pub fn show_columns<'a>(
scx: &'a StatementContext<'a>,
_: ShowColumnsStatement<Aug>,
) -> Result<ShowColumnsSelect<'a>, PlanError>
pub fn show_columns<'a>(
scx: &'a StatementContext<'a>,
_: ShowColumnsStatement<Aug>,
) -> Result<ShowColumnsSelect<'a>, PlanError>