tustvold commented on code in PR #2012:
URL: https://github.com/apache/arrow-rs/pull/2012#discussion_r915853677


##########
parquet/src/file/page_index/index.rs:
##########
@@ -56,6 +56,7 @@ pub enum Index {
     DOUBLE(NativeIndex<f64>),
     BYTE_ARRAY(ByteArrayIndex),
     FIXED_LEN_BYTE_ARRAY(ByteArrayIndex),
+    EMPTY_ARRAY(),

Review Comment:
   Could we also get a comment as to why this is necessary. I also wonder if 
`None` might be more self-explanatory than `EMPTY_ARRAY`??



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