[BEAM-6652] Restrict map usage. #7814
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Maps make terrible keys, since they aren't currently guaranteed to be coded in the same order for the same set of values by the default encoder. Until the default coder handles maps consistently (that is, maps with the same key,value pair are hashed equivalently for lifting and shuffling), their use should be restricted to ensure beam computes correctly.
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R: @username).[BEAM-XXX] Fixes bug in ApproximateQuantiles, where you replaceBEAM-XXXwith the appropriate JIRA issue, if applicable. This will automatically link the pull request to the issue.Post-Commit Tests Status (on master branch)