fix undeclared variable in Dataset
fix undeclared variable in Dataset

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