afs commented on code in PR #1689:
URL: https://github.com/apache/jena/pull/1689#discussion_r1053103859
##########
jena-extras/jena-serviceenhancer/src/test/java/org/apache/jena/sparql/service/enhancer/impl/TestServiceEnhancerMisc.java:
##########
@@ -462,4 +470,55 @@ public void testNormalization01() {
int actualRowCount =
AbstractTestServiceEnhancerResultSetLimits.testWithCleanCaches(dataset,
queryStr, 1000);
Assert.assertEquals(4, actualRowCount);
}
+
+ /**
+ * Test for <a
href="https://github.com/apache/jena/issues/1688";>/issues/1688</a>.
+ * <p>
+ * This test checks that building an overall result set from a bulk request
+ * that involves contributions of cached empty result sets works as
expected.
+ * Without the fix corresponding to this issues this test fails.
+ *
+ * @implNote This test case makes use of a dataset where only a few
resources have labels.
+ * The test query caches the labels of all resources which means that most
cache entries
+ * have empty results.
+ */
+ @Test
+ public void testBulkRequestsOverCachedEmptyResultSets() {
+ String dataStr =
String.join(StandardSystemProperty.LINE_SEPARATOR.value(),
+ "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>",
+ "<urn:example:00> a rdfs:Resource .",
+ "<urn:example:01> a rdfs:Resource .",
+ "<urn:example:02> a rdfs:Resource .",
+ "<urn:example:03> a rdfs:Resource .",
+ "<urn:example:04> a rdfs:Resource ; rdfs:label '04' .",
+ "<urn:example:05> a rdfs:Resource .",
+ "<urn:example:06> a rdfs:Resource .",
+ "<urn:example:07> a rdfs:Resource .",
+ "<urn:example:08> a rdfs:Resource ; rdfs:label '08' .",
+ "<urn:example:09> a rdfs:Resource ; rdfs:label '09' .");
+
+ String queryStr =
String.join(StandardSystemProperty.LINE_SEPARATOR.value(),
+ "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>",
+ "SELECT * {",
+ " { SELECT * { ?s a rdfs:Resource } ORDER BY ?s }",
+ " SERVICE <loop:cache:bulk+5> { ?s rdfs:label ?l }",
+ "}");
+
+ Dataset ds = DatasetFactory.create();
+ RDFDataMgr.read(ds, new StringReader(dataStr), null, Lang.TURTLE);
Review Comment:
FYI:
`RDFParser.fromString(dataStr).lang(Lang.TURTLE).toDataset();`
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