Loading the reference file and setting up an inner join

Procedure

Double-click tPigJoin to open its Basic settings view.
Click the [...] for the main schema to open the Schema dialog box.
Check that input schema is correctly retrieved from the preceding component. If needed, click the ->> button to copy all the columns of the input schema to the output schema.
Click the [+] button under the output panel to add new columns according to the data structure of the reference file, groupId_ref (integer) and groupName (string) in this example. Then click OK to close the dialog box.
Click the [...] for the schema lookup flow to open the Schema dialog box.
Click the [+] button under the output panel to add two columns: groupId_ref (integer) and groupName (string), and then click OK to close the dialog box.
In the Filename field, specify the full path to the reference file.
Click the [+] button under the Join key table to add a new line, and select groupId and groupId_ref respectively from the Input and Lookup lists to match data from the main input flow with data from the lookup flow based on the group ID.
From the Join Mode list, select inner-join.

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