bzr commit into mysql-5.1-telco-7.0 branch (ole.john.aske:4124) Bug#58791

[Ole John Aske]

#At file:///net/fimafeng09/export/home/tmp/oleja/mysql/mysql-5.1-telco-7.0/ based on revid:jonas@stripped

 4124 Ole John Aske	2011-01-17
      Updated fix for Bug#58791 'Incorrect result as Cluster may fail to reject an unpushable condition'
      
      ha_ndbcluster::cond_push() should reject to push any condition 
      which refer fields outside the scope of 'this' table.
      
      The rejection of pushing should be signaled by returning the 
      remaining unpushed condition - or entire 'cond' if nothing was
      pushed.
      
      Also fixes two existing bugs in ha_ndbcluster::cond_push where
      we should return 'cond' instead of 'NULL' to signal that 
      the condition was unpushable (Due to memory alloc failure.)
     @ sql/ha_ndbcluster_cond.cc
        Fixed a bug in rejecting pushing of 'cond'. When a condition
        is rejected, the unpushable part of the condition should be returned.

    modified:
      mysql-test/suite/ndb/r/ndb_condition_pushdown.result
      mysql-test/suite/ndb/t/ndb_condition_pushdown.test
      sql/ha_ndbcluster.cc
      sql/ha_ndbcluster_cond.cc
=== modified file 'mysql-test/suite/ndb/r/ndb_condition_pushdown.result'
--- a/mysql-test/suite/ndb/r/ndb_condition_pushdown.result	2011-01-14 15:08:09 +0000
+++ b/mysql-test/suite/ndb/r/ndb_condition_pushdown.result	2011-01-17 13:29:52 +0000
@@ -2279,5 +2279,18 @@ select * from t where exists
 pk	i
 1	3
 drop table t,subq;
+create table t (pk1 int, pk2 int, primary key(pk1,pk2)) engine = ndb;
+insert into t values (1,0), (2,0), (3,0), (4,0);
+set engine_condition_pushdown=1;
+select table1.pk1, table2.pk1, table1.pk2, table2.pk2
+from t as table1, t as table2
+where table2.pk1 in (0,3) and
+(table1.pk1 = 7 or table2.pk1 = 3);
+pk1	pk1	pk2	pk2
+1	3	0	0
+2	3	0	0
+3	3	0	0
+4	3	0	0
+drop table t;
 set engine_condition_pushdown = @old_ecpd;
 DROP TABLE t1,t2,t3,t4,t5;

=== modified file 'mysql-test/suite/ndb/t/ndb_condition_pushdown.test'
--- a/mysql-test/suite/ndb/t/ndb_condition_pushdown.test	2011-01-14 10:42:53 +0000
+++ b/mysql-test/suite/ndb/t/ndb_condition_pushdown.test	2011-01-17 13:29:52 +0000
@@ -2346,6 +2346,28 @@ select * from t where exists
 drop table t,subq;
 
 
+
+# Bug#58791 Incorrect result as Cluster may fail to reject an unpushable condition
+
+create table t (pk1 int, pk2 int, primary key(pk1,pk2)) engine = ndb;
+insert into t values (1,0), (2,0), (3,0), (4,0);
+
+set engine_condition_pushdown=1;
+
+# Multiple instances of same table (t as table<n>, ) confused 
+# ha_ndbcluster::cond_push() which accepted
+# '(table1.pk1 = 7 or table2.pk1 = 3)' as a pushable cond.
+# for 'table2'
+#
+
+--sorted_result
+select table1.pk1, table2.pk1, table1.pk2, table2.pk2
+ from t as table1, t as table2
+ where table2.pk1 in (0,3) and
+   (table1.pk1 = 7 or table2.pk1 = 3);
+
+drop table t;
+
 set engine_condition_pushdown = @old_ecpd;
 DROP TABLE t1,t2,t3,t4,t5;
 

=== modified file 'sql/ha_ndbcluster.cc'
--- a/sql/ha_ndbcluster.cc	2011-01-17 12:31:29 +0000
+++ b/sql/ha_ndbcluster.cc	2011-01-17 13:29:52 +0000
@@ -12785,12 +12785,24 @@ Item* 
 ha_ndbcluster::cond_push(const Item *cond) 
 { 
   DBUG_ENTER("cond_push");
+
+  if (cond->used_tables() & ~table->map)
+  {
+    /**
+     * 'cond' refers fields from other tables, or other instances 
+     * of this table, -> reject it.
+     * (Optimizer need to have a better understanding of what is 
+     *  pushable by each handler.)
+     */
+    DBUG_EXECUTE("where",print_where((Item *)cond, "Rejected cond_push", QT_ORDINARY););
+    DBUG_RETURN(cond);
+  }
   if (!m_cond) 
     m_cond= new ha_ndbcluster_cond;
   if (!m_cond)
   {
     my_errno= HA_ERR_OUT_OF_MEM;
-    DBUG_RETURN(NULL);
+    DBUG_RETURN(cond);
   }
   DBUG_EXECUTE("where",print_where((Item *)cond, m_tabname, QT_ORDINARY););
   DBUG_RETURN(m_cond->cond_push(cond, table, (NDBTAB *)m_table));

=== modified file 'sql/ha_ndbcluster_cond.cc'
--- a/sql/ha_ndbcluster_cond.cc	2011-01-14 14:15:54 +0000
+++ b/sql/ha_ndbcluster_cond.cc	2011-01-17 13:29:52 +0000
@@ -972,7 +972,7 @@ ha_ndbcluster_cond::cond_push(const Item
   if (ndb_cond == NULL)
   {
     my_errno= HA_ERR_OUT_OF_MEM;
-    DBUG_RETURN(NULL);
+    DBUG_RETURN(cond);
   }
   if (m_cond_stack)
     ndb_cond->next= m_cond_stack;


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