- FIX PIVOT bug MDEV-5869 caused by using fop (field option ptr) when NULL.

modified:
  storage/connect/ha_connect.cc

- Suppress the use of connect.in by adding the connect_xtrace system variable.
modified:
  storage/connect/ha_connect.cc

- Make column length, varchar, and temporal column types recognized in discovery
  when using SRCDEF,or PIVOT.
modified:
  storage/connect/ha_connect.cc
  storage/connect/myconn.cpp
  storage/connect/myutil.cpp
  storage/connect/plgdbsem.h

- Avoid (rare) crash when using DECIMAL type. (buf was too small)
modified:
  storage/connect/tabfmt.cpp
  storage/connect/tabmysql.cpp
  storage/connect/tabodbc.cpp
  storage/connect/tabpivot.cpp
  storage/connect/valblk.cpp
  storage/connect/value.cpp

- General cleaning of unused code, standardize tracing, and update version number
modified:
  storage/connect/block.h
  storage/connect/colblk.cpp
  storage/connect/connect.cc
  storage/connect/csort.h
  storage/connect/filamap.cpp
  storage/connect/filamdbf.cpp
  storage/connect/filamfix.cpp
  storage/connect/filamzip.cpp
  storage/connect/ha_connect.cc
  storage/connect/mycat.cc
  storage/connect/myconn.cpp
  storage/connect/mysql-test/connect/r/alter.result
  storage/connect/mysql-test/connect/r/xml.result
  storage/connect/myutil.cpp
  storage/connect/osutil.c
  storage/connect/plgdbsem.h
  storage/connect/plgdbutl.cpp
  storage/connect/plugutil.c
  storage/connect/reldef.cpp
  storage/connect/tabcol.cpp
  storage/connect/tabfmt.cpp
  storage/connect/tabmysql.cpp
  storage/connect/tabodbc.cpp
  storage/connect/tabpivot.cpp
  storage/connect/tabvct.cpp
  storage/connect/user_connect.cc
  storage/connect/valblk.cpp
  storage/connect/value.cpp
  storage/connect/xindex.cpp

storage/connect/filamdbf.cpp

@@ -485,16 +485,15 @@ bool DBFFAM::OpenTableFile(PGLOBAL g)
   PlugSetPath(filename, To_File, Tdbp->GetPath());
 
   if (!(Stream = PlugOpenFile(g, filename, opmode))) {
-#ifdef DEBTRACE
- htrc("%s\n", g->Message);
-#endif
+    if (trace)
+      htrc("%s\n", g->Message);
+    
     return (mode == MODE_READ && errno == ENOENT)
             ? PushWarning(g, Tdbp) : true;
     } // endif Stream
 
-#ifdef DEBTRACE
- htrc("File %s is open in mode %s\n", filename, opmode);
-#endif
+  if (trace)
+    htrc("File %s is open in mode %s\n", filename, opmode);
 
   To_Fb = dbuserp->Openlist;     // Keep track of File block
 
@@ -853,10 +852,10 @@ void DBFFAM::CloseTableFile(PGLOBAL g)
     rc = PlugCloseFile(g, To_Fb);
 
  fin:
-#ifdef DEBTRACE
- htrc("DBF CloseTableFile: closing %s mode=%d wrc=%d rc=%d\n",
-  To_File, mode, wrc, rc);
-#endif
+  if (trace)
+    htrc("DBF CloseTableFile: closing %s mode=%d wrc=%d rc=%d\n",
+         To_File, mode, wrc, rc);
+
   Stream = NULL;           // So we can know whether table is open
   } // end of CloseTableFile