paul-rogers commented on issue #1829: DRILL-7096: Develop vector for canonical Map<K,V> URL: https://github.com/apache/drill/pull/1829#issuecomment-515716535 here seems to be little documentation of the design or implementation: I find myself having to reverse engineer a design from the code. Would it be helpful for other reviewers if we included a bit of explanation? In particular, what is the structure of the new vector? The true map vector seems to have a user-defined key and value type. Does this mean keys can be integers or maps? Do the proposed map functions handle non-Varchar keys? Do they handle repeated or map keys? If not, should the implementation restrict key types? How do we handle varying value types? (I have a map with, say, {name: "Fred", balance: 123}. Would the user specify a Union? Have we fixed the many existing problems with the Union type? Or, is the true map meant to be like a Java map: Map<K,V>, and not a Python or JSON map with string keys and values of any type? A bit of documentation (a README file, a package-info file or just a Javadoc explanation in the vector class) would help answer these questions.
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