找不到所请求操作的编解码器：[frozen <ynapanalyticsteam.ynapnestedmap>＆lt; - ＆gt; java.util.Map <java.lang.string，java.lang.string =“”>]

Question

我正在使用Java Driver从事Cassandra的数据检索工作。

我有自定义数据类型

CREATE TYPE ynapanalyticsteam.ynapnestedmap (
so_nestedmap map<text, text>

）;

列类型映射如下

order_line map<text, frozen<ynapnestedmap>>

我正在尝试使用TypeToken检索此列的值，如下所示。

row.getMap("order_line", TypeToken.of(String.class), new TypeToken<Map<String,String>>() {});

但我仍然得到codecNot发现异常。

Answer 1

You need to define codec for your nested user-defined type, not for date_beg = datetime(2016,01,01); date_end = datetime(2017,09,15); figure(); xlim([datenum(date_beg) datenum(date_end)]); datetick('x','dd-mm-yyyy','keeplimits'); - they are different types...

The documentation for java driver has good description of this process.

The code that you trying to use will work for definition of column like:

void redundantcode_2_with_no_param() {…}