Referential Constraints for Datetime Types

[dluftspring]

Required Functionality
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As a user generating data I would like to be able to impose inequality constraints between two datetime fields for the same record in a JSON array.

For example

"created_at": {
  "type": "date_time"
},

"last_login": {
   "type": "date_time"
   "begin": min(<collection>.created_at) 
}

Proposed Solution
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Use case
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