[Java] Exception when trying to load next batch while reading a parquet file

### Describe the bug, including details regarding any error messages, version, and platform.

Getting this exception when trying to load next batch while reading a parquet file.
The parsing works if the batch size is big enough to process all the parquet contents in one shot. But if I try to give a smaller batch size , the code breaks giving the below exception

java.lang.IllegalArgumentException: should have as many children as in the schema: found 0 expected 8
at org.apache.arrow.util.Preconditions.checkArgument(Preconditions.java:282)
at org.apache.arrow.vector.VectorLoader.loadBuffers(VectorLoader.java:127)
at org.apache.arrow.vector.VectorLoader.load(VectorLoader.java:84)
at org.apache.arrow.c.Data.importIntoVectorSchemaRoot(Data.java:334)
at org.apache.arrow.dataset.jni.NativeScanner$NativeReader.loadNextBatch(NativeScanner.java:151)

### Component(s)

Java

首先，在批次大小小於完整內容的情況下載入 parquet 檔案，重現該失敗。閱讀 NativeScanner.java 中的 loadNextBatch，然後追蹤經過 Data.importIntoVectorSchemaRoot 和 VectorLoader.loadBuffers 的呼叫。完成的標準是後續批次能夠在不觸發 schema-child-count exception 的情況下載入，但 issue 沒有提供測試檔案或重現檔案。

由索引模型根據 Issue 內容生成。