vector/src/main/java/org/apache/arrow/vector/complex/FixedSizeListVector.java [166:179]:
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  public void loadFieldBuffers(ArrowFieldNode fieldNode, List<ArrowBuf> ownBuffers) {
    if (ownBuffers.size() != 1) {
      throw new IllegalArgumentException(
          "Illegal buffer count, expected " + 1 + ", got: " + ownBuffers.size());
    }

    ArrowBuf bitBuffer = ownBuffers.get(0);

    validityBuffer.getReferenceManager().release();
    validityBuffer = BitVectorHelper.loadValidityBuffer(fieldNode, bitBuffer, allocator);
    valueCount = fieldNode.getLength();

    validityAllocationSizeInBytes = checkedCastToInt(validityBuffer.capacity());
  }
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vector/src/main/java/org/apache/arrow/vector/complex/StructVector.java [160:172]:
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  public void loadFieldBuffers(ArrowFieldNode fieldNode, List<ArrowBuf> ownBuffers) {
    if (ownBuffers.size() != 1) {
      throw new IllegalArgumentException(
          "Illegal buffer count, expected " + 1 + ", got: " + ownBuffers.size());
    }

    ArrowBuf bitBuffer = ownBuffers.get(0);

    validityBuffer.getReferenceManager().release();
    validityBuffer = BitVectorHelper.loadValidityBuffer(fieldNode, bitBuffer, allocator);
    valueCount = fieldNode.getLength();
    validityAllocationSizeInBytes = checkedCastToInt(validityBuffer.capacity());
  }
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