szehon-ho commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1901819194
##########
format/spec.md:
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@@ -584,8 +589,8 @@ The schema of a manifest file is a struct called
`manifest_entry` with the follo
| _optional_ | _optional_ | _optional_ | **`110 null_value_counts`** |
`map<121: int, 122: long>` |
Map from column id to number of null values in the column
|
| _optional_ | _optional_ | _optional_ | **`137 nan_value_counts`** |
`map<138: int, 139: long>` |
Map from column id to number of NaN values in the column
|
| _optional_ | _optional_ | _optional_ | **`111 distinct_counts`** |
`map<123: int, 124: long>` |
Map from column id to number of distinct values in the column; distinct counts
must be derived using values in the file by counting or using sketches, but not
using methods like merging existing distinct counts |
-| _optional_ | _optional_ | _optional_ | **`125 lower_bounds`** |
`map<126: int, 127: binary>` |
Map from column id to lower bound in the column serialized as binary [1]. Each
value must be less than or equal to all non-null, non-NaN values in the column
for the file [2] |
-| _optional_ | _optional_ | _optional_ | **`128 upper_bounds`** |
`map<129: int, 130: binary>` |
Map from column id to upper bound in the column serialized as binary [1]. Each
value must be greater than or equal to all non-null, non-Nan values in the
column for the file [2] |
+| _optional_ | _optional_ | _optional_ | **`125 lower_bounds`** |
`map<126: int, 127: binary>` |
Map from column id to lower bound in the column serialized as binary [1]. Each
value must be less than or equal to all non-null, non-NaN values in the column
for the file [2]. See [7] for`geometry` and [8] for `geography`. |
+| _optional_ | _optional_ | _optional_ | **`128 upper_bounds`** |
`map<129: int, 130: binary>` |
Map from column id to upper bound in the column serialized as binary [1]. Each
value must be greater than or equal to all non-null, non-Nan values in the
column for the file [2]. See [9] for `geometry` and [10] for `geography`. |
Review Comment:
Sorry if my understanding is not very good, but would this work for both
(point 8)? I thought its same as what we mean by having lower_bound Y
(northermost) be greater than upper_bound Y (southermmost).
```
8. `geometry` and `geography`: For the X value, the lower_bound's X value
(xmin) may be greater than the upper_bound's X value (xmax), in which case a
geometry in the file may match if it contains an X such that `x >= xmin` OR `x
<= xmax`. For the Y value, the lower_bound's Y value (ymin) may be greater
than the upper_bound's Y value (ymax), in which case a geometry in the file may
match if it contains an Y such that `y >= ymin` OR `y <= ymax`.
9. `geography` The canonical ranges for these points in the coordinate
system is [-180 180] for west-east and [-90 90] for the south-north.
```
I am travelling at the moment so may delay in response as well.
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