- Add a new CONNECT global variable allowing to tell whether or not

a temporary file should be used for UPDATE/DELETE of file tables.
  Also use the "sorted" argument of index_init to help decide if
  sorting of positions must be done.
modified:
  storage/connect/checklvl.h
  storage/connect/connect.cc
  storage/connect/connect.h
  storage/connect/filamdbf.cpp
  storage/connect/filamfix.cpp
  storage/connect/filamfix.h
  storage/connect/filamtxt.cpp
  storage/connect/ha_connect.cc
  storage/connect/mysql-test/connect/r/part_table.result
  storage/connect/plgdbsem.h
  storage/connect/plgdbutl.cpp
  storage/connect/reldef.cpp
  storage/connect/tabdos.cpp
  storage/connect/tabdos.h
  storage/connect/tabfix.cpp
  storage/connect/tabfmt.cpp
  storage/connect/tabvct.cpp
  storage/connect/tabvct.h
  storage/connect/xindex.cpp

- Fix a bug in TDBASE::ColDB that caused some special columns not to
  be found in the column list and reallocated without their Value
  causing a crash of some queries.
modified:
  storage/connect/table.cpp

- Fix a bug causing RestoreNrec to be called before closing a table
  causing a wrong value given to Spos
modified:
  storage/connect/tabdos.cpp
  storage/connect/xindex.cpp

- Add a new CONNECT global variable connect_exact_info. Set to ON, it
  tells CONNECT to return exact record numbers on info queries. If OFF
  it just gives an estimate. In version 10.0.13 this was unconditionally
  ON and caused info queries on remote tables to be extremely long and
  was the subject of MDEV-6612.
modified:
  storage/connect/ha_connect.cc
  storage/connect/tabdos.cpp
  storage/connect/tabmysql.cpp
  storage/connect/tabodbc.cpp

storage/connect/tabmysql.cpp

@@ -68,6 +68,7 @@ void PrintResult(PGLOBAL, PSEM, PQRYRES);
 #endif   // _CONSOLE
 
 extern "C" int   trace;
+extern     bool  xinfo;
 
 // Used to check whether a MYSQL table is created on itself
 bool CheckSelf(PGLOBAL g, TABLE_SHARE *s, const char *host,
@@ -754,7 +755,7 @@ int TDBMYSQL::Cardinality(PGLOBAL g)
   if (!g)
     return (Mode == MODE_ANY && !Srcdef) ? 1 : 0;
 
-  if (Cardinal < 0 && Mode == MODE_ANY && !Srcdef) {
+  if (Cardinal < 0 && Mode == MODE_ANY && !Srcdef && xinfo) {
     // Info command, we must return the exact table row number
     char   query[96];
     MYSQLC myc;