Improve Record#get(String key) complexity to O(1) #696
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The previous impl gives O(n) complexity because of index lookup in keys list. As the API of two Record#get methods are so similar, it is a valid assumption that the performance of two methods shall be the same.
This PR introduces a lookup map to use one extra small space to improve
Record#get(String key)
complexity from O(n) to O(1).