invoke() to use lists when integer arrays have NAs to fix #971
invoke() to use lists when integer arrays have NAs to fix #971

rstudio/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr,kevinykuo/sparklyr