This operator merges the incomming tuples from each input stream. If an inorder approach is used (the default), the operator conserves the order.
Remark: This could lead to a blocking behaviour when no data is delivered via one input stream. You could use theĀ Heartbeat operator Operator for input streams with a low data rate.
none
output = UNION(left, right) |
SELECT * FROM left UNION SELECT * FROM rigtht |