Optimize Handler_read_rnd by removing ORDER BY clause

[soulee-dev]

Problem

We observed that the Handler_read_rnd was continually increasing whenever __get_table_information was called upon starting PyMyRepl. The reason was found to be the usage of the ORDER BY clause on a non-indexed column within the function.

Solution

Since the table entries were empty, and ORDER BY was being used on a non-indexed column, this led to an increase in the Handler_read_rnd. As a remedy, we removed the ORDER BY clause from the SQL query and instead used Python's sort() method to sort the results. Since ORDINAL_POSITION is auto-incremental, this change will return the same sorted results as the original ORDER BY clause, without the associated performance penalty.

Changes

Removed the ORDER BY clause from the SQL query within __get_table_information.
Implemented sorting using Python's sort() method based on ORDINAL_POSITION.

Benefits

Reduces the overhead associated with using the ORDER BY clause on a non-indexed column.
Mitigates the increase in Handler_read_rnd, leading to improved performance.

Fixed: #445

[julien-duponchelle]

That's great !