Use statistics for joins

Optimize join selectivity estimation using collected underlying tables statistics. Mostly, it's about equals conditions on join: for common cases when tbl1.col1 = tbl2.col2 presented and statistics available for both columns - optimizer can use additional conditions like (col1.maxValue >= col2.minValue and col1.minValue <= col2.maxValue).

For example: col1 contains numbers from 1 to 10 while col2 contains numbers from 1 to 100. So we can expect that only 10% of rows in tbl2 were selected.

It's all just a hypothetical option to dig in.