datafusion_expr::logical_plan::builder

Function union

Source 
pub fn union(
    left_plan: LogicalPlan,
    right_plan: LogicalPlan,
) -> Result<LogicalPlan>
Expand description

Union two LogicalPlans.

Constructs the UNION plan, but does not perform type-coercion. Therefore the subtree expressions will not be properly typed until the optimizer pass.

If a properly typed UNION plan is needed, refer to TypeCoercionRewriter::coerce_union or alternatively, merge the union input schema using coerce_union_schema and apply the expression rewrite with coerce_plan_expr_for_schema.