Map functions

The flex map functions let you extract and manipulate nested map data.

The flex map functions let you extract and manipulate nested map data.

The first argument of all flex map functions (except EMPTYMAP and MAPAGGREGATE) takes a VMap. The VMap can originate from the __raw__ column in a flex table or be returned from a map or extraction function.

All map functions (except EMPTYMAP and MAPAGGREGATE) accept either a LONG VARBINARY or a LONG VARCHAR map argument.

In the following example, the outer MAPLOOKUP function operates on the VMap data returned from the inner MAPLOOKUP function:

=> MAPLOOKUP(MAPLOOKUP(ret_map, 'batch'), 'scripts')

You can use flex map functions exclusively with:

  • Flex tables

  • Their associated _keys tables and _view views

  • Flexible complex-type columns

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