Map Keys

Within VMap data, Map keys are the virtual column names. For example, suppose you load data from a tweet file (JSON) into a FlexTable darkdata. If one of the map keys is "user.lang", you can query directly as follows:

select "user.lang" from darkdata;

To determine what keys exist in the map data, use the Flex data and map functions to compute them. See the Flex Map Functions Reference and Flex Data Functions Reference sections.