[Fix](source) fix IndexOutOfBoundsException for union all

[JNSimba]

Proposed changes

Issue Number: close #xxx

Problem Summary:

Sometimes when using flinksql for unionall, the following error is reported

select * from doris_source where name in ('lisi','wangwu') union all SELECT * from doris_source where name = 'zhangsan' 

Caused by: java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
	at java.util.ArrayList.rangeCheck(ArrayList.java:659)
	at java.util.ArrayList.get(ArrayList.java:435)
	at org.apache.doris.flink.deserialization.converter.DorisRowConverter.convertInternal(DorisRowConverter.java:109)
	at org.apache.doris.flink.deserialization.RowDataDeserializationSchema.deserialize(RowDataDeserializationSchema.java:51)
	at org.apache.doris.flink.source.reader.DorisRecordEmitter.emitRecord(DorisRecordEmitter.java:44)
	at org.apache.doris.flink.source.reader.DorisRecordEmitter.emitRecord(DorisRecordEmitter.java:30)
	at org.apache.flink.connector.base.source.reader.SourceReaderBase.pollNext(SourceReaderBase.java:203)
	at org.apache.flink.streaming.api.operators.SourceOperator.emitNext(SourceOperator.java:422)
	at org.apache.flink.streaming.runtime.io.StreamTaskSourceInput.emitNext(StreamTaskSourceInput.java:68)
	at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:65)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:638)
	at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:231)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:973)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:917)
	at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:970)
	at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:949)
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:763)

Checklist(Required)

1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)

Further comments

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