Module datafusion_expr::window_frame

Window frame module

The frame-spec determines which output rows are read by an aggregate window function. The frame-spec consists of four parts:

• A frame type - either ROWS, RANGE or GROUPS,
• A starting frame boundary,
• An ending frame boundary,
• An EXCLUDE clause.

Structs

• WindowFrame
  The frame-spec determines which output rows are read by an aggregate window function.

Enums

• WindowFrameBound
  There are five ways to describe starting and ending frame boundaries:
• WindowFrameUnits
  There are three frame types: ROWS, GROUPS, and RANGE. The frame type determines how the starting and ending boundaries of the frame are measured.

Functions

• check_window_frame
  Checks if given window frame is valid. In particular, if the frame is RANGE with offset PRECEDING/FOLLOWING, it must have exactly one ORDER BY column.
• convert_frame_bound_to_scalar_value
• regularize_window_order_by
  Regularizes ORDER BY clause for window definition for implicit corner cases.