[jira] [Reopened] (ARROW-6230) [R] Reading in Parquet files are 20x slower than reading fst files in R

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney reopened ARROW-6230:
---------------------------------

> [R] Reading in Parquet files are 20x slower than reading fst files in R
> -----------------------------------------------------------------------
>
>                 Key: ARROW-6230
>                 URL: https://issues.apache.org/jira/browse/ARROW-6230
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>    Affects Versions: 0.14.0
>         Environment: Windows 10 Pro and Ubuntu 
>            Reporter: Zhuo Jia Dai
>            Assignee: Wes McKinney
>            Priority: Major
>              Labels: parquet
>             Fix For: 0.15.0
>
>         Attachments: image-2019-08-14-10-04-56-834.png
>
>
> *Problem*
> Loading any of the data I mentioned below is 20x slower than the fst format in R.
>  
> *How to get the data*
> [https://loanperformancedata.fanniemae.com/lppub/index.html]
> Register and download any of these. I can't provide the data to you, and I think it's best you register.
>  
> !image-2019-08-14-10-04-56-834.png!
>  
> *Code*
> ```r
> path = "data/Performance_2016Q4.txt"
> library(data.table)
>  library(arrow)
> a = data.table::fread(path, header = FALSE)
> fst::write_fst(a, "data/a.fst")
> arrow::write_parquet(a, "data/a.parquet")
> rm(a); gc()
> #read in test
> system.time(a <- fst::read_fst("data/a.fst")) # 4.61 seconds
> rm(a); gc()
> read in test
> system.time(a <- arrow::read_parquet("data/a.parquet") # 99.19 seconds
> ```



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