https://dev.mysql.com/doc/refman/8.0/en/arithmetic-functions.html

**Use case**
`a DIV b` - the same as `intDiv(a, b)`
`a MOD b` - the same as `modulo(a, b)`
{
    ASTs elements;
    auto parse_element = [&]
    {
        ASTPtr element;
        if (!elem_parser->parse(pos, element, expected))
            return false;
        elements.push_back(element);
        return true;
    };
    
    auto parse_separator = [&]
    {
        if (s_union_parser->ignore(pos, expected))
        {
            
            if (s_all_parser->check(pos, expected))
            {
                union_modes.push_back(ASTSelectWithUnionQuery::Mode::ALL);
            }
            
            else if (s_distinct_parser->check(pos, expected))
            {
                union_modes.push_back(ASTSelectWithUnionQuery::Mode::DISTINCT);
            }