ndb: bug#6451

1) fix so that missing blob tables don't prevent table from being
    dropped
2) decrease size of blob part if record length exceeds max length
3) add test case for table wo/ corresponding blob table
4) init scan counters when sending scan_tabreq


mysql-test/r/ndb_autodiscover.result:
  testcase for table wo/ corresponding blob tables
mysql-test/r/ndb_autodiscover2.result:
  testcase for table wo/ corresponding blob tables
mysql-test/t/ndb_autodiscover.test:
  testcase for table wo/ corresponding blob tables
mysql-test/t/ndb_autodiscover2.test:
  testcase for table wo/ corresponding blob tables
ndb/include/ndbapi/NdbDictionary.hpp:
  Add non-const get column
ndb/src/ndbapi/NdbDictionary.cpp:
  Add non-const get column
ndb/src/ndbapi/NdbDictionaryImpl.hpp:
  Allow "partially" getTable, which enables dropping of tables
     that fails to create blob tables
ndb/src/ndbapi/NdbScanOperation.cpp:
  Init counter when sending SCAN_TABREQ
sql/ha_ndbcluster.cc:
  Make sure that blob don't have to big part size

mysql-test/r/ndb_autodiscover.result

@@ -1,4 +1,4 @@
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9,t10;
 flush status;
 create table t1(
 id int not null primary key,
@@ -363,3 +363,8 @@ a int NOT NULL PRIMARY KEY,
 b int
 ) engine=ndb;
 insert t9 values(1, 2), (2,3), (3, 4), (4, 5);
+create table t10 (
+a int not null primary key,
+b blob
+) engine=ndb;
+insert into t10 values (1, 'kalle');

mysql-test/r/ndb_autodiscover2.result

@@ -8,3 +8,6 @@ show status like 'handler_discover%';
 Variable_name	Value
 Handler_discover	1
 drop table t9;
+select * from t10;
+ERROR HY000: Got error 4263 'Invalid blob attributes or invalid blob parts table' from ndbcluster
+drop table t10;

mysql-test/t/ndb_autodiscover.test

@@ -1,7 +1,7 @@
 -- source include/have_ndb.inc
 
 --disable_warnings
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9,t10;
 --enable_warnings
 
 ################################################
@@ -472,5 +472,11 @@ system rm var/master-data/test/t9.frm ;
 # MySQL Server will have been restarted because it has a 
 # ndb_autodiscover2-master.opt file.
 
+create table t10 (
+  a int not null primary key,
+  b blob
+) engine=ndb;
 
+insert into t10 values (1, 'kalle');
 
+--exec $NDB_TOOLS_DIR/ndb_drop_table -d test `$NDB_TOOLS_DIR/ndb_show_tables | grep BLOB` > /dev/null 2>&1 || true

mysql-test/t/ndb_autodiscover2.test

@@ -13,4 +13,7 @@ show status like 'handler_discover%';
 
 drop table t9;
 
+--error 1296
+select * from t10;
+drop table t10;