import type { FunctionDefinition } from '../../definition_types';
/**
 * Accepts pairs of conditions and values. The function returns the value that
 * belongs to the first condition that evaluates to `true`. Both the conditions
 * and the returned values can be any expression, including column references.
 *
 * If the number of arguments is odd, the last argument is the default value which
 * is returned when no condition matches. If the number of arguments is even, and
 * no condition matches, the function returns `null`.
 *
 * @example
 * FROM employees
 * | EVAL type = CASE(
 *     languages <= 1, "monolingual",
 *     languages <= 2, "bilingual",
 *      "polyglot")
 * | KEEP emp_no, languages, type
 *
 * @example
 * FROM sample_data
 * | EVAL successful = CASE(
 *     STARTS_WITH(message, "Connected to"), 1,
 *     message == "Connection error", 0
 *   )
 * | STATS success_rate = AVG(successful)
 *
 * @example
 * FROM sample_data
 * | EVAL error = CASE(message LIKE "*error*", 1, 0)
 * | EVAL hour = DATE_TRUNC(1 hour, @timestamp)
 * | STATS error_rate = AVG(error) by hour
 * | SORT hour
 *
 * @example
 * FROM sample_data
 * | EVAL error_message = CASE(message LIKE "*error*", message, null)
 * | STATS distinct_error_messages = COUNT_DISTINCT(error_message)
 */
declare const definition: FunctionDefinition;
export default definition;
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