gj-zhang commented on issue #7387:
URL:
https://github.com/apache/incubator-doris/issues/7387#issuecomment-993191858
@JNSimba i change the type to varchar, same error.
and stacktrace
```java
org.apache.doris.flink.backend.BackendClient#openScanner
logger.debug("OpenScanner to '{}', parameter is '{}'.", routing, openParams);
if (!isConnected) {
open();
}
TException ex = null;
for (int attempt = 0; attempt < retries; ++attempt) {
logger.debug("Attempt {} to openScanner {}.", attempt, routing);
try {
TScanOpenResult result = client.openScanner(openParams);
if (result == null) {
logger.warn("Open scanner result from {} is null.",
routing);
continue;
}
...
```
```shell
Caused by: java.lang.NullPointerException
at
org.apache.doris.flink.rest.SchemaUtils.lambda$convertToSchema$0(SchemaUtils.java:36)
at
java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
at
java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
at
org.apache.doris.flink.rest.SchemaUtils.convertToSchema(SchemaUtils.java:36)
at
org.apache.doris.flink.datastream.ScalaValueReader.<init>(ScalaValueReader.scala:127)
at
org.apache.doris.flink.table.DorisRowDataInputFormat.open(DorisRowDataInputFormat.java:96)
at
org.apache.doris.flink.table.DorisRowDataInputFormat.open(DorisRowDataInputFormat.java:45)
at
org.apache.flink.streaming.api.functions.source.InputFormatSourceFunction.run(InputFormatSourceFunction.java:85)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:100)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:63)
at
org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:213)
```
the field of TScanColumnDesc, type is null.
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