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Posted to github@arrow.apache.org by "my-vegetable-has-exploded (via GitHub)" <gi...@apache.org> on 2023/12/18 07:14:03 UTC
[I] Support cast between StructArray. [arrow-rs]
my-vegetable-has-exploded opened a new issue, #5219:
URL: https://github.com/apache/arrow-rs/issues/5219
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
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In https://github.com/apache/arrow-datafusion/issues/6635, we think supporting cast between StructArray will be helpful to implement multi column In list.
For example,
```
❯ CREATE TABLE colors (
color_id INT PRIMARY KEY,
color_name VARCHAR(50)
);
0 rows in set. Query took 0.002 seconds.
❯ INSERT INTO colors (color_id, color_name) VALUES (1, 'Red'), (2, 'Blue');
+-------+
| count |
+-------+
| 2 |
+-------+
1 row in set. Query took 0.002 seconds.
❯ SELECT * FROM colors WHERE struct(color_id) IN (struct(1));
type_coercion
caused by
Error during planning: Can not find compatible types to compare Struct([Field { name: "c0", data_type: Int32, nullable: true, dict_id: 0, dict_is_ordered: false, metadata: {} }]) with [Struct([Field { name: "c0", data_type: Int64, nullable: true, dict_id: 0, dict_is_ordered: false, metadata: {} }])]
```
After supporting cast between StructArray, we can just use ```struct(color_id) IN (struct(1))``` rather than ```struct(color_id) IN (struct(arrow_cast(1,'Int32')));``` in this example.
**Describe the solution you'd like**
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- check can_cast_types recursively for each field
- cast_with_options recursively for each field
**Describe alternatives you've considered**
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**Additional context**
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I'm willing to submit a pr later.
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Re: [I] Support cast between StructArray. [arrow-rs]
Posted by "tustvold (via GitHub)" <gi...@apache.org>.
tustvold commented on issue #5219:
URL: https://github.com/apache/arrow-rs/issues/5219#issuecomment-1878523832
`label_issue.py` automatically added labels {'arrow'} from #5221
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Re: [I] Support cast between StructArray. [arrow-rs]
Posted by "tustvold (via GitHub)" <gi...@apache.org>.
tustvold closed issue #5219: Support cast between StructArray.
URL: https://github.com/apache/arrow-rs/issues/5219
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