void keyChanged(Field oldKey, byte[] newKeyData) {

		int index = getKeyIndex(oldKey);
		if (index < 0) {
			throw new AssertException();
		}
		// Update key
		putKey(index, newKeyData);
		if (index == 0 && parent != null) {
			parent.keyChanged(oldKey, newKeyData);
		}
	}
Callback method for when a child node's leftmost key changes.
@param oldKey previous leftmost key.
@param newKeyData new leftmost key.
Ghidra/Framework/DB/src/main/java/db/FixedKeyInteriorNode.java