Method: Polars::Functions#all

Defined in:
lib/polars/functions/aggregation/vertical.rb

#all(*names, ignore_nulls: true) ⇒ Expr

Either return an expression representing all columns, or evaluate a bitwise AND operation.

If no arguments are passed, this function is syntactic sugar for col("*"). Otherwise, this function is syntactic sugar for col(names).all.

Examples:

Selecting all columns.

df = Polars::DataFrame.new(
  {
    "a" => [true, false, true],
    "b" => [false, false, false]
  }
)
df.select(Polars.all.sum)
# =>
# shape: (1, 2)
# ┌─────┬─────┐
# │ a   ┆ b   │
# │ --- ┆ --- │
# │ u32 ┆ u32 │
# ╞═════╪═════╡
# │ 2   ┆ 0   │
# └─────┴─────┘

Evaluate bitwise AND for a column.

df.select(Polars.all("a"))
# =>
# shape: (1, 1)
# ┌───────┐
# │ a     │
# │ ---   │
# │ bool  │
# ╞═══════╡
# │ false │
# └───────┘

Parameters:

  • names (Array) —

    Name(s) of the columns to use in the aggregation.

  • ignore_nulls (Boolean) (defaults to: true) —

    Ignore null values (default).

Returns:



44
45
46
47
48
49
50
 
# File 'lib/polars/functions/aggregation/vertical.rb', line 44

def all(*names, ignore_nulls: true)
  if names.empty?
    return col("*")
  end

  col(*names).all(ignore_nulls: ignore_nulls)
end