alamb commented on pull request #984: URL: https://github.com/apache/arrow-rs/pull/984#issuecomment-989085691
> one thing i noticed is that it doesnt seem there is way to create a DictionaryArray from a vec of scalars like you can with a vec of str slices. You can create `DictionaryArrays` from `&str` using `FromIter` as shown in https://docs.rs/arrow/6.3.0/arrow/array/struct.DictionaryArray.html ``` use arrow::array::{DictionaryArray, Int8Array}; use arrow::datatypes::Int8Type; let test = vec!["a", "a", "b", "c"]; let array : DictionaryArray<Int8Type> = test.iter().map(|&x| if x == "b" {None} else {Some(x)}).collect(); assert_eq!(array.keys(), &Int8Array::from(vec![Some(0), Some(0), None, Some(1)])); ``` There isn't an equivalent syntax for other scalar types (e.g. `u32`, `u64`, etc) though we could add them -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
