flyrain commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1724083771
##########
format/spec.md:
##########
@@ -323,16 +327,17 @@ Partition field IDs must be reused if an existing
partition spec contains an equ
#### Partition Transforms
-| Transform name | Description
| Source types
| Result type |
-|-------------------|--------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------|-------------|
-| **`identity`** | Source value, unmodified
| Any
| Source type |
-| **`bucket[N]`** | Hash of value, mod `N` (see below)
| `int`, `long`, `decimal`, `date`, `time`, `timestamp`, `timestamptz`,
`timestamp_ns`, `timestamptz_ns`, `string`, `uuid`, `fixed`, `binary` | `int`
|
-| **`truncate[W]`** | Value truncated to width `W` (see below)
| `int`, `long`, `decimal`, `string`, `binary`
| Source type |
-| **`year`** | Extract a date or timestamp year, as years from 1970
| `date`, `timestamp`, `timestamptz`, `timestamp_ns`, `timestamptz_ns`
| `int` |
-| **`month`** | Extract a date or timestamp month, as months from
1970-01-01 | `date`, `timestamp`, `timestamptz`, `timestamp_ns`,
`timestamptz_ns` | `int` |
-| **`day`** | Extract a date or timestamp day, as days from 1970-01-01
| `date`, `timestamp`, `timestamptz`, `timestamp_ns`, `timestamptz_ns`
| `int` |
-| **`hour`** | Extract a timestamp hour, as hours from 1970-01-01
00:00:00 | `timestamp`, `timestamptz`, `timestamp_ns`, `timestamptz_ns`
| `int` |
-| **`void`** | Always produces `null`
| Any
| Source type or `int` |
+| Transform name | Description
| Source types
| Result type
|
+|-------------------|--------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------|----------------------|
+| **`identity`** | Source value, unmodified
| Any
| Source type
|
Review Comment:
Maybe that's fine if it is comparable, but practically people will always
use `xz2`, right? I'm not sure, but wondering if there is some implications,
e.g., too expensive, or super high cardinality, so that we don't recommend user
to use the original GEO value as the partition spec.
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