问题
I want to persist to BigTable a very wide Spark Dataframe (>100'000 columns) that is sparsely populated (>99% of values are null) while keeping only non-null values (to avoid storage cost).
Is there a way to specify in Spark to ignore nulls when writing?
Thanks !
来源：https://stackoverflow.com/questions/65647574/spark-hbase-bigtable-wide-sparse-dataframe-persistence