carols10cents commented on a change in pull request #8402:
URL: https://github.com/apache/arrow/pull/8402#discussion_r504931448
##########
File path: rust/parquet/src/arrow/converter.rs
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@@ -253,6 +256,34 @@ impl Converter<Vec<Option<ByteArray>>, LargeBinaryArray>
for LargeBinaryArrayCon
}
}
+pub struct DictionaryArrayConverter {}
+
+impl<K: ArrowDictionaryKeyType> Converter<Vec<Option<ByteArray>>,
DictionaryArray<K>>
+ for DictionaryArrayConverter
+{
+ fn convert(&self, source: Vec<Option<ByteArray>>) ->
Result<DictionaryArray<K>> {
+ let data_size = source
+ .iter()
+ .map(|x| x.as_ref().map(|b| b.len()).unwrap_or(0))
+ .sum();
+
+ let keys_builder = PrimitiveBuilder::<K>::new(source.len());
+ let values_builder = StringBuilder::with_capacity(source.len(),
data_size);
+
+ let mut builder = StringDictionaryBuilder::new(keys_builder,
values_builder);
+ for v in source {
+ match v {
+ Some(array) => {
+ builder.append(array.as_utf8()?)?;
Review comment:
Do you mean make this one line again, like:
`Some(array) => let _ = builder.append(array.as_utf8()?)?,`
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