Class Union

All Implemented Interfaces:
Cloneable, RelOptNode, RelNode
Direct Known Subclasses:
Bindables.BindableUnion, EnumerableUnion, JdbcRules.JdbcUnion, LogicalUnion

public abstract class Union
extends SetOp
Relational expression that returns the union of the rows of its inputs, optionally eliminating duplicates.

Corresponds to SQL UNION and UNION ALL.