julianhyde commented on a change in pull request #2238:
URL: https://github.com/apache/calcite/pull/2238#discussion_r520039486
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File path: core/src/main/java/org/apache/calcite/util/RangeSets.java
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@@ -128,6 +129,14 @@ private RangeSets() {}
&& !range.isEmpty();
}
+ /** Returns whether a range set is a single open interval. */
+ public static <C extends Comparable<C>> boolean isOpenInterval(RangeSet<C>
rangeSet) {
+ final Set<Range<C>> ranges = rangeSet.asRanges();
+ final Range<C> range = ranges.iterator().next();
+ return ranges.size() == 1
Review comment:
Will throw if `ranges.isEmpty()` because you iterate before you check
`size`. Add a test where this is called on an empty range set.
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