szehon-ho commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1902285780
##########
format/spec.md:
##########
@@ -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:
OK so I changed again to this, let me know if it makes sense, thanks again
for patient review.
```
7. `geometry` and `geography`: this is a point: X, Y, Z, and M are the lower
/ upper bound of all component points of all geometries in file. For the X and
Y values only, the lower_bound's values (xmin/ymin) may be greater than the
upper_bound's value (xmax/ymax). In this X case, a geometry in the file may
match if it contains an X such that `x >= xmin` OR `x <= xmax`, and in this Y
case if `y >= ymin` OR `y <= ymax`. In geographic terminology, the concepts of
`xmin`, `xmax`, `ymin`, and `ymax` are also known as `westernmost`,
`easternmost`, `northernmost` and `southernmost`.
8. `geography` further restricts these points to the canonical ranges of
[-180 180] for X and [-90 90] for Y.
```
I prefer X, Y language as its more clear without defining other concepts,
but I do mention the north, east, south, west terminology in the note.
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