wgtmac commented on code in PR #1089:
URL: https://github.com/apache/orc/pull/1089#discussion_r851860205


##########
c++/test/TestWriter.cc:
##########
@@ -1996,5 +1996,5 @@ namespace orc {
     }
   }
 
-  INSTANTIATE_TEST_CASE_P(OrcTest, WriterTest, Values(FileVersion::v_0_11(), 
FileVersion::v_0_12()));
+  INSTANTIATE_TEST_CASE_P(OrcTest, WriterTest, Values(FileVersion::v_0_11(), 
FileVersion::v_0_12(), FileVersion::UNSTABLE_PRE_2_0()));

Review Comment:
   Should we generate some ORC files and add some test cases for cross-language 
compatibility? We have had issues when Java ORC reader cannot understand bloom 
filter produced by the C++ writer (which is caught by @stiga-huang). We may be 
safely assured when test cases report that the Java ORC reader can correctly 
read UNSTABLE_PRE_2_0 file created by the C++ ORC writer and vice versa. 
@dongjoon-hyun @stiga-huang @coderex2522 



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