szehon-ho commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1799985651


##########
format/spec.md:
##########
@@ -1286,6 +1291,7 @@ This serialization scheme is for storing single values as 
individual binary valu
 | **`struct`**                 | Not supported                                 
                                                               |
 | **`list`**                   | Not supported                                 
                                                               |
 | **`map`**                    | Not supported                                 
                                                               |
+| **`geometry`**               | A single point, encoded as a {x, y, optional 
z, optional m} concatenation of its 8-byte IEEE 754 values, little-endian. |

Review Comment:
   Thanks @Kontinuation for the suggestion.  Added specification to use NaN for 
a coordinate if unset.



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