[Bug] When executing an insert operation on a Hive partitioned table, an array out-of-bounds error occurs

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Paimon version

1.3.1

### Compute Engine

hive3.1.3

### Minimal reproduce step

CREATE TABLE test_paimon2 (
id INT,
name STRING,
salary DOUBLE,
department STRING
)
partitioned by (dt string)
STORED BY 'org.apache.paimon.hive.PaimonStorageHandler'
TBLPROPERTIES (
'primary-key' = 'id,dt',
'bucket' = '-1',
'file.format' = 'parquet'
);

INSERT INTO TABLE test_paimon2
partition (dt='2026')
VALUES
(1, 'Alice', 5000.0, 'IT'),
(2, 'Bob', 6000.0, 'HR'),
(3, 'Charlie', 5500.0, 'IT');

### What doesn't meet your expectations?

Diagnostic Messages for this Task:
Error: java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing writable (null)
at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:163)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
at org.apache.hadoop.hive.ql.exec.mr.ExecMapRunner.run(ExecMapRunner.java:37)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:465)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:349)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:174)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1729)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing writable (null)
at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:568)
at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:154)
... 9 more
Caused by: java.lang.RuntimeException: java.lang.ArrayIndexOutOfBoundsException: 4
at org.apache.paimon.hive.mapred.PaimonRecordWriter.write(PaimonRecordWriter.java:69)
at org.apache.hadoop.hive.ql.exec.FileSinkOperator.process(FileSinkOperator.java:987)
at org.apache.hadoop.hive.ql.exec.Operator.baseForward(Operator.java:995)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:941)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:928)
at org.apache.hadoop.hive.ql.exec.SelectOperator.process(SelectOperator.java:95)
at org.apache.hadoop.hive.ql.exec.Operator.baseForward(Operator.java:995)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:941)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:928)
at org.apache.hadoop.hive.ql.exec.UDTFOperator.forwardUDTFOutput(UDTFOperator.java:133)
at org.apache.hadoop.hive.ql.udf.generic.UDTFCollector.collect(UDTFCollector.java:45)
at org.apache.hadoop.hive.ql.udf.generic.GenericUDTF.forward(GenericUDTF.java:110)
at org.apache.hadoop.hive.ql.udf.generic.GenericUDTFInline.process(GenericUDTFInline.java:64)
at org.apache.hadoop.hive.ql.exec.UDTFOperator.process(UDTFOperator.java:116)
at org.apache.hadoop.hive.ql.exec.Operator.baseForward(Operator.java:995)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:941)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:928)
at org.apache.hadoop.hive.ql.exec.SelectOperator.process(SelectOperator.java:95)
at org.apache.hadoop.hive.ql.exec.Operator.baseForward(Operator.java:995)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:941)
at org.apache.hadoop.hive.ql.exec.TableScanOperator.process(TableScanOperator.java:125)
at org.apache.hadoop.hive.ql.exec.MapOperator$MapOpCtx.forward(MapOperator.java:153)
at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:555)
... 10 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 4
at org.apache.paimon.data.GenericRow.isNullAt(GenericRow.java:132)
at org.apache.paimon.table.sink.TableWriteImpl.checkNullability(TableWriteImpl.java:197)
at org.apache.paimon.table.sink.TableWriteImpl.writeAndReturn(TableWriteImpl.java:184)
at org.apache.paimon.table.sink.TableWriteImpl.writeAndReturn(TableWriteImpl.java:179)
at org.apache.paimon.table.sink.TableWriteImpl.write(TableWriteImpl.java:157)
at org.apache.paimon.hive.mapred.PaimonRecordWriter.write(PaimonRecordWriter.java:67)
... 32 more

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start with org.apache.paimon.hive.mapred.PaimonRecordWriter.java:69 and follow the row shape into GenericRow.isNullAt and TableWriteImpl.checkNullability. Reproduce the Hive 3.1.3 insert against the partitioned table, then verify the insert completes without ArrayIndexOutOfBoundsException and writes the supplied rows.

Written by the indexing model from the issue text.