pvary commented on code in PR #16391:
URL: https://github.com/apache/iceberg/pull/16391#discussion_r3265957014
##########
docs/docs/configuration.md:
##########
@@ -93,6 +93,14 @@ Iceberg tables support table properties to configure table
behavior, like the de
| write.merge.isolation-level | serializable
| Isolation level for merge commands: serializable or snapshot
|
| write.delete.granularity | partition
| Controls the granularity of generated delete files: partition or file
|
+Notes:
+
+1. Metrics modes are explained below:
+ - `none`: In this mode, `value_counts`, `null_value_counts`,
`nan_value_counts`, `lower_bounds`, and `upper_bounds` are not persisted.
+ - `counts`: In this mode, `value_counts`, `null_value_counts`, and
`nan_value_counts` are persisted.
+ - `truncate(length)`: In this mode, `value_counts`, `null_value_counts`,
`nan_value_counts`, truncated `lower_bounds`, and truncated `upper_bounds` are
persisted. Only string and binary values are truncated to the specified length.
For other types, values are written as is.
+ - `full`: In this mode, `value_counts`, `null_value_counts`,
`nan_value_counts`, full `lower_bounds`, and full `upper_bounds` are persisted.
+
Review Comment:
```suggestion
Notes:
1. Available metrics modes:
- none: No metrics are persisted
- counts: Only count metrics are persisted (value_counts,
null_value_counts, nan_value_counts).
- truncate(length): Persists counts plus truncated bounds (lower_bounds,
upper_bounds). Truncation applies only to string and binary types; all other
types are stored as-is.
- full: Persists all metrics, including full lower_bounds and
upper_bounds.
```
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