[ 
https://issues.apache.org/jira/browse/ARROW-11788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Nick Bruno updated ARROW-11788:
-------------------------------
    Description: 
Attempting to append a list vector that is empty to another vector that is also 
empty using VectorAppender raises an NPE. Instead, it should just skip 
processing and do nothing.

 
{noformat}
java.lang.IndexOutOfBoundsException: index: 0, length: 4 (expected: range(0, 0))
 at org.apache.arrow.memory.ArrowBuf.checkIndexD(ArrowBuf.java:318)
 at org.apache.arrow.memory.ArrowBuf.chk(ArrowBuf.java:305)
 at org.apache.arrow.memory.ArrowBuf.getInt(ArrowBuf.java:424)
 at org.apache.arrow.vector.util.VectorAppender.visit(VectorAppender.java:195)
 at org.apache.arrow.vector.util.VectorAppender.visit(VectorAppender.java:45)
 at 
org.apache.arrow.vector.complex.ListVector.accept(ListVector.java:449){noformat}

  was:
Attempting to append a list vector that is empty to another vector that is also 
empty using VectorAppender raises an NPE. Instead, it should just skip 
processing and do nothing.

 
{noformat}
java.lang.IndexOutOfBoundsException: index: 0, length: 4 (expected: range(0, 
0))java.lang.IndexOutOfBoundsException: index: 0, length: 4 (expected: range(0, 
0))
 at org.apache.arrow.memory.ArrowBuf.checkIndexD(ArrowBuf.java:318) at 
org.apache.arrow.memory.ArrowBuf.chk(ArrowBuf.java:305) at 
org.apache.arrow.memory.ArrowBuf.getInt(ArrowBuf.java:424) at 
org.apache.arrow.vector.util.VectorAppender.visit(VectorAppender.java:195) at 
org.apache.arrow.vector.util.VectorAppender.visit(VectorAppender.java:45) at 
org.apache.arrow.vector.complex.ListVector.accept(ListVector.java:449){noformat}


> [Java] Appending Empty List Vector yields NPE
> ---------------------------------------------
>
>                 Key: ARROW-11788
>                 URL: https://issues.apache.org/jira/browse/ARROW-11788
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Java
>    Affects Versions: 3.0.0
>            Reporter: Nick Bruno
>            Priority: Major
>
> Attempting to append a list vector that is empty to another vector that is 
> also empty using VectorAppender raises an NPE. Instead, it should just skip 
> processing and do nothing.
>  
> {noformat}
> java.lang.IndexOutOfBoundsException: index: 0, length: 4 (expected: range(0, 
> 0))
>  at org.apache.arrow.memory.ArrowBuf.checkIndexD(ArrowBuf.java:318)
>  at org.apache.arrow.memory.ArrowBuf.chk(ArrowBuf.java:305)
>  at org.apache.arrow.memory.ArrowBuf.getInt(ArrowBuf.java:424)
>  at org.apache.arrow.vector.util.VectorAppender.visit(VectorAppender.java:195)
>  at org.apache.arrow.vector.util.VectorAppender.visit(VectorAppender.java:45)
>  at 
> org.apache.arrow.vector.complex.ListVector.accept(ListVector.java:449){noformat}



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