The compressed in-memory file systems (memLZF:) could not be used in the MVStore.

h2/src/main/org/h2/store/fs/FilePathMem.java

@@ -202,7 +202,7 @@ public class FilePathMem extends FilePath {
         return name.equals(getScheme() + ":");
     }
 
-    private static String getCanonicalPath(String fileName) {
+    protected static String getCanonicalPath(String fileName) {
         fileName = fileName.replace('\\', '/');
         int idx = fileName.indexOf(':') + 1;
         if (fileName.length() > idx && fileName.charAt(idx) != '/') {
@@ -232,6 +232,13 @@ public class FilePathMem extends FilePath {
  */
 class FilePathMemLZF extends FilePathMem {
 
+    @Override
+    public FilePathMem getPath(String path) {
+        FilePathMemLZF p = new FilePathMemLZF();
+        p.name = getCanonicalPath(path);
+        return p;
+    }
+
     @Override
     boolean compressed() {
         return true;

h2/src/test/org/h2/test/unit/TestFileSystem.java

@@ -393,6 +393,7 @@ public class TestFileSystem extends TestBase {
     }
 
     private void testFileSystem(String fsBase) throws Exception {
+        testRootExists(fsBase);
         testPositionedReadWrite(fsBase);
         testSetReadOnly(fsBase);
         testParentEventuallyReturnsNull(fsBase);
@@ -401,6 +402,15 @@ public class TestFileSystem extends TestBase {
         testRandomAccess(fsBase);
     }
 
+    private void testRootExists(String fsBase) {
+        String fileName = fsBase + "/testFile";
+        FilePath p = FilePath.get(fileName);
+        while (p.getParent() != null) {
+            p = p.getParent();
+        }
+        assertTrue(p.exists());
+    }
+
     private void testSetReadOnly(String fsBase) {
         String fileName = fsBase + "/testFile";
         if (FileUtils.exists(fileName)) {