Ensure DATETIME columns get Arrow coltype reset

libtiledbsoma/src/utils/arrow_adapter.cc

@@ -314,7 +314,7 @@ ArrowAdapter::to_arrow(std::shared_ptr<ColumnBuffer> column) {
   exitIfError(ArrowArrayAllocateChildren(arr, 0), "Bad array children alloc");
   array->length = column->size();
 
-  LOG_TRACE(fmt::format(
+  LOG_WARN(fmt::format(
       "[ArrowAdapter] column type {} name {} nbuf {} {} nullable {}",
       to_arrow_format(column->type()).data(), column->name().data(), n_buffers,
       array->n_buffers, column->is_nullable()));
@@ -359,8 +359,16 @@ ArrowAdapter::to_arrow(std::shared_ptr<ColumnBuffer> column) {
     column->data_to_bitmap();
   }
 
+  // Workaround for datetime
+  if (column->type() == TILEDB_DATETIME_MS || column->type() == TILEDB_DATETIME_SEC) {
+    free((void*)schema->format);       // free the 'storage' format
+    schema->format = strdup(to_arrow_format(column->type()).data());
+  }
+
   // Workaround for date
   if (column->type() == TILEDB_DATETIME_DAY) {
+    free((void*)schema->format);       // free the 'storage' format
+    schema->format = strdup(to_arrow_format(column->type()).data());
     // TODO: Put in ColumnBuffer
     size_t n = array->length;
     std::vector<int64_t> indata(n);