RussellSpitzer commented on code in PR #17822: URL: https://github.com/apache/iceberg/pull/17822#discussion_r4136341880
########## format/spec.md: ########## @@ -654,6 +655,127 @@ Sorting floating-point numbers should produce the following behavior: `-NaN` < ` A data or delete file is associated with a sort order by the sort order's id within [a manifest](#manifests). Therefore, the table must declare all the sort orders for lookup. A table could also be configured with a default sort order id, indicating how the new data should be sorted by default. Writers should use this default sort order to sort the data on write, but are not required to if the default order is prohibitively expensive, as it would be for streaming writes. +### Constraints + +Constraints are added in v4 and are not supported in v3 or earlier. + +A **constraint** declares a property that a table's rows are expected to satisfy. A constraint's definition is stored in table metadata. Whether a constraint holds is recorded for each snapshot, see [Constraint Validation](#constraint-validation). + +Iceberg does not evaluate constraints. Enforcement and validation are performed by engines that write to a table. Iceberg stores constraint definitions and records the status that a writer reports for a commit without verifying it. Review Comment: I'd drop the "Iceberg does not evaluate constraints" since i'm not sure what this means. I'd probably drop this whole paragraph. -- 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]
