Method: Polars::Expr#append

Defined in:
lib/polars/expr.rb

#append(other, upcast: true) ⇒ Expr

Append expressions.

This is done by adding the chunks of other to this Series.

Examples:

df = Polars::DataFrame.new(
  {
    "a" => [8, 9, 10],
    "b" => [nil, 4, 4]
  }
)
df.select(Polars.all.head(1).append(Polars.all.tail(1)))
# =>
# shape: (2, 2)
# ┌─────┬──────┐
# │ a   ┆ b    │
# │ --- ┆ ---  │
# │ i64 ┆ i64  │
# ╞═════╪══════╡
# │ 8   ┆ null │
# │ 10  ┆ 4    │
# └─────┴──────┘

Parameters:

  • other (Expr) —

    Expression to append.

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

    Cast both Series to the same supertype.

Returns:



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# File 'lib/polars/expr.rb', line 850

def append(other, upcast: true)
  other = Utils.parse_into_expression(other)
  wrap_expr(_rbexpr.append(other, upcast))
end