Added new db query to fetch a list of all accounts that have created a non-self-share, based on confirmed transactions.

This will be used as the input dataset for the self sponsorship algo.

src/main/java/org/qortal/repository/TransactionRepository.java

@@ -179,6 +179,15 @@ public interface TransactionRepository {
 	public List<TransferAssetTransactionData> getAssetTransfers(long assetId, String address, Integer limit, Integer offset, Boolean reverse)
 			throws DataException;
 
+	/**
+	 * Returns list of reward share transaction creators, excluding self shares.
+	 * This uses confirmed transactions only.
+	 *
+	 * @return
+	 * @throws DataException
+	 */
+	public List<String> getConfirmedRewardShareCreatorsExcludingSelfShares() throws DataException;
+
 	/**
 	 * Returns list of transactions pending approval, with optional txGgroupId filtering.
 	 * <p>

src/main/java/org/qortal/repository/hsqldb/transaction/HSQLDBTransactionRepository.java

@@ -7,11 +7,7 @@ import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.sql.ResultSet;
 import java.sql.SQLException;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.EnumMap;
-import java.util.EnumSet;
-import java.util.List;
-import java.util.Map;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -969,6 +965,33 @@ public class HSQLDBTransactionRepository implements TransactionRepository {
 		}
 	}
 
+	public List<String> getConfirmedRewardShareCreatorsExcludingSelfShares() throws DataException {
+		List<String> rewardShareCreators = new ArrayList<>();
+
+		String sql = "SELECT account "
+				+ "FROM RewardShareTransactions "
+				+ "JOIN Accounts ON Accounts.public_key = RewardShareTransactions.minter_public_key "
+				+ "JOIN Transactions ON Transactions.signature = RewardShareTransactions.signature "
+				+ "WHERE block_height IS NOT NULL AND RewardShareTransactions.recipient != Accounts.account "
+				+ "GROUP BY account "
+				+ "ORDER BY account";
+
+		try (ResultSet resultSet = this.repository.checkedExecute(sql)) {
+			if (resultSet == null)
+				return rewardShareCreators;
+
+			do {
+				String address = resultSet.getString(1);
+
+				rewardShareCreators.add(address);
+			} while (resultSet.next());
+
+			return rewardShareCreators;
+		} catch (SQLException e) {
+			throw new DataException("Unable to fetch reward share creators from repository", e);
+		}
+	}
+
 	@Override
 	public List<TransactionData> getApprovalPendingTransactions(Integer txGroupId, Integer limit, Integer offset, Boolean reverse) throws DataException {
 		StringBuilder sql = new StringBuilder(512);