MAP_KEYS

Description

Extracts the keys from a given map into an ARRAY of the corresponding type.

Syntax

MAP_KEYS(<map>)

Parameters

• <map> MAP type, the input map content.

Return Value

Extracts the keys from a given map into an ARRAY of the corresponding type.

Examples

1. Regular parameters

   select map_keys(map()),map_keys(map(1, "100", 0.1, 2, null, null));

   +-----------------+---------------------------------------------+
   | map_keys(map()) | map_keys(map(1, "100", 0.1, 2, null, null)) |
   +-----------------+---------------------------------------------+
   | []              | [1.0, 0.1, null]                            |
   +-----------------+---------------------------------------------+
2. NULL parameters

   select map_keys(NULL);

   +----------------+
   | map_keys(NULL) |
   +----------------+
   | NULL           |
   +----------------+