DATAMONGO-1057 - Polishing.

Slightly tweaked the changes in SlicedExecution to simplify the implementation. We now apply the given pageable but tweak the limit the query uses to peek into the next page.

Original pull request: spring-projects#226.

Author: odrotbohm

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/AbstractMongoQuery.java

@@ -233,8 +233,10 @@ Object execute(Query query) {
 			MongoEntityMetadata<?> metadata = method.getEntityInformation();
 			int pageSize = pageable.getPageSize();
 
-			List result = operations.find(query.skip(pageable.getOffset()).limit(pageSize + 1).with(pageable.getSort()),
-					metadata.getJavaType(), metadata.getCollectionName());
+			// Apply Pageable but tweak limit to peek into next page
+			Query modifiedQuery = query.with(pageable).limit(pageSize + 1);
+
+			List result = operations.find(modifiedQuery, metadata.getJavaType(), metadata.getCollectionName());
 
 			boolean hasNext = result.size() > pageSize;