Hi Jim,
This is a known issue[1], could you verify that if this issue meets your
requirements?
[1] https://issues.apache.org/jira/browse/FLINK-18002
Jim Chen 于2020年7月6日周一 下午1:28写道：
> Hi, everyone!
>
> When i use flink1.10 to define table, and i want to define the json array
> as the string type. But the query resutl is null when i execute the program.
> The detail code as follow:
>
> 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;
>
> /**
> * 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' = 'true',\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();// the result is null
>
> bsEnv.execute("ARRAY tableFunction Problem");
> }
> }
>
--
Best,
Benchao Li
