Two same new field with and without Term vector make an IllegalStateException
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                 Key: LUCENE-766
                 URL: https://issues.apache.org/jira/browse/LUCENE-766
             Project: Lucene - Java
          Issue Type: Bug
          Components: Index
    Affects Versions: 2.1
            Reporter: Nicolas Lalevée


On a empty index, adding a document with two fields with the same name but with 
different term vector option fail. The field with 
TermVector.WITH_POSITIONS_OFFSETS is correctly indexed, as the offset are 
correclty extracted. The field with TermVector.NO is not. The TermVectorsWriter 
tries to add offset info given to the data of the filedinfo from the "fnm" 
file, but the DocumentWriter didn't prepared offset datas as it gets its info 
from the field itself, not from the fieldinfo.

Here is the stack trace :
java.lang.IllegalStateException: Trying to write offsets that are null!
        at 
org.apache.lucene.index.TermVectorsWriter.writeField(TermVectorsWriter.java:311)
        at 
org.apache.lucene.index.TermVectorsWriter.closeField(TermVectorsWriter.java:142)
        at 
org.apache.lucene.index.TermVectorsWriter.closeDocument(TermVectorsWriter.java:100)
        at 
org.apache.lucene.index.TermVectorsWriter.close(TermVectorsWriter.java:240)
        at 
org.apache.lucene.index.DocumentWriter.writePostings(DocumentWriter.java:365)
        at 
org.apache.lucene.index.DocumentWriter.addDocument(DocumentWriter.java:114)
        at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:618)
        at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:601)
        at 
org.apache.lucene.index.TestDocumentWriter.testTermVector(TestDocumentWriter.java:147)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at junit.framework.TestCase.runTest(TestCase.java:164)
        at junit.framework.TestCase.runBare(TestCase.java:130)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:120)
        at junit.framework.TestSuite.runTest(TestSuite.java:230)
        at junit.framework.TestSuite.run(TestSuite.java:225)
        at 
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
        at 
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
        at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

Attaching a patch with a test.

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