Index: src/test/java/org/apache/jackrabbit/core/query/SimpleQueryTest.java
===================================================================
--- src/test/java/org/apache/jackrabbit/core/query/SimpleQueryTest.java	(revision 562512)
+++ src/test/java/org/apache/jackrabbit/core/query/SimpleQueryTest.java	(working copy)
@@ -343,7 +343,9 @@
         foo.setProperty("mytext", "the quick brown fox jumps over the lazy dog.");
         Node bar = testRootNode.addNode("bar");
         bar.setProperty("text", "the quick brown fox jumps over the lazy dog.");
-
+        // documents which field name is not exactly "mytext" should not match
+        bar.setProperty("mytextwhichstartswithmytext", "the quick brown fox jumps over the lazy dog.");
+        
         testRootNode.save();
 
         String sql = "SELECT * FROM nt:unstructured WHERE mytext is not null";
Index: src/main/java/org/apache/jackrabbit/core/query/lucene/MatchAllScorer.java
===================================================================
--- src/main/java/org/apache/jackrabbit/core/query/lucene/MatchAllScorer.java	(revision 562512)
+++ src/main/java/org/apache/jackrabbit/core/query/lucene/MatchAllScorer.java	(working copy)
@@ -153,13 +153,13 @@
         // otherwise calculate new
         docFilter = new BitSet(reader.maxDoc());
         // we match all terms
-        TermEnum terms = reader.terms(new Term(FieldNames.PROPERTIES, field));
+        TermEnum terms = reader.terms(new Term(FieldNames.PROPERTIES, FieldNames.createNamedValue(field, "")));
         try {
             TermDocs docs = reader.termDocs();
             try {
                 while (terms.term() != null
                         && terms.term().field() == FieldNames.PROPERTIES
-                        && terms.term().text().startsWith(field)) {
+                        && terms.term().text().startsWith(FieldNames.createNamedValue(field, ""))) {
                     docs.seek(terms);
                     while (docs.next()) {
                         docFilter.set(docs.doc());