OptionalplanId: bigintStaticfnGives the column an alias. {{{ // Renames colA to colB in select output. df.select($"colA".as("colB")) }}}
If the current column has metadata associated with it, this metadata will be propagated to
the new column. If this not desired, use the API as(alias: String, metadata: Metadata) with
explicit metadata.
True if the current expression is NaN.