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lag_udwf in datafusion::functions_window::lead_lag - Rust
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datafusion::functions_window::lead_lag

Function lag_udwf

Source 
pub fn lag_udwf() -> Arc<WindowUDF>
Expand description

Returns a WindowUDF for lag.

Returns the row value that precedes the current row by a specified offset within partition. If no such row exists, then returns the default value.