mapleFU commented on code in PR #197:
URL: https://github.com/apache/parquet-format/pull/197#discussion_r1317589791
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src/main/thrift/parquet.thrift:
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@@ -191,6 +191,74 @@ enum FieldRepetitionType {
REPEATED = 2;
}
+/**
+ * A histogram of repetition and definition levels for either a page or column
+ * chunk.
+ *
+ * This is useful for:
+ * 1. Estimating the size of the data when materialized in
+ * memory
+ *
+ * 2. For filter push-down on nulls at various levels of nested
+ * structures and list lengths.
+ */
+struct RepetitionDefinitionLevelHistogram {
+ /**
+ * When present, there is expected to be one element corresponding to each
+ * repetition (i.e. size=max repetition_level+1) where each element
Review Comment:
if max-rep-level == 1, it could has rep==1 and rep==2.
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