wgtmac commented on code in PR #494:
URL: https://github.com/apache/parquet-format/pull/494#discussion_r2057861580


##########
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 geospatial values](#invalid-geospatial-values).
+
+* X and Y: Skip any invalid X or Y value and continue processing the remaining 
X or Y 
+  values. Do not produce a bounding box if all X or all Y values are invalid.

Review Comment:
   What should we do if a geometry feature has a NaN value in its X coordinate? 
Should we ignore all the X/Y/Z/M coordinates from it, or just ignore that 
specific NaN value? It seems reasonable to do the latter.



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