Module session

Structs

• SessionFrameBounds
  To implement Session Window in a similar way to Range Frame, we define a similar frame bounds structure here. It’s very like RangeFrameBounds, but with a gap instead of start & end offset.
• SessionFrameGap
  The wrapper type for ScalarImpl session gap, containing an expression to help adding the gap to a given value.
• SessionFrameGapRef 🔒