Minor Description
Calling SparkR::dapplyCollect with R functions that return dataframes produces an error. This comes up when returning columns of binary data- ie. serialized fitted models. Also happens when functions return columns containing vectors.
The error message:
R computation failed with
Error in (function (..., deparse.level = 1, make.row.names = TRUE, stringsAsFactors = default.stringsAsFactors()) :
invalid list argument: all variables should have the same length
Reproducible example: https://github.com/clarkfitzg/phd_research/blob/master/ddR/spark/sparkR_dapplyCollect7.R
Relates to SPARK-16611
