jiayuasu commented on code in PR #494:
URL: https://github.com/apache/parquet-format/pull/494#discussion_r2057018511


##########
Geospatial.md:
##########
@@ -94,6 +94,36 @@ Bounding box is defined as the thrift struct below in the 
representation of
 min/max value pair of coordinates from each axis. Note that X and Y Values are
 always present. Z and M are omitted for 2D geospatial instances.
 
+Writers should follow the guidelines below when calculating bounding boxes in
+the presence of invalid values. An invalid geospatial value refers to any of 
+the following: `NaN`, `null`, `does not exist` (e.g., LINESTRING EMPTY), or 

Review Comment:
   I just created a separate section for `invalid geospatial values`. Please 
check.



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