Dandandan commented on pull request #982:
URL: https://github.com/apache/arrow-datafusion/pull/982#issuecomment-914957434


   Nice idea @houqp !
   
   Some thoughts:
   
   One concern I have with using it for a library is that users of `datafusion` 
(as a library) will still update dependencies, and any build errors (with 
newer, failing dependencies) are not caught by having a fixed lock file 
(whereas we mostly get those errors in CI now in PRs if the build breaks based 
on incompatible dependencies).
   
   Next to that, do we have any users actually using the source release (e.g. 
with included Cargo.lock file), instead of only using `datafusion` in the 
Cargo.toml file?
   
   On the other hand, it still might have benefit if someone wants to do an 
(automated) build for distributing the binaries. But I am not sure if currently 
that's done somewhere?
   
   Also, before we go ahead with this, I think it makes sense to have a plan / 
document how to update the cargo lock file.
   
   Some options I can think of:
   
   * Manual/automated frequent update (e.g. weekly / bi-weekly)
   * Update on need
   * Automated, like dependabot (with a lot of dependencies, can cause quite 
some PR noise)


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