@Override
	RecordIterator getSymbolsByNameAndNamespace(String name, long id) throws IOException {
		// create a range of hash fields for all symbols with this name and namespace id over all
		// possible addresses
		Field start = computeLocatorHash(name, id, MIN_ADDRESS_OFFSET);
		if (start == null) {
			return EmptyRecordIterator.INSTANCE;
		}

		Field end = computeLocatorHash(name, id, MAX_ADDRESS_OFFSET);

		RecordIterator it = symbolTable.indexIterator(SYMBOL_HASH_COL, start, end, true);
		return getNameAndNamespaceFilterIterator(name, id, it);
	}
SymbolDatabaseAdapter for version 3

This version added additional sparse columns to store optional data specific to certain
symbol types.  The adhoc string data column was eliminated.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/SymbolDatabaseAdapterV4.java