[GitHub] [arrow] ianmcook commented on pull request #9586: ARROW-11704: [R] Wire up dplyr::mutate() for datasets

[GitBox]

ianmcook commented on pull request #9586:
URL: https://github.com/apache/arrow/pull/9586#issuecomment-791567699


   Looks like `mutate()` on datasets errors when expressions are literals:
   ```r
   ds %>% transmute(x=42) %>% head(1)
   ## Error in dataset___ScannerBuilder__ProjectExprs(self, cols, names(cols)) 
: 
   ##  Invalid R object for std::__1::shared_ptr<arrow::dataset::Expression>, 
must be an ArrowObject
   
   ds %>% transmute(x="foo") %>% head(1)
   ## Error in dataset___ScannerBuilder__ProjectExprs(self, cols, names(cols)) 
: 
   ##  Invalid R object for std::__1::shared_ptr<arrow::dataset::Expression>, 
must be an ArrowObject
   ```


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