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[C++] Refactor Buffers method on concatenate to consolidate code.

4

See https://github.com/apache/arrow/pull/4498/files for reference. **Reporter**: [Micah Kornfield](https://issues.apache.org/jira/browse/ARROW-5550) / @emkornfield **Note**: *This issue was originally created as [ARROW-5550](https://issues.apache.org/jira/browse/ARROW-5550). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*

[Python] Allow parsing more general JSON formats

2

I have JSON data where the columnar (line-delimited) part is in a `data` subkey: ```java { "metadata": {"name": "block1"}, "data" : [ {"a": 1, "b": 2.0, "c": "foo", "d": false},...

[C++] Improve clang-tidy speed

2

See https://github.com/apache/arrow/pull/4293#issuecomment-501950675 **Reporter**: [Francois Saint-Jacques](https://issues.apache.org/jira/browse/ARROW-5611) / @fsaintjacques **Note**: *This issue was originally created as [ARROW-5611](https://issues.apache.org/jira/browse/ARROW-5611). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*

[C++][Gandiva] Expression cache should not use ToString on data type

1

The expression cache in gandiva generates uses the ToString() method of arrow::DataType() for both hashing and equality. This is error-prone - we should have a visitor for generating hash, and...

[Crossbow] Support GitLab runners

5

Description is by @kou: I want to use GitLab Runner instead of CircleCI. Because we can add custom GitLab Runners for us. For example, we can add GPU enabled GitLab...

[R] Improve autosplice cpp code

1

Followup to ARROW-5178. See discussion on .  **Reporter**: [Neal Richardson](https://issues.apache.org/jira/browse/ARROW-5761) / @nealrichardson **Note**: *This issue was originally created as [ARROW-5761](https://issues.apache.org/jira/browse/ARROW-5761). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*

[C++] CSV reader: Ability to not infer column types.

9

I'm trying to read CSV as is. All columns as strings. I don't know the schema of these CSVs and they will vary as they are provided by user. Right...

[Python] Exceptions swallowed in ParquetManifest._visit_directories

10

`ParquetManifest._visit_directories` uses a `ThreadPoolExecutor` to visit partitioned parquet datasets concurrently, it waits for them to finish but doesn't check if the respective futures have failed or not. This is quite...

[Doc] Better document the Tensor classes in the prose documentation

1

From a comment from @wesm in ARROW-2714: > The Tensor classes are independent from the columnar data structures, though they reuse pieces of metadata, metadata serialization, memory management, and IPC....

[Python] Support optional arrow components via extras_require

3

Since Arrow (and pyarrow) have several independent optional component, instead of installing all of them it would be convenient if these could be opt-in from pip like  `pip install pyarrow[gandiva,flight,plasma]`...