/apache/spark/pull/23334#discussion_r242245754
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File path:
core/src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java
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@@ -69,6 +69,8 @@ public static long computePrefix(byte[] bytes) {
* details see http://stereopsis.com/radix.html.
*/
public static long computePrefix(double value) {
+ // normalize -0.0 to 0.0, as they should be equal
+ value = value == -0.0 ? 0.0 : value;
Review comment:
Technically, `value == -0.0` is `true` for both `0.0` and `-0.0`, but the
current one is the simplest one for this normalization. We don't need to
exclude `0.0` here. +1 for the logic.
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