Module lead_lag 

lead and lag window function implementations

Structs

WindowShift

window shift expression

WindowShiftEvaluator 🔒

Enums

WindowShiftKind

Statics

LAG_DOCUMENTATION 🔒

LEAD_DOCUMENTATION 🔒

NULL_FIELD 🔒

Functions

evaluate_all_with_ignore_null 🔒

get_lag_doc 🔒

get_lead_doc 🔒

lag

Create an expression to represent the lag window function

lag_udwf

Returns a WindowUDF for lag.

lead

Create an expression to represent the lead window function

lead_udwf

Returns a WindowUDF for lead.

parse_default_value 🔒

Handles type coercion and null value refinement for default value argument depending on the data type of the input expression.

parse_expr 🔒

When lead/lag is evaluated on a NULL expression we attempt to refine it by matching it with the type of the default value.

parse_expr_field 🔒

Returns the field of the default value(if provided) when the expression is NULL.

shift_with_default_value 🔒