import type { FunctionDefinition } from '../../definition_types';
/**
 * Returns the geometric union of two geometries. The result is a geometry that covers all points covered by either input geometry. Both geometries must share the same coordinate reference system.
 *
 * @example
 * ROW a = TO_GEOSHAPE("POLYGON ((0 0, 2 0, 2 2, 0 2, 0 0))"),
 *     b = TO_GEOSHAPE("POLYGON ((2 0, 4 0, 4 2, 2 2, 2 0))")
 * | EVAL unioned = ST_UNION(a, b)
 * | KEEP unioned
 */
declare const definition: FunctionDefinition;
export default definition;
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