bhabegger commented on code in PR #3139:
URL: https://github.com/apache/jackrabbit-oak/pull/3139#discussion_r4073173743
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oak-lucene/src/test/java/org/apache/jackrabbit/oak/plugins/index/lucene/LuceneFunctionIndexCommonTest.java:
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@@ -86,4 +91,44 @@ public void shutdownExecutor() {
executorService.shutdown();
}
+ /**
+ * An index whose only indexed property is a function that evaluates to
+ * null for most nodes must stay "sparse": it should contain a Lucene
+ * document only for the nodes where the function is not null, not one
+ * document per node.
+ */
+ @Test
+ public void sparseIndexForIfExistsFunction() throws CommitFailedException {
Review Comment:
Did we introduce index time if also (as a side effect ?) Or only query time ?
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