- Fix MDEV-10111 Reconize unsigned integers when creating tables via srcdef

  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/myconn.cpp

- Fix MDEV-10136 crash on SELECT jsonget_string(NULL, 'a')
  modified:   storage/connect/jsonudf.cpp

- Assert longjmp initialized when suballocating
  modified:   storage/connect/plugutil.c

- Avoid crash in MakeRecord when table->vcol_set isnull (trace > 1)
  modified:   storage/connect/ha_connect.cc

storage/connect/ha_connect.cc

@@ -1961,7 +1961,7 @@ int ha_connect::MakeRecord(char *buf)
   if (trace > 1)
     htrc("Maps: read=%08X write=%08X vcol=%08X defr=%08X defw=%08X\n",
             *table->read_set->bitmap, *table->write_set->bitmap,
-            *table->vcol_set->bitmap,
+            (table->vcol_set) ? *table->vcol_set->bitmap : 0,
             *table->def_read_set.bitmap, *table->def_write_set.bitmap);
 
   // Avoid asserts in field::store() for columns that are not updated
@@ -5619,7 +5619,7 @@ static int connect_assisted_discovery(handlerton *, THD* thd,
         len= crp->Length;
         dec= crp->Prec;
         flg= crp->Flag;
-        v= crp->Var;
+        v= (crp->Kdata->IsUnsigned()) ? 'U' : crp->Var;
 				tm= (crp->Kdata->IsNullable()) ? 0 : NOT_NULL_FLAG;
 
         if (!len && typ == TYPE_STRING)

storage/connect/jsonudf.cpp

@@ -1433,7 +1433,7 @@ static my_bool CheckMemory(PGLOBAL g, UDF_INIT *initid, UDF_ARGS *args, uint n,
 				char *p = args->args[0];
 
 				// Is this a file name?
-				if (!strchr("[{ \t\r\n", *p) && (len = GetFileLength(p)))
+				if (p && !strchr("[{ \t\r\n", *p) && (len = GetFileLength(p)))
 					ml += len * (M + 1);
 				else
 					ml += args->lengths[0] * M;

storage/connect/myconn.cpp

@@ -901,8 +901,12 @@ PQRYRES MYSQLC::GetResult(PGLOBAL g, bool pdb)
     if (fld->flags & NOT_NULL_FLAG)
       crp->Nulls = NULL;
     else {
-      crp->Nulls = (char*)PlugSubAlloc(g, NULL, m_Rows);
-      memset(crp->Nulls, ' ', m_Rows);
+			if (m_Rows) {
+				crp->Nulls = (char*)PlugSubAlloc(g, NULL, m_Rows);
+				memset(crp->Nulls, ' ', m_Rows);
+			} // endif m_Rows
+
+			crp->Kdata->SetNullable(true);
     } // endelse fld->flags
 
     } // endfor fld

storage/connect/plugutil.c

@@ -516,7 +516,9 @@ void *PlugSubAlloc(PGLOBAL g, void *memp, size_t size)
     if (trace)
       htrc("PlugSubAlloc: %s\n", g->Message);
 
-    longjmp(g->jumper[g->jump_level], 1);
+		/* Nothing we can do if longjmp is not initialized.	*/
+		assert(g->jump_level >= 0);
+	  longjmp(g->jumper[g->jump_level], 1);
     } /* endif size OS32 code */
 
   /*********************************************************************/