I checked as try now. Even if enclose the string that contains the comma in double quotes, have separated forcibly by commas.
This handling is bad like a bug. Therefore I should be fixed a issue.
If import the CSV file, commas that was enclosed in double quotes in the data had to avoid from the CSV delimiter.
But, it does not correspond on the comma after escaped double quotes.
I checked as try now. Even if enclose the string that contains the comma in double quotes, have separated forcibly by commas. This handling is bad like a bug. Therefore I should be fixed a issue.