mikemccand commented on code in PR #12981:
URL: https://github.com/apache/lucene/pull/12981#discussion_r1447387657
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lucene/core/src/java/org/apache/lucene/util/fst/FSTCompiler.java:
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@@ -968,6 +975,9 @@ public FST<T> compile() throws IOException {
if (root.numArcs == 0) {
if (fst.metadata.emptyOutput == null) {
return null;
Review Comment:
Maybe add a comment that this means a completely empty FST? Accepts nothing?
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