ndb - Dynamic memory for schema transaction

Replacing statically allocated memory pools (ArrayPool)
with dynamically allocated (ArenaPool) for some objects
seized and released within a schema transaction.

A new resource SCHEMA_TRANS_MEMORY with atleast 2MiB
created.

Author: zmur

storage/ndb/include/kernel/ndb_limits.h

@@ -172,7 +172,6 @@
 /*
  * Schema transactions
  */
-#define MAX_SCHEMA_TRANSACTIONS 5
 #define MAX_SCHEMA_OPERATIONS 256
 
 /*

storage/ndb/include/kernel/signaldata/SchemaTrans.hpp

@@ -44,7 +44,8 @@ struct SchemaTransBeginRef {
     BusyWithNR = 711,
     TooManySchemaTrans = 780,
     IncompatibleVersions = 763,
-    Nodefailure = 786
+    Nodefailure = 786,
+    OutOfSchemaTransMemory = 796
   };
   Uint32 senderRef;
   Uint32 transId;