ferenc-csaky commented on code in PR #23443:
URL: https://github.com/apache/flink/pull/23443#discussion_r1386659760


##########
flink-core/src/main/java/org/apache/flink/api/common/io/FileInputFormat.java:
##########
@@ -157,6 +157,10 @@ protected static InflaterInputStreamFactory<?> 
getInflaterInputStreamFactory(
         }
     }
 
+    public static Set<String> getSupportedCompressionFormats() {

Review Comment:
   I'd mark this `@VisibleForTesting`, because only tests use this function.



##########
flink-core/src/test/java/org/apache/flink/testutils/TestFileUtils.java:
##########
@@ -136,6 +138,26 @@ public static String createTempFileDirExtension(
         return f.toURI().toString();
     }
 
+    public static String createTempTextFileDirForAllCompressionFormats(File 
tempDir)

Review Comment:
   I think instead of bringing the specific `FileInputFormat` into this general 
utility, it would be cleaner to pass `Set<String> extensions` as a parameter.



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