fix bug -- can't remove field
fix bug -- can't remove field

hortonworks/polestar,sandbox/polestar,hortonworks/polestar,zegang/polestar,vivekratnavel/polestar,hortonworks/polestar,smartpcr/polestar,dennari/hack-n-hackers-polestar,jsanch/polestar,vega/polestar,pallavkul/polestar,zegang/polestar,sandbox/polestar,vivekratnavel/polestar,dennari/hack-n-hackers-polestar,smartpcr/polestar,uwdata/polestar,uwdata/polestar,vivekratnavel/polestar,vega/polestar,jsanch/polestar,vega/polestar,zegang/polestar,pallavkul/polestar,uwdata/polestar,dennari/hack-n-hackers-polestar,sandbox/polestar,smartpcr/polestar,pallavkul/polestar,jsanch/polestar