Bug with large results

[Jeffrey Melloy <jmelloy at visualdistortion dot org>]

I downloaded RHDB-explain (CVS) and stumbled across a bug.

Small queries work fine, but a larger plan will fail with a null  
pointer exception.

Using PostgreSQL 7.4.5 on OS X.

Thanks,
Jeff

Error:
java.lang.NullPointerException
        at  
com.redhat.rhdb.explain.ExplainParserV73.addQual(ExplainParserV73.java: 
796)
        at  
com.redhat.rhdb.explain.ExplainParserV73.buildExplainTree(ExplainParserV 
73.java:343)
        at  
com.redhat.rhdb.explain.ExplainParserV73.explain(ExplainParserV73.java: 
187)
        at  
com.redhat.rhdb.explain.Explain$ExplainThread.run(Explain.java:298)


Query:
select * from message_v;

plan:
                                                QUERY PLAN
------------------------------------------------------------------------ 
-----------------------------------
 Hash Join  (cost=34961.26..3454046.29 rows=155607 width=164)
   Hash Cond: ("outer".sender_id = "inner".user_id)
   Join Filter: (("inner".effdate <= "outer".message_date) AND (NOT  
(subplan)))
   ->  Hash Join  (cost=34923.29..2628055.36 rows=50978 width=115)
         Hash Cond: ("outer".recipient_id = "inner".user_id)
         Join Filter: (NOT (subplan))
         ->  Merge Join  (cost=34916.77..50555.99 rows=297841 width=105)
               Merge Cond: ("outer".user_id = "inner".recipient_id)
               Join Filter: ("outer".effdate <= "inner".message_date)
               ->  Sort  (cost=46.03..47.35 rows=526 width=39)
                     Sort Key: r_disp.user_id
                     ->  Seq Scan on user_display_name r_disp   
(cost=0.00..22.26 rows=526 width=39)
               ->  Sort  (cost=34870.74..35279.24 rows=163399 width=66)
                     Sort Key: m.recipient_id
                     ->  Seq Scan on messages m  (cost=0.00..6361.99  
rows=163399 width=66)
         ->  Hash  (cost=5.81..5.81 rows=281 width=26)
               ->  Seq Scan on users r  (cost=0.00..5.81 rows=281  
width=26)
         SubPlan
           ->  Index Scan using im_display_user on user_display_name  
udn  (cost=0.00..8.64 rows=1 width=0)
                 Index Cond: (user_id = $4)
                 Filter: ((effdate > $3) AND (effdate <= $2))
   ->  Hash  (cost=36.66..36.66 rows=526 width=65)
         ->  Hash Join  (cost=6.51..36.66 rows=526 width=65)
               Hash Cond: ("outer".user_id = "inner".user_id)
               ->  Seq Scan on user_display_name s_disp   
(cost=0.00..22.26 rows=526 width=39)
               ->  Hash  (cost=5.81..5.81 rows=281 width=26)
                     ->  Seq Scan on users s  (cost=0.00..5.81 rows=281  
width=26)
   SubPlan
     ->  Index Scan using im_display_user on user_display_name udn   
(cost=0.00..8.64 rows=1 width=0)
           Index Cond: (user_id = $1)
           Filter: ((effdate > $0) AND (effdate <= $2))
(31 rows)