LongKeyRecordNode getPreviousLeaf() throws IOException {
		LongKeyRecordNode leaf = null;
		int nextLeafId = buffer.getInt(PREV_LEAF_ID_OFFSET);
		if (nextLeafId >= 0) {
			leaf = (LongKeyRecordNode) nodeMgr.getLongKeyNode(nextLeafId);
		}
		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 thrown if an IO error occurs
Ghidra/Framework/DB/src/main/java/db/LongKeyRecordNode.java