tustvold commented on code in PR #2500:
URL: https://github.com/apache/arrow-rs/pull/2500#discussion_r949145655
##########
parquet/src/arrow/array_reader/map_array.rs:
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@@ -43,15 +35,43 @@ impl MapArrayReader {
data_type: ArrowType,
def_level: i16,
rep_level: i16,
+ nullable: bool,
) -> Self {
- Self {
- key_reader,
- value_reader,
- data_type,
- // These are the wrong way round
https://github.com/apache/arrow-rs/issues/1699
- map_def_level: rep_level,
- map_rep_level: def_level,
- }
+ let struct_def_level = match nullable {
+ true => def_level + 2,
+ false => def_level + 1,
+ };
+ let struct_rep_level = rep_level + 1;
+
+ let element = match &data_type {
+ ArrowType::Map(element, _) => match element.data_type() {
+ ArrowType::Struct(fields) if fields.len() == 2 => {
+ // The inner map field must always non-nullable (#1697)
+ assert!(!element.is_nullable(), "map struct cannot be
nullable");
Review Comment:
As described in #1697 the encoding of DataType::Map permits greater
nullability than the type can actually contain
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