rluvaton commented on code in PR #10121:
URL: https://github.com/apache/arrow-rs/pull/10121#discussion_r3398059800
##########
arrow-string/src/length.rs:
##########
@@ -340,6 +346,76 @@ mod tests {
length_list_helper!(i64, Int64Array, Float32Type, value, result)
}
+ fn convert_vec_to_map<K, V, KeyArray, ValueArray>(
+ input: Vec<Option<HashMap<K, Option<V>>>>,
+ ) -> MapArray
+ where
+ K: Clone,
+ V: Clone,
+ Vec<K>: Into<KeyArray>,
+ Vec<Option<V>>: Into<ValueArray>,
+ KeyArray: Array + 'static,
+ ValueArray: Array + 'static,
+ {
+ let offsets = OffsetBuffer::<i32>::from_lengths(
+ input.iter().map(|v| v.as_ref().map_or(0, |m| m.len())),
+ );
+ let nulls = NullBuffer::from_iter(input.iter().map(|v| v.is_some()));
+ let nulls = Some(nulls).filter(|b| b.null_count() > 0);
+ let keys = input
+ .iter()
+ .flatten()
+ .flat_map(|v| v.keys())
+ .cloned()
+ .collect::<Vec<K>>();
+ let values = input
+ .iter()
+ .flatten()
+ .flat_map(|v| v.values())
+ .cloned()
+ .collect::<Vec<Option<V>>>();
+
+ let keys_array = keys.into();
+ let values_array = values.into();
+
+ let entries = StructArray::new(
+ Fields::from(vec![
+ Field::new("keys", keys_array.data_type().clone(), false),
+ Field::new(
+ "values",
+ values_array.data_type().clone(),
+ values_array.is_nullable(),
+ ),
+ ]),
+ vec![Arc::new(keys_array), Arc::new(values_array)],
+ None,
+ );
+
+ MapArray::new(
+ Arc::new(Field::new("entries", entries.data_type().clone(),
false)),
+ offsets,
+ entries,
+ nulls,
+ false,
+ )
+ }
Review Comment:
Extracted the helper to:
- #10123
and replace the code to manually create the MapArray using builder
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