MAPVALUES

Returns a string representation of the top-level values from a VMap. This transform function requires an over() clause.

Syntax

MAPVALUES(VMap_data)

Arguments

VMap_data

The VMap from which values should be returned. The VMap can exist as:

  • The __raw__ column of a flex table
  • Data returned from a map function such as maplookup()
  • Other database content
max_value_length In a __raw__ column, specifies the maximum length of values the function can return. Values that are larger than max_value_length cause the query to fail. Defaults to the smaller of VMap column length and 65K.

Examples

The following example shows how to query a darkmountain flex table, using an over() clause (in this case, the over(PARTITION BEST) clause) with mapvalues(). 

=> SELECT * FROM (SELECT MAPVALUES(darkmountain.__raw__) OVER(PARTITION BEST) FROM darkmountain) AS a;
    values
---------------
 29029
 34.1
 Everest
 mountain
 29029
 15.4
 Mt St Helens
 volcano
 17000
 12.2
 Denali
 mountain
 14000
 22.8
 Kilimanjaro
 mountain
 50.6
 Mt Washington
 mountain
(19 rows)

Specify the Maximum Length of Values that MAPVALUES Can Return 

=> SELECT MAPVALUES(__raw__ USING PARAMETERS max_value_length=100000) OVER() FROM mapper;
    keys
-------------
 five_Map
 four
 one
 six
 three_Array
 two
(6 rows)

See Also