xxchan commented on code in PR #11749:
URL: https://github.com/apache/iceberg/pull/11749#discussion_r1881514203
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format/spec.md:
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@@ -454,7 +454,7 @@ Partition field IDs must be reused if an existing partition
spec contains an equ
| **`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` |
+| **`day`** | Extract a date or timestamp day, as days from 1970-01-01
| `date`, `timestamp`, `timestamptz`, `timestamp_ns`, `timestamptz_ns`
| `int` (the physical type should be an `int`,
but the the logical type should be a `date`) |
Review Comment:
TBH I also don't fully understand why we can't use `date` directly here,
since it's a primitive type.
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