在使用DolphinDB创建一个内存表时，执行如下代码：
appendRows = 100000000
dateRange = 2010.01.01..2018.12.30
ints = rand(100,appendRows)
symbols = take(string('A'..'Z'),appendRows)
dates = take(dateRange,appendRows)
floats = rand(float(100),appendRows)
times = 00:00:00.000 + rand(86400000,appendRows)
t = table(ints as int, symbols as symbol, dates as date, floats as float, times as time)
创建失败，返回如下错误提示：
2020.10.21 12:41:06.400: executing code ...
std::bad_alloc
请问是哪里出问题了？
