kou commented on code in PR #95:
URL: https://github.com/apache/arrow-swift/pull/95#discussion_r2428968709


##########
Arrow/Sources/Arrow/ArrowWriter.swift:
##########
@@ -138,18 +138,26 @@ public class ArrowWriter { // swiftlint:disable:this 
type_body_length
         var rbBlocks = [org_apache_arrow_flatbuf_Block]()
 
         for batch in batches {
+            addPadForAlignment(&writer)
             let startIndex = writer.count
             switch writeRecordBatch(batch: batch) {
             case .success(let rbResult):
                 withUnsafeBytes(of: CONTINUATIONMARKER.littleEndian) 
{writer.append(Data($0))}
                 withUnsafeBytes(of: rbResult.1.o.littleEndian) 
{writer.append(Data($0))}
                 writer.append(rbResult.0)
+                addPadForAlignment(&writer)
+                let metadataEnd = writer.count
+                let metadataLength = metadataEnd - startIndex

Review Comment:
   Good point. Let's open an issue for it on https://github.com/apache/arrow .



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