Crate datafusion_functions_window

Source
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
  • 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

Macros§

  • 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.

Functions§