hanningning created FLINK-7852:
----------------------------------
Summary: An input of GenericTypeInfo<Row> cannot be converted to
Table
Key: FLINK-7852
URL: https://issues.apache.org/jira/browse/FLINK-7852
Project: Flink
Issue Type: Bug
Components: Table API & SQL
Affects Versions: 1.3.2
Reporter: hanningning
Dear All:
I'm starting to learn about Flink,and I have a question about Table API&SQL
as follows. It will be much appreciated to get your help ASAP.
I tried to convert a stream into a table. The initial data type of this
stream is String, and I converted the String type to Row through the map
method, then converted this Row type DataStream to a Table, but I got a error,
the error details is following:
=================The error msg=======================================
Exception in thread "main" org.apache.flink.table.api.TableException: An input
of GenericTypeInfo<Row> cannot be converted to Table. Please specify the type
of the input with a RowTypeInfo.
at
org.apache.flink.table.api.TableEnvironment.getFieldInfo(TableEnvironment.scala:620)
at
org.apache.flink.table.api.StreamTableEnvironment.registerDataStreamInternal(StreamTableEnvironment.scala:398)
at
org.apache.flink.table.api.java.StreamTableEnvironment.fromDataStream(StreamTableEnvironment.scala:88)
at
com.xiaoju.manhattan.fbi.data.calc.test.TableDynamicRowTest.main(TableDynamicRowTest.java:85)
In addition, My code as below:
========================My Code==================================
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment environment =
StreamExecutionEnvironment.getExecutionEnvironment();
environment.getConfig().disableSysoutLogging();
StreamTableEnvironment tableEnvironment =
TableEnvironment.getTableEnvironment(environment);
DataStream<String> dataStream = environment.addSource(new
SourceFunction<String>() {
private String str1 =
"{\"name\":\"name-value\",\"age\":\"28\",\"sex\":\"1\"}";
private long count = 0L;
private volatile boolean isRunning = true;
@Override
public void run(SourceContext<String> ctx) throws Exception {
while (isRunning && count<2){
synchronized (ctx.getCheckpointLock()){
ctx.collect(str1);
count++;
}
}
}
@Override
public void cancel() {
isRunning = false;
}
});
DataStream<JsonNode> dataStreamJson = dataStream.map(new
MapFunction<String, JsonNode>() {
@Override
public JsonNode map(String s) throws Exception {
ObjectMapper objectMapper = new ObjectMapper();
JsonNode node = objectMapper.readTree(s);
return node;
}
});
DataStream<Row> dataStreamRow = dataStreamJson.map(new
MapFunction<JsonNode, Row>() {
@Override
public Row map(JsonNode jsonNode) throws Exception {
int pos = 0;
Row row = new Row(jsonNode.size());
Iterator<String> iterator = jsonNode.fieldNames();
while (iterator.hasNext()){
String key = iterator.next();
row.setField(pos,jsonNode.get(key).asText());
pos++;
}
return row;
}
});
dataStreamRow.addSink(new SinkFunction<Row>() {
@Override
public void invoke(Row value) throws Exception {
System.out.println(value.getField(0));
}
});
Table myTable = tableEnvironment.fromDataStream(dataStreamRow);
Table result = myTable.select("f0");
DataStream<String> dataStreamResult =
tableEnvironment.toAppendStream(result,String.class);
dataStreamResult.print();
environment.execute();
}
Waiting for your earlier reply, thanks.
Best Wishes,
Han
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