Fixed issue with #n1ql.bucket evaluated as collection name in string based queries. (#1804)

Closes #1799

Author: babltiga

src/main/java/org/springframework/data/couchbase/repository/query/StringBasedN1qlQueryParser.java

@@ -62,6 +62,7 @@
 /**
  * @author Subhashni Balakrishnan
  * @author Michael Reiche
+ * @author Tigran Babloyan
  */
 public class StringBasedN1qlQueryParser {
 	public static final String SPEL_PREFIX = "n1ql";
@@ -166,7 +167,7 @@ public StringBasedN1qlQueryParser(String statement, CouchbaseQueryMethod queryMe
 		this.queryMethod = queryMethod;
 		this.couchbaseConverter = couchbaseConverter;
 		this.statementContext = queryMethod == null ? null
-				: createN1qlSpelValues(collection != null ? collection : bucketName, scope, collection,
+				: createN1qlSpelValues(bucketName, scope, collection,
 				queryMethod.getEntityInformation().getJavaType(), typeField, typeValue, queryMethod.isCountQuery(), null, null);
 		this.parsedExpression = getExpression(statement, queryMethod, accessor, spelExpressionParser,
 				evaluationContextProvider);

src/test/java/org/springframework/data/couchbase/repository/query/StringN1qlQueryCreatorTests.java

@@ -208,7 +208,7 @@ void spelTests() throws Exception {
 
 		assertEquals("SELECT `_class`, `jsonNode`, `jsonObject`, `jsonArray`, META(`myCollection`).`cas`"
 				+ " AS __cas, `createdBy`, `createdDate`, `lastModifiedBy`, `lastModifiedDate`, META(`myCollection`).`id`"
-				+ " AS __id, `firstname`, `lastname`, `subtype` FROM `myCollection`|`_class` = \"abstractuser\"|`myCollection`|`myScope`|`myCollection`",
+				+ " AS __id, `firstname`, `lastname`, `subtype` FROM `myCollection`|`_class` = \"abstractuser\"|`some_bucket`|`myScope`|`myCollection`",
 				query.toN1qlSelectString(converter, bucketName(), "myScope", "myCollection", User.class, null, false, null,
 						null));
 	}