JPA support for spatial queries and spatial data types

Various database implementations have added support for spatial awareness [1], both in data types as well as the ability to execute queries that can consider spatial comparisons (location, distances between locations, etc.) As of the JPA 2.2 spec, there is no native support for such capabilities -- should support for spatial data be considered for the next version of the JPA specification?

[1] - https://en.wikipedia.org/wiki/Spatial_database

Review the JPA 2.2 specification and the linked spatial database overview to identify the missing spatial data types and spatial-comparison query capabilities. Compare how various database implementations expose these features, then document a concrete recommendation for whether and how a future JPA version should support them.

Written by the indexing model from the issue text.