public Object readVariant(ClickHouseColumn column) throws IOException {
        int ordNum = readByte();
        return readValue(column.getNestedColumns().get(ordNum));
    }
Reads a nested into an ArrayValue object.
@param column - column information
@return array value
@throws IOException when IO error occurs
client-v2/src/main/java/com/clickhouse/client/api/data_formats/internal/BinaryStreamReader.java