Ran into this in cvs tip checked out as of yesterday:

db=>  SELECT sum(CASE WHEN (upper(substr((select 'en'::varchar),1,1)) not between 'A' 
and 'Z') THEN 1  ELSE 0 END) AS n FROM tab;
ERROR:  transformExpr: does not know how to transform node 309 (internal error)

309 is T_FuncExpr. Is this a node type that should be added as described by
the comment? Appended is the patch to add it but I don't know if it should be
or not.

     * Quietly accept node types that may be presented when we are
     * called on an already-transformed tree.
     * Do any other node types need to be accepted?  For now we are
     * taking a conservative approach, and only accepting node
     * types that are demonstrably necessary to accept.

--- parse_expr.c.~1.144.~       2003-02-09 23:44:46.000000000 -0500
+++ parse_expr.c        2003-02-12 13:02:35.000000000 -0500
@@ -670,6 +670,7 @@
                case T_Param:
                case T_Aggref:
                case T_ArrayRef:
+               case T_FuncExpr:
                case T_FieldSelect:
                case T_RelabelType:
                case T_CoerceToDomain:


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