I was about to export all my analysis to CSV Writer, until I got a message, “Input table must only contain String, Int, or Doubles”. I checked my previous node and found out that Rule Engine Node does not define my column type. Instead, it shows “?”.
On the Rule Engine Node, I was trying to append to a new column and name it as “IATA (2)”.
I believe the issue starts in one of my statements in Rule Engine Node. I specify my statement to find this regular expression and set it to FALSE. I didn’t know it will change to boolean afterwards. That’s why it changes to undefined column type.
The reason why I wanted to do this way because, in the next Node (Row Filter) , I will search the word “false” and remove them from my field.