ajantha-bhat commented on code in PR #7105: URL: https://github.com/apache/iceberg/pull/7105#discussion_r1320009356
########## format/spec.md: ########## @@ -702,6 +703,49 @@ Blob metadata is a struct with the following fields: | _optional_ | _optional_ | **`properties`** | `map<string, string>` | Additional properties associated with the statistic. Subset of Blob properties in the Puffin file. | +#### Partition statistics + +Partition statistics files are based on [Partition Statistics file spec](#partition-statistics-file). +Partition statistics are not required for reading or planning and readers may ignore them. +Each table snapshot may be associated with at most one partition statistic file. +A writer can optionally write the partition statistics file during each write operation. If the statistics file is written for the specific snapshot, +it must be registered in the table metadata file to be considered as a valid statistics file for the reader. + +Partition statistics files metadata within `partition-statistics` table metadata field is a struct with the following fields: + +| v1 | v2 | Field name | Type | Description | +|----|----|------------|------|-------------| +| _required_ | _required_ | **`snapshot-id`** | `long` | ID of the Iceberg table's snapshot the partition statistics file is associated with. | +| _required_ | _required_ | **`statistics-file-path`** | `string` | Path of the partition statistics file. See [Partition Statistics file](#partition-statistics-file). | +| _required_ | _required_ | **`max-data-sequence-number`** | `long` | Maximum data sequence number of the Iceberg table's snapshot the partition statistics was computed from. | + +#### Partition Statistics file + +Statistics information for each unique partition tuple is stored as a row in the default data file format of the table (for example, Parquet or ORC). +These rows are sorted (in ascending manner with NULL FIRST) based on all partition columns from `partition` in the same order Review Comment: Done. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
