storage/engine: fix DeleteRange+ApplyBatchRepr

Added support for DeleteRange to DBBatchInserter. This missing support
was causing test failures and various data corruption when enabling
COCKROACH_ENABLE_FAST_CLEAR_RANGE after cockroachdb#14138 started using
ApplyBatchRepr on batches containing DeleteRange operations.

See cockroachdb#14391

pkg/storage/engine/db.cc

@@ -509,8 +509,16 @@ class DBBatchInserter : public rocksdb::WriteBatch::Handler {
   virtual void Merge(const rocksdb::Slice& key, const rocksdb::Slice& value) {
     batch_->Merge(key, value);
   }
-  // NB: we don't support DeleteRangeCF yet which causes us to pick up
-  // the default implementation that returns an error.
+  virtual rocksdb::Status DeleteRangeCF(
+      uint32_t column_family_id,
+      const rocksdb::Slice& begin_key,
+      const rocksdb::Slice& end_key) {
+    if (column_family_id == 0) {
+      batch_->DeleteRange(begin_key, end_key);
+      return rocksdb::Status::OK();
+    }
+    return rocksdb::Status::InvalidArgument("DeleteRangeCF not implemented");
+  }
 
  private:
   rocksdb::WriteBatchBase* const batch_;

pkg/storage/engine/engine_test.go

@@ -610,6 +610,23 @@ func TestEngineDeleteRange(t *testing.T) {
 	})
 }
 
+func TestEngineDeleteRangeBatch(t *testing.T) {
+	defer leaktest.AfterTest(t)()
+	testEngineDeleteRange(t, func(engine Engine, start, end MVCCKey) error {
+		batch := engine.NewWriteOnlyBatch()
+		defer batch.Close()
+		if err := batch.ClearRange(start, end); err != nil {
+			return err
+		}
+		batch2 := engine.NewWriteOnlyBatch()
+		defer batch2.Close()
+		if err := batch2.ApplyBatchRepr(batch.Repr(), false); err != nil {
+			return err
+		}
+		return batch2.Commit(false)
+	})
+}
+
 func TestEngineDeleteIterRange(t *testing.T) {
 	defer leaktest.AfterTest(t)()
 	testEngineDeleteRange(t, func(engine Engine, start, end MVCCKey) error {