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Applies an aggregate function on the elements of the array and returns its result. The name of the aggregation function is passed as a string in single quotes - for example: 'max', 'sum'.


REDUCE(<function>, <array>)


Parameter Description Supported input types
<function> The name of an aggregation function in the form of a quoted string. Any aggregation function
<array> The array to aggregate. ARRAY

Return Types

Same as the element data type of the input array


	REDUCE('max', [ 1, 2, 3, 6 ]) AS levels;

Returns: 6

When using aggregation functions that take a constant as a parameter, the parameter should be specified after the function name in parentheses. This example below uses REDUCE with the APPROX_PERCENTILE function, which requires a percentile as a parameter.

	REDUCE('approx_percentile(0.3)', [ 1, 2, 3, 4, 5, 6 ]) AS levels;

Returns: 2.5