-
Georgi Kodinov authored
Range scan in descending order for c <= <col> <= c type of ranges was ignoring the DESC flag. However some engines like InnoDB have the primary key parts as a suffix for every secondary key. When such primary key suffix is used for ordering ignoring the DESC is not valid. But we generally would like to do this because it's faster. Fixed by performing only reverse scan if the primary key is used. Removed some dead code in the process. mysql-test/r/innodb_mysql.result: Bug#37830 : test case mysql-test/t/innodb_mysql.test: Bug#37830 : test case sql/opt_range.cc: Bug#37830 : - preserve and use used_key_parts to distinguish when a primary key suffix is used - removed some dead code sql/opt_range.h: Bug#37830 : - preserve used_key_parts - dead code removed sql/sql_select.cc: Bug#37830 : Do only reverse order traversal if the primary key suffix is used.
5cf6d460