union method
Combine this Query with other using UNION set operator.
This returns a Query containing all the rows from this Query
and other with duplicate rows appearing only once.
Implementation
Query<(Expr<A>, Expr<B>, Expr<C>)> union(
Query<(Expr<A>, Expr<B>, Expr<C>)> other,
) => Query._(
_context,
_expressions,
(e) => UnionClause._(_from(_expressions.toList()), other._castAs(this)),
);