@chengsijin0817 Just for your information, I have implemented a physical operator for multiway unions. This way, we do not anymore need to convert logical multiway unions into a left-deep trees of binary unions on the physical plan level. This has two advantages: First, we need only one thread per multiway union. Second, the printed plans are easier to read.
closes #123
@chengsijin0817 Just for your information, I have implemented a physical operator for multiway unions. This way, we do not anymore need to convert logical multiway unions into a left-deep trees of binary unions on the physical plan level. This has two advantages: First, we need only one thread per multiway union. Second, the printed plans are easier to read.