[GitHub] [arrow] isichei commented on a change in pull request #10461: ARROW-12096: [C++]: Allows users to define arrow timestamp unit for Parquet INT96 timestamp

[GitBox <gi...@apache.org>]

isichei commented on a change in pull request #10461:
URL: https://github.com/apache/arrow/pull/10461#discussion_r646852666



##########
File path: cpp/src/parquet/arrow/reader_internal.cc
##########
@@ -742,20 +752,20 @@ Status TransferColumnData(RecordReader* reader, std::shared_ptr<DataType> value_
     case ::arrow::Type::TIMESTAMP: {
       const ::arrow::TimestampType& timestamp_type =
           checked_cast<::arrow::TimestampType&>(*value_type);
-      switch (timestamp_type.unit()) {
-        case ::arrow::TimeUnit::MILLI:
-        case ::arrow::TimeUnit::MICRO: {
-          result = TransferZeroCopy(reader, value_type);
-        } break;
-        case ::arrow::TimeUnit::NANO: {
-          if (descr->physical_type() == ::parquet::Type::INT96) {
-            RETURN_NOT_OK(TransferInt96(reader, pool, value_type, &result));
-          } else {
+      if (descr->physical_type() == ::parquet::Type::INT96) {
+            RETURN_NOT_OK(TransferInt96(reader, pool, value_type, &result, timestamp_type.unit()));
+        }
+      else {
+        switch (timestamp_type.unit()) {
+          case ::arrow::TimeUnit::SECOND:
+          case ::arrow::TimeUnit::MILLI:
+          case ::arrow::TimeUnit::MICRO:
+          case ::arrow::TimeUnit::NANO: {
             result = TransferZeroCopy(reader, value_type);
-          }
-        } break;
-        default:
-          return Status::NotImplemented("TimeUnit not supported");
+          } break;
+          default:

Review comment:
       I don't think so. I was just copying how others had written switch expressions in the existing codebase. Will remove 👍  




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