Crate datafusion_functions_window

Expand description

Window Function packages for DataFusion.

This crate contains a collection of various window function packages for DataFusion, implemented using the extension API.

Modules§

cume_dist: cume_dist window function implementation
expr_fn: Fluent-style API for creating Exprs
lead_lag: lead and lag window function implementations
macros: Convenience macros for defining a user-defined window function and associated expression API (fluent style).
nth_value: nth_value window function implementation
ntile: ntile window function implementation
planner: SQL planning extensions like WindowFunctionPlanner
rank: Implementation of rank, dense_rank, and percent_rank window functions, which can be evaluated at runtime during query execution.
row_number: row_number window function implementation

create_udwf_expr: Create a WindowFunction expression that exposes a fluent API which you can use to build more complex expressions.
define_udwf_and_expr: Defines a user-defined window function.
get_or_init_udwf: Lazily initializes a user-defined window function exactly once when called concurrently. Repeated calls return a reference to the same instance.