pitrou commented on a change in pull request #11198:
URL: https://github.com/apache/arrow/pull/11198#discussion_r713172904



##########
File path: cpp/src/arrow/csv/reader_test.cc
##########
@@ -176,20 +177,21 @@ void 
TestNestedParallelism(std::shared_ptr<internal::ThreadPool> thread_pool,
   ASSERT_EQ(table->num_rows(), NROWS);
 }
 
-void TestInvalidRowsSkipped(TableReaderFactory reader_factory, bool 
rows_counted) {
+void TestInvalidRowsSkipped(TableReaderFactory reader_factory, bool async) {
   const int NROWS = 1000;
   const int INVALID_EVERY = 20;
   const int NINVALID = 50;
 
   auto opts = ParseOptions::Defaults();
-  int num_invalid_rows = 0;
+  std::atomic<int> num_invalid_rows(0);
   opts.invalid_row_handler = [&](const InvalidRow& row) {
     ++num_invalid_rows;
-    if (rows_counted) {
+    if (async) {
+      // Row numbers are not counted in batches during async processing
+      EXPECT_EQ(-1, row.number);
+    } else {
       // actual data starts at row #2 in the CSV "file"
       EXPECT_EQ(num_invalid_rows * INVALID_EVERY + 1, row.number);

Review comment:
       Is `num_invalid_rows` still unchanged from above? 




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