Anthony Abate created ARROW-6830: ------------------------------------ Summary: Question / Feature Request- Select Subset of Columns in read_arrow Key: ARROW-6830 URL: https://issues.apache.org/jira/browse/ARROW-6830 Project: Apache Arrow Issue Type: New Feature Components: C++, R Reporter: Anthony Abate
*Note:* Not sure if this is a limitation of the R library or the underlying C++ code: I have a ~30 gig arrow file with almost 1000 columns - it has 12,000 record batches of varying row sizes 1. Is it possible at to use *read_arrow* to filter out columns? (similar to how *read_feather* has a (col_select =... ) 2. Or is it possible using *RecordBatchFileReader* to filter columns? The only thing I seem to be able to do (please confirm if this is my only option) is loop over all record batches, select a single column at a time, and construct the data I need to pull out manually. ie like the following: data_rbfr <- arrow::RecordBatchFileReader("arrowfile") FOREACH BATCH: batch <- data_rbfr$get_batch(i) col4 <- batch$column(4) col5 <- batch$column(7) -- This message was sent by Atlassian Jira (v8.3.4#803005)