0.2.60

What's Changed

• Enable query-alias-test for pdo-mysql by @staabm in #520
• implement if-expression inference by @staabm in #521
• implement case-expression inference by @staabm in #522
• implement sum() inference by @staabm in #524
• Cover count(*) in tests by @staabm in #525
• Cover complex ifnull(max(...)) in tests by @staabm in #526

Full Changelog: 0.2.59...0.2.60