@Override
	DBFieldIterator indexIterator(Field minField, Field maxField, Field startField, boolean before)
			throws IOException {
		return new IndexFieldIterator(minField, maxField, startField, before);
	}
Generate index table schema for specified primaryTable and index column
@param primaryTable primary table
@param colIndex index column
@return index table schema
Ghidra/Framework/DB/src/main/java/db/FieldIndexTable.java