@Override
		public Field previous() throws IOException {
			return keyIter.previous();
		}
Construct a record iterator. (requires DBHandle lock)
@param minKey minimum key value.  Null corresponds to minimum key value.
@param maxKey maximum key value.  Null corresponds to maximum key value.
@param before true if initial position is before range, else after range
@throws IOException thrown if IO error occurs
Ghidra/Framework/DB/src/main/java/db/Table.java