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Union of two hive tables using Workflow manager

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In Ambari, there are two tables which I have already created in hive

So using Workflow manager I want to perform the following operation:

1) Reading that two hive table

2) Performing the union operation on that 2 table

3) Saving that union output in another hive table

So is it possible to do this by using Workflow manager and if yes then it will be helpful if you provide me some details on that