jacek-lewandowski commented on a change in pull request #1031:
URL: https://github.com/apache/cassandra/pull/1031#discussion_r643881676



##########
File path: 
test/unit/org/apache/cassandra/db/SSTableAndMemTableDigestMatchTest.java
##########
@@ -114,27 +148,47 @@ private void testWithFilter(Function<TableMetadata, 
ColumnFilter> filterFactory)
         execute("INSERT INTO %s (k, v1, v2, m) values (?, ?, ?, ?) USING 
TIMESTAMP ?", 1, 2, 3, m, writeTime);
 
         ColumnFamilyStore cfs = getCurrentColumnFamilyStore();
-        ColumnFilter filter = filterFactory.apply(cfs.metadata());
-        String digest1 = getDigest(filter);
+        
assertDigestsAreEqualsBeforeAndAfterFlush(filterFactory.apply(cfs.metadata()), 
Clustering.EMPTY);
+    }
+
+    private void testWithFilterAndStaticColumnsOnly(Function<TableMetadata, 
ColumnFilter> filterFactory) throws Throwable
+    {
+        createTable("CREATE TABLE %s (pk int, ck int, s1 int static, s2 int 
static, v int, PRIMARY KEY(pk, ck))");
+        execute("INSERT INTO %s (pk, s1, s2) VALUES (1, 1, 1) USING TIMESTAMP 
1000");
+        flush();
+        execute("INSERT INTO %s (pk, s1) VALUES (1, 2) USING TIMESTAMP 2000");
+        flush();
+        execute("DELETE s1 FROM %s USING TIMESTAMP 3000 WHERE pk = 1");
+        flush();
+
+        ColumnFamilyStore cfs = getCurrentColumnFamilyStore();
+        
assertDigestsAreEqualsBeforeAndAfterFlush(filterFactory.apply(cfs.metadata()));

Review comment:
       Using this assertion this way does not bring much value because the data 
is already flushed - so we check digest, flush again (but there nothing to 
flush, so this is no-op) and check digest.
   
   I suggest replacing each flush in this test with this assertion




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