Create an empty or n-row null-filled copy of the LazyFrame

Source code

Description

Returns a n-row null-filled LazyFrame with an identical schema. n can be greater than the current number of rows in the LazyFrame.

Usage

<LazyFrame>$clear(n = 0)

Arguments

n	Number of (null-filled) rows to return in the cleared frame.

Value

A n-row null-filled LazyFrame with an identical schema

Examples

library("polars")

df = pl$LazyFrame(
  a = c(NA, 2, 3, 4),
  b = c(0.5, NA, 2.5, 13),
  c = c(TRUE, TRUE, FALSE, NA)
)

df$clear()

#> polars LazyFrame
#>  $explain(): Show the optimized query plan.
#> 
#> Naive plan:
#> DF ["a", "b", "c"]; PROJECT */3 COLUMNS; SELECTION: None

df$clear(n = 5)

#> polars LazyFrame
#>  $explain(): Show the optimized query plan.
#> 
#> Naive plan:
#> DF ["a", "b", "c"]; PROJECT */3 COLUMNS; SELECTION: None