DAX Query Plan, Part 2, Operator Properties

Last time we learned that DAX Query Plans are tree structures formatted as indented text with each text line representing a single operator node in a tree. A text line begins with an operator name followed by a colon and then properties of the operator. Today we study the operator properties. You will see that for the four types of operators, ScaLogOp, RelLogOp, LookupPhyOp, and IterPhyOp, each type has a fixed set of common properties, and an individual operator may contain extra properties to provide supplemental information. We'll focus on the semantics of the common properties in this post.