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ASF GitHub Bot commented on PARQUET-2261: ----------------------------------------- mapleFU commented on code in PR #197: URL: https://github.com/apache/parquet-format/pull/197#discussion_r1302013630 ########## src/main/thrift/parquet.thrift: ########## @@ -191,6 +191,64 @@ 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) Review Comment: ```suggestion * to each repetition (i.e. size=max repetition_level+1) ``` I'm not sure would this be better or not... > [Format] Add statistics that reflect decoded size to metadata > ------------------------------------------------------------- > > Key: PARQUET-2261 > URL: https://issues.apache.org/jira/browse/PARQUET-2261 > Project: Parquet > Issue Type: Improvement > Components: parquet-format > Reporter: Micah Kornfield > Assignee: Micah Kornfield > Priority: Major > -- This message was sent by Atlassian Jira (v8.20.10#820010)