@Override
        @SuppressWarnings("ConstantConditions")
        public boolean containsKey(Object key) {
            if (key instanceof String) {
                return recordRef.get()[schemaRef.get().nameToIndex((String)key)] != null;
            }
            return false;
        }
Converts value in to a string representation. Does some formatting for selected data types
@return string representation of a value for specified column
client-v2/src/main/java/com/clickhouse/client/api/data_formats/internal/AbstractBinaryFormatReader.java