default String quoteIdentifier(String identifier) {
        return "\"" + identifier + "\"";
    }
Quotes the identifier. This is used to put quotes around the identifier in case the column
name is a reserved keyword, or in case it contains characters that require quotes (e.g. space).
Default using double quotes {@code "} to quote.
rdb/rdb-sink/src/main/java/com/dtstack/flink/sql/sink/rdb/dialect/JDBCDialect.java