map_concat function

Returns the union of all expr map expressions.

Syntax

map_concat([ expr1 [, ...] ] )

Arguments

  • exprN: A MAP expression. All exprN must share a least common type.

Returns

A MAP of the least common type of exprN.

If no argument is provided, an empty map. If there is a key collision an error is raised.

Examples

> SELECT map_concat(map(1, 'a', 2, 'b'), map(3, 'c'));
  {1 -> a, 2 -> b, 3 -> c}