Fix and testcase for BUG#4984

 The crash is eliminated but still it is weird/inefficent that ROR-intersection is used when performing updates in empty table.

mysql-test/r/index_merge_ror_cpk.result

@@ -97,3 +97,24 @@ pk1	pk2	key1	key2
 95	58	10	10
 95	59	10	10
 drop table t1;
+create table t1
+( 
+RUNID varchar(22), 
+SUBMITNR varchar(5), 
+ORDERNR char(1) , 
+PROGRAMM varchar(8), 
+TESTID varchar(4), 
+UCCHECK char(1), 
+ETEXT varchar(80), 
+ETEXT_TYPE char(1),
+INFO char(1), 
+SEVERITY tinyint(3), 
+TADIRFLAG char(1), 
+PRIMARY KEY  (RUNID,SUBMITNR,ORDERNR,PROGRAMM,TESTID,UCCHECK), 
+KEY `TVERM~KEY`  (PROGRAMM,TESTID,UCCHECK)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+update t1 set `ETEXT` = '', `ETEXT_TYPE`='', `INFO`='', `SEVERITY`='', `TADIRFLAG`='' 
+WHERE 
+`RUNID`= '' AND `SUBMITNR`= '' AND `ORDERNR`='' AND `PROGRAMM`='' AND 
+`TESTID`='' AND `UCCHECK`='';
+drop table t1;

mysql-test/t/index_merge_ror_cpk.test

@@ -81,4 +81,28 @@ explain select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
 select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
 
 drop table t1;
+# Testcase for BUG#4984
+create table t1
+( 
+  RUNID varchar(22), 
+  SUBMITNR varchar(5), 
+  ORDERNR char(1) , 
+  PROGRAMM varchar(8), 
+  TESTID varchar(4), 
+  UCCHECK char(1), 
+  ETEXT varchar(80), 
+  ETEXT_TYPE char(1),
+  INFO char(1), 
+  SEVERITY tinyint(3), 
+  TADIRFLAG char(1), 
+  PRIMARY KEY  (RUNID,SUBMITNR,ORDERNR,PROGRAMM,TESTID,UCCHECK), 
+  KEY `TVERM~KEY`  (PROGRAMM,TESTID,UCCHECK)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1; 
+ 
+update t1 set `ETEXT` = '', `ETEXT_TYPE`='', `INFO`='', `SEVERITY`='', `TADIRFLAG`='' 
+WHERE 
+ `RUNID`= '' AND `SUBMITNR`= '' AND `ORDERNR`='' AND `PROGRAMM`='' AND 
+ `TESTID`='' AND `UCCHECK`=''; 
+
+drop table t1;
 

sql/opt_range.cc

@@ -748,10 +748,12 @@ QUICK_RANGE_SELECT::~QUICK_RANGE_SELECT()
 {
   DBUG_ENTER("QUICK_RANGE_SELECT::~QUICK_RANGE_SELECT");
   if (!dont_free)
+  {
+    /* file is NULL for CPK scan on covering ROR-intersection */
+    if (file) 
     {
       range_end();
       file->extra(HA_EXTRA_NO_KEYREAD);
-    delete_dynamic(&ranges); /* ranges are allocated in alloc */
       if (free_file)
       {
         DBUG_PRINT("info", ("Freeing separate handler %p (free=%d)", file,
@@ -759,6 +761,8 @@ QUICK_RANGE_SELECT::~QUICK_RANGE_SELECT()
         file->reset();
         file->close();
       }
+    }
+    delete_dynamic(&ranges); /* ranges are allocated in alloc */
     free_root(&alloc,MYF(0));
   }
   DBUG_VOID_RETURN;
@@ -1666,7 +1670,8 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
             objects are not allowed so don't use ROR-intersection for
             table deletes.
           */
-          if (thd->lex->sql_command != SQLCOM_DELETE)
+          if ((thd->lex->sql_command != SQLCOM_DELETE) )//&& 
+//              (thd->lex->sql_command != SQLCOM_UPDATE))
           {
             /*
               Get best non-covering ROR-intersection plan and prepare data for
@@ -3096,6 +3101,7 @@ QUICK_SELECT_I *TRP_ROR_INTERSECT::make_quick(PARAM *param,
         delete quick_intrsect;
         DBUG_RETURN(NULL);
       }
+      quick->file= NULL; 
       quick_intrsect->cpk_quick= quick;
     }
     quick_intrsect->records= records;

sql/opt_range.h

@@ -236,6 +236,7 @@ protected:
   bool free_file;
 
 protected:
+  friend class TRP_ROR_INTERSECT;
   friend
   QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
                                                struct st_table_ref *ref);