- Re-worked the prev_record_reads() function to return the lower bound of
number of different table access scans that will be performed.
mysql-test/r/join.result:
BUG#14940: testcase
mysql-test/t/join.test:
BUG#14940: testcase
sql/sql_select.cc:
BUG#14940: Slow join order is chosen:
- Re-worked the prev_record_reads() function to return the lower bound of
number of different table access scans that will be performed.
sql/sql_select.h:
BUG#14940: Slow join order is chosen:
- Added comments in struct POSITION
- Added POSITION::ref_depend_map: bitmap of tables that the table access
method depends on.
