fix_null_bridge.diff

Index: src/com/hp/hpl/jena/sdb/compiler/QueryCompilerMain.java
===================================================================
--- src/com/hp/hpl/jena/sdb/compiler/QueryCompilerMain.java     (revision 8170)
+++ src/com/hp/hpl/jena/sdb/compiler/QueryCompilerMain.java     (working copy)
@@ -80,6 +80,8 @@
         // Some changes can still be made now w have the whole SQL expression.
         
         Op op3 = postProcessSQL(op2) ;
+        // Find all OpSQL nodes and put a bridge round them. ... again
+        OpWalker.walk(op3, new SqlNodesFinisher(patternIsOneSQLStatement)) ;
         
         return op3 ;
     }