Refactored MDB relation names decoding in DDL code.

SH now takes all or nothing thus we need to change if conditions that rules our GBH.

Small warning fixes for GCC8.2

Disabled GBH.

utils/dataconvert/dataconvert.cpp

@@ -2353,7 +2353,8 @@ bool DataConvert::isColumnTimeValid( int64_t time )
 bool DataConvert::isColumnTimeStampValid( int64_t timeStamp )
 {
     TimeStamp dt;
-    memcpy(&dt, &timeStamp, sizeof(uint64_t));
+    void* dtp = static_cast<void*>(&dt);
+    memcpy(dtp, &timeStamp, sizeof(uint64_t));
 
     return isTimestampValid(dt.second, dt.msecond);
 }