in src/main/java/com/aliyun/odps/kafka/connect/converter/CsvRecordConverter.java [129:135]
private static String trimStringQuotes(String str) {
int i = 0;
for (int len = str.length();
i < len / 2 && str.charAt(i) == '"' && str.charAt(len - i - 1) == '"'; ++i) {
}
return str.substring(i, str.length() - i);
}