diff --git a/core/src/main/java/com/orientechnologies/orient/core/metadata/schema/OType.java b/core/src/main/java/com/orientechnologies/orient/core/metadata/schema/OType.java
index ebc2b920182..a2952140d8b 100755
--- a/core/src/main/java/com/orientechnologies/orient/core/metadata/schema/OType.java
+++ b/core/src/main/java/com/orientechnologies/orient/core/metadata/schema/OType.java
@@ -25,13 +25,7 @@
 import com.orientechnologies.common.log.OLogManager;
 import com.orientechnologies.common.types.OBinary;
 import com.orientechnologies.orient.core.db.ODatabaseRecordThreadLocal;
-import com.orientechnologies.orient.core.db.record.OIdentifiable;
-import com.orientechnologies.orient.core.db.record.ORecordLazyList;
-import com.orientechnologies.orient.core.db.record.ORecordLazyMap;
-import com.orientechnologies.orient.core.db.record.ORecordLazySet;
-import com.orientechnologies.orient.core.db.record.OTrackedList;
-import com.orientechnologies.orient.core.db.record.OTrackedMap;
-import com.orientechnologies.orient.core.db.record.OTrackedSet;
+import com.orientechnologies.orient.core.db.record.*;
 import com.orientechnologies.orient.core.db.record.ridbag.ORidBag;
 import com.orientechnologies.orient.core.id.ORID;
 import com.orientechnologies.orient.core.id.ORecordId;
@@ -44,20 +38,11 @@
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.text.ParseException;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.util.*;
 
 /**
- * Generic representation of a type.<br>
- * allowAssignmentFrom accepts any class, but Array.class means that the type accepts generic Arrays.
+ * Generic representation of a type.<br> allowAssignmentFrom accepts any class, but Array.class means that the type accepts generic
+ * Arrays.
  *
  * @author Luca Garulli (l.garulli--(at)--orientdb.com)
  */
@@ -457,6 +442,10 @@ else if (((String) iValue).equalsIgnoreCase("false"))
           }
         }
       } else if (iTargetClass.equals(String.class)) {
+        if (iValue instanceof Collection && ((Collection) iValue).size() == 1 && ((Collection) iValue).iterator()
+            .next() instanceof String) {
+          return ((Collection) iValue).iterator().next();
+        }
         return iValue.toString();
       } else if (iTargetClass.equals(OIdentifiable.class)) {
         if (OMultiValue.isMultiValue(iValue)) {
diff --git a/core/src/main/java/com/orientechnologies/orient/core/sql/parser/OInCondition.java b/core/src/main/java/com/orientechnologies/orient/core/sql/parser/OInCondition.java
index c22a8bfcdba..deb0ffa5649 100644
--- a/core/src/main/java/com/orientechnologies/orient/core/sql/parser/OInCondition.java
+++ b/core/src/main/java/com/orientechnologies/orient/core/sql/parser/OInCondition.java
@@ -103,8 +103,9 @@ protected static Object executeQuery(OSelectStatement rightStatement, OCommandCo
 
   protected static boolean evaluateExpression(final Object iLeft, final Object iRight) {
     if (OMultiValue.isMultiValue(iRight)) {
-      if (iRight instanceof Set<?>)
-        return ((Set) iRight).contains(iLeft);
+      if (iRight instanceof Set && ((Set) iRight).contains(iLeft)) {
+        return true;
+      }
 
       for (final Object o : OMultiValue.getMultiValueIterable(iRight, false)) {
         if (OQueryOperatorEquals.equals(iLeft, o))