问题描述
从此JIRA票证中在Spark 2.0中隐藏UserDefinedType，似乎火花掩盖了2.0版的UDT API.
From this JIRA ticket Hide UserDefinedType in Spark 2.0, seems that spark hide the UDT API from version 2.0.
是否存在可以在2.2版中使用的替代函数或API，以便我们可以定义UserDefinedType?我希望在数据框或结构化流媒体中使用自定义类型.
Is there exists an alternative function or API we can use in version 2.2, so that we could define UserDefinedType? I wish to use a custom type in dataframe or structured streaming.
推荐答案
没有其他API，并且UDT保持私有状态( https://issues.apache.org/jira/browse/SPARK-7768 ).
There is no alternative API and UDT remains private (https://issues.apache.org/jira/browse/SPARK-7768).
通用 Encoders ( org.apache.spark.sql.Encoders.kryo 和 org.apache.spark.sql.Encoders.javaSerialization )在数据集中起类似的作用，但没有直接替代方法:
Generic Encoders (org.apache.spark.sql.Encoders.kryo and org.apache.spark.sql.Encoders.javaSerialization) serve similar purpose in Dataset, but there are not direct replacement:
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