[orientdb] Index.contains() of NOTUNIQUE_HASH_INDEX always returns true for any key even in empty DB

[Adithyan K]

Team,

Index.contains() of NOTUNIQUE_HASH_INDEX always returns true for any key 
even in empty DB.
Is it the behavior???

Should I always get the Set from Index and check its size for existence?

Attaching the simple code, that just creates the database and an 
NOTUNIQUE_HASH_INDEX index. Then immediate calling Index.contains() for any 
random value returns true always...!!!

Reg,

K Adithyan

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package adi.orientdb.eval;

import com.orientechnologies.orient.core.db.OPartitionedDatabasePool;
import com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx;
import com.orientechnologies.orient.core.index.OIndex;
import com.orientechnologies.orient.core.index.OIndexManagerProxy;
import com.orientechnologies.orient.core.metadata.schema.OClass;
import com.orientechnologies.orient.core.metadata.schema.OType;
import java.util.concurrent.ExecutionException;

/**
 *
 * @author K Adithyan
 */
public class IndexContains
{
	static final String URL = "plocal:/tmp/plocaldb";
	static final String DATATYPE = "docnode";
	static final String KEYFIELD = "name";
	
	public static void main(String[] args) throws Exception
	{
		read();
		System.out.println("done!");
	}

	private static String indexName()
	{
		return DATATYPE + "." + KEYFIELD;
	}
	
	private static ODatabaseDocumentTx db() throws InterruptedException, ExecutionException
	{
		System.out.println("starting.....");

		try (ODatabaseDocumentTx base = new ODatabaseDocumentTx(URL))
		{
			if (!base.exists())
			{
				System.out.println("creating....");
				base.create();
				base.getMetadata().getSecurity().createUser("root", "root", "admin");
			}

			base.close();
		}

		OPartitionedDatabasePool pool = new OPartitionedDatabasePool(URL, "root", "root");

		ODatabaseDocumentTx db = pool.acquire();

		if (!db.getMetadata().getSchema().existsClass(DATATYPE))
		{
			OClass dataTypeClass = db.getMetadata().getSchema().createClass(DATATYPE);
			dataTypeClass.createProperty(KEYFIELD, OType.STRING);
			dataTypeClass.createIndex(indexName(), OClass.INDEX_TYPE.NOTUNIQUE_HASH_INDEX, KEYFIELD);

			System.out.println("created class = " + dataTypeClass);
		}

		final OIndexManagerProxy im = db.getMetadata().getIndexManager();
		OIndex index = im.getIndex(indexName());
		System.out.println("index = " + index.getConfiguration().toJSON());

		long doccount = db.countClass(DATATYPE);
		System.out.println("doccount of " + DATATYPE + " = " + doccount);

		return db;
	}

	private static void read() throws Exception
	{
		ODatabaseDocumentTx db = db();
		OIndexManagerProxy im = db.getMetadata().getIndexManager();
		OIndex<?> index = im.getIndex(indexName());
		
		System.out.println("contains1 = " + index.contains("Random-Key-1"));
		System.out.println("contains1 = " + index.contains("Random-Key-2"));
		System.out.println("contains1 = " + index.contains("Random-Key-3"));
		System.out.println("contains1 = " + index.contains("Random-Key-4"));
		
		System.out.println("index.get()-1 = " + index.get("Random-Key-1"));
		System.out.println("index.get()-2 = " + index.get("Random-Key-2"));
		System.out.println("index.get()-3 = " + index.get("Random-Key-3"));
		System.out.println("index.get()-4 = " + index.get("Random-Key-4"));
	}
}