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Getting Column Names


I have a JSON file, which I use directory to get StreamSets to read the JSON file. Next, I used FieldFlatterner to flatten the JSON fields in it. Subsequently, I want to extract the field name and the field value to be inserted into a database.

I have no idea how can I extract the JSON field name, but I am able to extract the field value. How can I proceed to do this? I am new to StreamSets and am testing it to see if it can meet our use-case requirements.