Enum datafusion_expr::window_frame::WindowFrameUnits

pub enum WindowFrameUnits {
    Rows,
    Range,
    Groups,
}

There are three frame types: ROWS, GROUPS, and RANGE. The frame type determines how the starting and ending boundaries of the frame are measured.

Variants

Rows

The ROWS frame type means that the starting and ending boundaries for the frame are determined by counting individual rows relative to the current row.

Range

The RANGE frame type requires that the ORDER BY clause of the window have exactly one term. Call that term “X”. With the RANGE frame type, the elements of the frame are determined by computing the value of expression X for all rows in the partition and framing those rows for which the value of X is within a certain range of the value of X for the current row.

Groups

The GROUPS frame type means that the starting and ending boundaries are determine by counting “groups” relative to the current group. A “group” is a set of rows that all have equivalent values for all all terms of the window ORDER BY clause.

Trait Implementations

impl Clone for WindowFrameUnits

fn clone(&self) -> WindowFrameUnits

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WindowFrameUnits

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for WindowFrameUnits

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<WindowFrameUnits> for WindowFrameUnits

fn from(value: WindowFrameUnits) -> Self

Converts to this type from the input type.

impl Hash for WindowFrameUnits

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for WindowFrameUnits

fn eq(&self, other: &WindowFrameUnits) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for WindowFrameUnits

fn partial_cmp(&self, other: &WindowFrameUnits) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for WindowFrameUnits

impl Eq for WindowFrameUnits

impl StructuralPartialEq for WindowFrameUnits