okhsunrog commented on code in PR #10927:
URL: https://github.com/apache/arrow-rs/pull/10927#discussion_r3905571534
##########
arrow-select/src/concat.rs:
##########
@@ -1708,6 +1708,124 @@ mod tests {
assert_eq!(array.logical_null_count(), 10);
}
+ #[test]
+ fn concat_string_view_dictionary_merges_duplicate_values() {
+ // Two independently-built `Dictionary<UInt8, Utf8View>` arrays
holding the
+ // same 200 distinct values. Naively concatenating their dictionaries
yields
+ // 400 entries, which overflows the u8 key range, but the distinct
values do
+ // fit -- so the values must be merged and deduplicated instead. This
mirrors
+ // a `Dictionary<UInt16, Utf8View>` column read in several partitions,
each
+ // building its own dictionary, and then combined.
Review Comment:
Done.
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