agozhiy commented on issue #1829: DRILL-7096: Develop vector for canonical Map<K,V> URL: https://github.com/apache/drill/pull/1829#issuecomment-525344202 I think we have to support backward compatibility by adding an option. Users could already use the old data representation style in their queries, and now they will need to be rewritten. For example, this won't work anymore: ```select t.c.`value` from (select flatten(x.fields.map) c from x```
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