JFinis commented on code in PR #449:
URL: https://github.com/apache/parquet-format/pull/449#discussion_r1730336950
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src/main/thrift/parquet.thrift:
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@@ -257,7 +257,14 @@ struct Statistics {
*/
1: optional binary max;
2: optional binary min;
- /** count of null value in the column */
+ /**
+ * Count of null values in the column.
+ *
+ * Writers SHOULD always write this field even if it is zero (i.e. no null
value)
+ * or the column is not nullable.
Review Comment:
Why should writers write this field if the column isn't nullable? That feels
strictly redundant and therefore a waste of memory. If a reader assumes that
their code be nulls even though the type is required, I would consider this a
bug. There wouldn't even be a way to write nulls into a required column.
(Also, if you disregard this comment, at least change the wording from `not
nullable` to `not required`, as that's the correct term w.rt. to the schema
(there is no `nullable` field in the schema, just a repetition type).)
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