Add test to make sure DropColumnFamily doesn't impact existing iterators

Summary: Add a test case in ColumnFamilyTest.ReadDroppedColumnFamily to make sure existing iterator is not impacted by column family dropping.

Test Plan: N/A

Reviewers: igor, yhchiang, anthony, andrewkr, kradhakrishnan, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D54657

db/column_family_test.cc

@@ -1952,6 +1952,11 @@ TEST_F(ColumnFamilyTest, ReadDroppedColumnFamily) {
     PutRandomData(1, kKeysNum, 100);
     PutRandomData(2, kKeysNum, 100);
 
+    {
+      std::unique_ptr<Iterator> iterator(
+          db_->NewIterator(ReadOptions(), handles_[2]));
+      iterator->SeekToFirst();
+
       if (iter == 0) {
         // Drop CF two
         ASSERT_OK(db_->DropColumnFamily(handles_[2]));
@@ -1960,6 +1965,15 @@ TEST_F(ColumnFamilyTest, ReadDroppedColumnFamily) {
         delete handles_[2];
         handles_[2] = nullptr;
       }
+      // Make sure iterator created can still be used.
+      int count = 0;
+      for (; iterator->Valid(); iterator->Next()) {
+        ASSERT_OK(iterator->status());
+        ++count;
+      }
+      ASSERT_OK(iterator->status());
+      ASSERT_EQ(count, kKeysNum);
+    }
 
     // Add bunch more data to other CFs
     PutRandomData(0, kKeysNum, 100);