ORC-216: VectorRowBatch creation from TypeDescription invalidates batch size

[prasanthj]

TypeDescription.createRowBatch() always resets the size to 0.

orc/java/core/src/java/org/apache/orc/TypeDescription.java

Lines 669 to 680 in 1ef78bb

	public VectorizedRowBatch createRowBatch(int maxSize) {
	VectorizedRowBatch result;
	if (category == Category.STRUCT) {
	result = new VectorizedRowBatch(children.size(), maxSize);
	for(int i=0; i < result.cols.length; ++i) {
	result.cols[i] = children.get(i).createColumn(maxSize);
	}
	} else {
	result = new VectorizedRowBatch(1, maxSize);
	result.cols[0] = createColumn(maxSize);
	}
	result.reset();

[omalley]

This isn't a bug. The batch has no rows when created and thus batch.size should be 0. batch.getMaxSize() will return the capacity.