Possibly better fix.

src/IO/WriteBufferFromS3.cpp

@@ -56,7 +56,6 @@ WriteBufferFromS3::WriteBufferFromS3(
         initiate();
 }
 
-
 void WriteBufferFromS3::nextImpl()
 {
     if (!offset())
@@ -79,23 +78,31 @@ void WriteBufferFromS3::nextImpl()
     }
 }
 
-
 void WriteBufferFromS3::finalize()
 {
-    next();
+    finalizeImpl();
-
-    if (is_multipart)
-        writePart(temporary_buffer->str());
-
-    complete();
 }
 
+void WriteBufferFromS3::finalizeImpl()
+{
+    if (!finalized)
+    {
+        next();
+
+        if (is_multipart)
+            writePart(temporary_buffer->str());
+
+        complete();
+
+        finalized = true;
+    }
+}
 
 WriteBufferFromS3::~WriteBufferFromS3()
 {
     try
     {
-        next();
+        finalizeImpl();
     }
     catch (...)
     {
@@ -103,7 +110,6 @@ WriteBufferFromS3::~WriteBufferFromS3()
     }
 }
 
-
 void WriteBufferFromS3::initiate()
 {
     Aws::S3::Model::CreateMultipartUploadRequest req;

src/IO/WriteBufferFromS3.h

@@ -57,9 +57,13 @@ public:
     ~WriteBufferFromS3() override;
 
 private:
+    bool finalized = false;
+
     void initiate();
     void writePart(const String & data);
     void complete();
+
+    void finalizeImpl();
 };
 
 }

src/IO/ZlibDeflatingWriteBuffer.cpp

@@ -116,7 +116,6 @@ void ZlibDeflatingWriteBuffer::finish()
 
         if (rc == Z_STREAM_END)
         {
-            out->finalize();
             finished = true;
             return;
         }