@Override
	public FixedKeyRecordNode getLeftmostLeafNode() throws IOException {
		FixedKeyRecordNode leaf = getPreviousLeaf();
		return leaf != null ? leaf.getLeftmostLeafNode() : this;
	}
Get the key offset within the node's data buffer
@param index key/record index
@return positive record offset within buffer
Ghidra/Framework/DB/src/main/java/db/FixedKeyRecordNode.java