How to know the all column names(input columns) using expression in mapper
I want to know list of all input columns in the pipeline using expression in mapper. Please help
Forum Discussion
when we use $.keys() above image which is showing list of columns for all the records which leads to performance issue (for example we have 1 lakh records, it will check for all 1 lakh records) ... Need only first row columns... Please help with expression which gives all columns for only 1 record.
