Method: Polars::Expr#unique

Defined in:
lib/polars/expr.rb

#unique(maintain_order: false) ⇒ Expr

Get unique values of this expression.

Examples:

df = Polars::DataFrame.new({"a" => [1, 1, 2]})
df.select(Polars.col("a").unique(maintain_order: true))
# =>
# shape: (2, 1)
# ┌─────┐
# │ a   │
# │ --- │
# │ i64 │
# ╞═════╡
# │ 1   │
# │ 2   │
# └─────┘

Parameters:

  • maintain_order (Boolean) (defaults to: false) —

    Maintain order of data. This requires more work.

Returns:



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# File 'lib/polars/expr.rb', line 2566

def unique(maintain_order: false)
  if maintain_order
    wrap_expr(_rbexpr.unique_stable)
  else
    wrap_expr(_rbexpr.unique)
  end
end