@Override
	public VarKeyRecordNode getPreviousLeaf() throws IOException {
		VarKeyRecordNode leaf = null;
		int prevLeafId = buffer.getInt(PREV_LEAF_ID_OFFSET);
		if (prevLeafId >= 0) {
			leaf = (VarKeyRecordNode) nodeMgr.getVarKeyNode(prevLeafId);
		}
		return leaf;
	}
Get this leaf node's left sibling
@return this leaf node's left sibling or null if left sibling does not exist.
@throws IOException if an IO error occurs
Ghidra/Framework/DB/src/main/java/db/VarKeyRecordNode.java