when joining a table to a MYSQL indexed table.
  modified:   storage/connect/myconn.cpp
  modified:   storage/connect/myconn.h
  modified:   storage/connect/tabmysql.cpp

- Add more tests to the mysql_index.test file
  modified:   storage/connect/mysql-test/connect/r/mysql_index.result
  modified:   storage/connect/mysql-test/connect/t/mysql_index.test

- Fix and error causing remote indexing to fail when for not unique index.
  Was experienced with MYSQL, ODBC and JDBC tables.
  modified:   storage/connect/connect.cc

- Fix MDEV-9966 (zero lines returned)
  modified:   storage/connect/ha_connect.cc
  modified:   storage/federatedx/ha_federatedx.cc