#pragma once

#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesNumber.h>
#include "FunctionArrayMapped.h"


namespace DB
{

/** arrayExists(x1,...,xn -> expression, array1,...,arrayn) - is the expression true for at least one array element.
  * An overload of the form f(array) is available, which works in the same way as f(x -> x, array).
  */
struct ArrayExistsImpl
{
    static bool needBoolean() { return true; }
    static bool needExpression() { return false; }
    static bool needOneArray() { return false; }

    static DataTypePtr getReturnType(const DataTypePtr & /*expression_return*/, const DataTypePtr & /*array_element*/)
    {
        return std::make_shared<DataTypeUInt8>();
    }

    static ColumnPtr execute(const ColumnArray & array, ColumnPtr mapped);
};

struct NameArrayExists { static constexpr auto name = "arrayExists"; };
using FunctionArrayExists = FunctionArrayMapped<ArrayExistsImpl, NameArrayExists>;

}