thomasmueller commented on code in PR #3139:
URL: https://github.com/apache/jackrabbit-oak/pull/3139#discussion_r4075008913
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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:
For all functions, we need to implement them both at indexing time (even the
parsing of functions, because they need to be in the index definition) as well
as query time (parsing the XPath + SQL-2, and to send the function to the
indexes).
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