[kylin] 01/06: minor, toString() should not return null

[nic]

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nic pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/kylin.git

commit 28b83a3c35f94a66405b7538cb528b1702758f9c
Author: etherge <ethe...@163.com>
AuthorDate: Fri Feb 14 17:34:04 2020 -0500

    minor, toString() should not return null
---
 core-common/src/main/java/org/apache/kylin/common/util/ByteArray.java   | 2 +-
 .../test/java/org/apache/kylin/storage/gtrecord/DictGridTableTest.java  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git 
a/core-common/src/main/java/org/apache/kylin/common/util/ByteArray.java 
b/core-common/src/main/java/org/apache/kylin/common/util/ByteArray.java
index f961501..5954e2c 100644
--- a/core-common/src/main/java/org/apache/kylin/common/util/ByteArray.java
+++ b/core-common/src/main/java/org/apache/kylin/common/util/ByteArray.java
@@ -165,7 +165,7 @@ public class ByteArray implements Comparable<ByteArray>, 
Serializable {
     @Override
     public String toString() {
         if (data == null)
-            return null;
+            return "";
         else
             return Bytes.toStringBinary(data, offset, length);
     }
diff --git 
a/core-storage/src/test/java/org/apache/kylin/storage/gtrecord/DictGridTableTest.java
 
b/core-storage/src/test/java/org/apache/kylin/storage/gtrecord/DictGridTableTest.java
index d80df78..a6a54ee 100644
--- 
a/core-storage/src/test/java/org/apache/kylin/storage/gtrecord/DictGridTableTest.java
+++ 
b/core-storage/src/test/java/org/apache/kylin/storage/gtrecord/DictGridTableTest.java
@@ -314,7 +314,7 @@ public class DictGridTableTest extends 
LocalFileMetadataTestCase {
 
         // note the unEvaluatable column 1 in filter is added to group by
         assertEquals(
-                "GTScanRequest [range=[[null, null]-[null, null]], columns={0, 
1, 3}, filterPushDown=AND [UNKNOWN_MODEL:NULL.GT_MOCKUP_TABLE.0 GT 
[\\x00\\x00\\x01J\\xE5\\xBD\\x5C\\x00], [null], [null]], aggrGroupBy={0, 1}, 
aggrMetrics={3}, aggrMetricsFuncs=[sum]]",
+                "GTScanRequest [range=[[null, null]-[null, null]], columns={0, 
1, 3}, filterPushDown=AND [UNKNOWN_MODEL:NULL.GT_MOCKUP_TABLE.0 GT 
[\\x00\\x00\\x01J\\xE5\\xBD\\x5C\\x00], [], []], aggrGroupBy={0, 1}, 
aggrMetrics={3}, aggrMetricsFuncs=[sum]]",
                 req.toString());
 
         doScanAndVerify(table, useDeserializedGTScanRequest(req), 
"[1421280000000, 20, null, 20, null]",