Hi Jim,
这是一个已知问题[1]，你可以看下这个issue，是否可以解决你的问题？
[1] https://issues.apache.org/jira/browse/FLINK-18002
Jim Chen 于2020年7月6日周一 上午11:28写道：
> Hi,
> 可以通过以下步骤还原车祸现场：
> kafka topic: test_action
> kafka message:
> {"action": [{"actionID": "id001", "actionName": "aaa"}, {"actionID":
> "id002", "actionName": "bbb"} ] }
>
> 代码Problem2.java：
> package com.flink;
>
> import
> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
> import org.apache.flink.table.api.EnvironmentSettings;
> import org.apache.flink.table.api.Table;
> import org.apache.flink.table.api.java.StreamTableEnvironment;
> import org.apache.flink.types.Row;
>
> /**
> *
> * 在自定义tableFunction的时候，如果SQL中传入的是ARRAY类型，
> * 那么在eval方法接收到的就是Row[]，
> * 问题出在，Row[]中的数据获取不到，里面的元素都是NULL
> *
> * 现在思路：就是在定义表的时候，把ARRYA看成STRING，
> * 现在的问题，就是查询出来，都是空
> *
> * kafka topic: test_action
> *
> * kafka message:
> * {"action": [{"actionID": "id001", "actionName": "aaa"}, {"actionID":
> "id002", "actionName": "bbb"} ] }
> */
> public class Problem2 {
>
> public static void main(String[] args) throws Exception {
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> EnvironmentSettings envSettings = EnvironmentSettings.newInstance()
> .useBlinkPlanner()
> .inStreamingMode()
> .build();
> StreamTableEnvironment bsEnv = StreamTableEnvironment.create(env,
> envSettings);
> bsEnv.registerFunction("explode3", new ExplodeFunction());
>
> String ddlSource = "CREATE TABLE actionTable3 (\n" +
> "action STRING\n" +
> ") WITH (\n" +
> "'connector.type' = 'kafka',\n" +
> "'connector.version' = '0.11',\n" +
> "'connector.topic' = 'test_action',\n" +
> "'connector.startup-mode' = 'earliest-offset',\n" +
> "'connector.properties.zookeeper.connect' =
> 'localhost:2181',\n" +
> "'connector.properties.bootstrap.servers' =
> 'localhost:9092',\n" +
> "'update-mode' = 'append',\n" +
> "'format.type' = 'json',\n" +
> "'format.derive-schema' = 'false',\n" +
> "'format.json-schema' = '{\"type\": \"object\",
> \"properties\": {\"action\": {\"type\": \"string\"} } }'" +
> ")";
> System.out.println(ddlSource);
> bsEnv.sqlUpdate(ddlSource);
>
> Table table = bsEnv.sqlQuery("select * from actionTable3");
> //Table table = bsEnv.sqlQuery("select * from actionTable2, LATERAL
> TABLE(explode3(`action`)) as T(`word`)");
> table.printSchema();
> bsEnv.toAppendStream(table, Row.class)
> .print();// 输出都是空
>
> bsEnv.execute("ARRAY tableFunction Problem");
> }
> }
>
--
Best,
Benchao Li
