nevi-me commented on a change in pull request #491:
URL: https://github.com/apache/arrow-rs/pull/491#discussion_r679469823
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File path: parquet/src/arrow/levels.rs
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@@ -234,13 +234,53 @@ impl LevelInfo {
LevelType::Primitive(list_field.is_nullable()),
)]
}
- DataType::List(_) | DataType::LargeList(_) |
DataType::Struct(_) => {
+ DataType::List(_)
+ | DataType::LargeList(_)
+ | DataType::Struct(_)
+ | DataType::Map(_, _) => {
list_level.calculate_array_levels(&child_array,
list_field)
}
DataType::FixedSizeList(_, _) => unimplemented!(),
DataType::Union(_) => unimplemented!(),
}
}
+ DataType::Map(map_field, _) => {
+ // Calculate the map level
+ let map_level = self.calculate_child_levels(
+ array_offsets,
+ array_mask,
+ // A map is treated like a list as it has repetition
+ LevelType::List(field.is_nullable()),
+ );
+
+ let map_array =
array.as_any().downcast_ref::<MapArray>().unwrap();
+
+ let key_array = map_array.keys();
+ let value_array = map_array.values();
+
+ if let DataType::Struct(fields) = map_field.data_type() {
+ let key_field = &fields[0];
+ let value_field = &fields[1];
+
+ let mut map_levels = vec![];
+
+ // Get key levels
+ let mut key_levels =
+ map_level.calculate_array_levels(&key_array,
key_field);
+ map_levels.append(&mut key_levels);
+
+ let mut value_levels =
+ map_level.calculate_array_levels(&value_array,
value_field);
+ map_levels.append(&mut value_levels);
+
+ map_levels
+ } else {
+ panic!(
+ "Map field should be a struct, found {:?}",
+ map_field.data_type()
+ );
+ }
+ }
DataType::FixedSizeList(_, _) => unimplemented!(),
Review comment:
Done
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