[feature] Possible future optimisation to reduce searches against the Lucene Index where there is no suitable Index configuration for the named element/attribute

Author: adamretter

extensions/indexes/lucene/src/main/java/org/exist/indexing/lucene/LuceneConfig.java

@@ -55,6 +55,7 @@
 import org.exist.dom.QName;
 import org.exist.indexing.lucene.analyzers.NoDiacriticsStandardAnalyzer;
 import org.exist.storage.NodePath;
+import org.exist.storage.NodePath2;
 import org.exist.util.DatabaseConfigurationException;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
@@ -127,6 +128,31 @@ public LuceneConfig(LuceneConfig other) {
     	this.analyzers = other.analyzers;
     	this.facetsConfig = other.facetsConfig;
     }
+
+    /**
+     * Determines probabilistically if there might be a configured index
+     * for the QName. False positive matches are possible,
+     * but false negatives are not.
+     *
+     * @param qname the element/attribute to look for an index configuration for.
+     *
+     * @return true indicates that there might be a config, false indicates
+     *     that there definitely is not a config.
+     */
+    public boolean hasConfig(final QName qname) {
+        if (paths.containsKey(qname)) {
+            return true;
+        } else {
+            final NodePath2 path = new NodePath2();
+            path.addComponent(qname);
+            for (final LuceneIndexConfig config : wildcardPaths) {
+                if (config.match(path)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
 
     public boolean matches(final NodePath path) {
         LuceneIndexConfig idxConf = paths.get(path.getLastComponent());

extensions/indexes/lucene/src/test/xquery/lucene/facets.xql

@@ -950,4 +950,28 @@ function facet:query-no-default-index-bracketed-element-count-and-facets() {
     let $result := doc("/db/lucenetest/multi-lang.xml")//(div)[ft:query(., "english:*", map { "leading-wildcard": "yes" })]
     return
         count($result) || " " || ft:facets($result, "language")?en
-};
+};
+
+declare
+    %test:assertEquals(1)
+function facet:query-no-default-index-bracketed-element-one-nonexistent-element-count() {
+    let $result := doc("/db/lucenetest/multi-lang.xml")//(div|other)[ft:query(., "english:*", map { "leading-wildcard": "yes" })]
+    return
+        count($result)
+};
+
+declare
+    %test:assertEquals(1)
+function facet:query-no-default-index-bracketed-element-one-nonexistent-element-facets() {
+    let $result := doc("/db/lucenetest/multi-lang.xml")//(div|other)[ft:query(., "english:*", map { "leading-wildcard": "yes" })]
+    return
+        ft:facets($result, "language")?en
+};
+
+declare
+    %test:assertEquals("1 1")
+function facet:query-no-default-index-bracketed-element-one-nonexistent-element-count-and-facets() {
+    let $result := doc("/db/lucenetest/multi-lang.xml")//(div|other)[ft:query(., "english:*", map { "leading-wildcard": "yes" })]
+    return
+        count($result) || " " || ft:facets($result, "language")?en
+};