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dinkar's avatar
dinkar
New Contributor
2 years ago

Need all the columns pipeline using expression in mapper snap.

when we use $.keys() below 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.

 

3 Replies

  • SpiroTaleski's avatar
    SpiroTaleski
    Valued Contributor
    2 years ago
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    dinkar 

    Instead of going for all the rows, using the Head snap you will be able to get only first row and then get all the columns using keys() function.

  • SpiroTaleski's avatar
    SpiroTaleski
    Valued Contributor
    2 years ago
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    dinkar 

    Check the Head Snap, you will be able to limit to a first row from the input stream, and then to get columns from that first row using the same function($.keys())