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Since this file doesn't have headers, you will need to manually name your fields.
You can click the "gear" icon (#1) to adjust this in the #2 area.
Once you have this set, you can rename the fields in area #3. Also, I noticed that F2 is getting typecasted to a number. You can change that to a string by clicking on the "#" sign.
Thanks Derrick i already did the steps 1 and 2 .
Also when i did the step 3 i can see the difference . Thanks for the guiding me.
But still trying to figure out how the data interpreter is analyzing the data is their a fixed rule like if the given column contains X record of numbers interpret it as Number else String ....