Categories:

Semi-structured and Structured Data Functions (Map)

MAP_KEYS

Returns the keys in a MAP.

Syntax

MAP_KEYS( <map> )
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Arguments

map

The input map.

Returns

Returns a structured ARRAY containing the keys in the MAP. The order of the keys is undefined.

Examples

List the keys in a map:

SELECT MAP_KEYS({'a':1,'b':2,'c':3}::MAP(VARCHAR,NUMBER))
  AS map_keys;
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+----------+
| MAP_KEYS |
|----------|
| [        |
|   "a",   |
|   "b",   |
|   "c"    |
| ]        |
+----------+