- 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/plgdbsem.h

@@ -512,6 +512,7 @@ typedef  struct _colres {
   int     Prec;                    /* Precision                        */
   int     Flag;                    /* Flag option value                */
   XFLD    Fld;                     /* Type of field info               */
+  char    Var;                     /* Type added information           */
   } COLRES;
 
 #if defined(WIN32) && !defined(NOEX)