[GitHub] [arrow] westonpace commented on issue #35354: [Python][C++?] Dataset "right anti" join gives incorrect result with large_string columns (11.0.0)

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on issue #35354:
URL: https://github.com/apache/arrow/issues/35354#issuecomment-1536892668

   I can confirm this with a unit test.  I suspect we are overflowing something but I don't see any asan or ubsan violations so it'll take a bit more digging:
   
   ```
   TEST(HashJoin, LargeString) {
     LargeStringBuilder builder;
     ASSERT_OK(builder.Reserve(1030));
     for (int i = 0; i < 1030; i++) {
       ASSERT_OK(builder.Append(std::to_string(i)));
     }
     ASSERT_OK_AND_ASSIGN(auto arr, builder.Finish());
     ExecBatch batch({arr}, 1030);
     std::vector<ExecBatch> batches = {batch};
   
     Declaration left{"exec_batch_source", ExecBatchSourceNodeOptions(
                                               schema({field("x", large_utf8())}), batches)};
     Declaration right{
         "exec_batch_source",
         ExecBatchSourceNodeOptions(schema({field("x", large_utf8())}), batches)};
   
     HashJoinNodeOptions join_opts(JoinType::RIGHT_ANTI, {"x"}, {"x"});
     Declaration join{"hashjoin", {left, right}, join_opts};
   
     ASSERT_OK_AND_ASSIGN(std::shared_ptr<Table> result, DeclarationToTable(join));
     std::cout << result->ToString() << std::endl;
   }
   ```


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