ColumnNamer - remove redundant session field

h2/src/main/org/h2/util/ColumnNamer.java

@@ -18,14 +18,12 @@ public class ColumnNamer {
     private static final String DEFAULT_COLUMN_NAME = "DEFAULT";
 
     private final ColumnNamerConfiguration configuration;
-    private final Session session;
     private final Set<String> existingColumnNames = new HashSet<>();
 
     public ColumnNamer(Session session) {
-        this.session = session;
-        if (this.session != null && this.session.getColumnNamerConfiguration() != null) {
+        if (session != null && session.getColumnNamerConfiguration() != null) {
             // use original from session
-            this.configuration = this.session.getColumnNamerConfiguration();
+            this.configuration = session.getColumnNamerConfiguration();
         } else {
             // detached namer, create new
             this.configuration = ColumnNamerConfiguration.getDefault();