autophagy opened a new pull request, #26403:
URL: https://github.com/apache/flink/pull/26403
## What is the purpose of the change
If you call `TableEnvironment.from_elements` where one of the fields in the
row contains a `Row, for example where one of the values you pass in is:
```
[
Row("pyflink1A", "pyflink2A", "pyflink3A"),
Row("pyflink1B", "pyflink2B", "pyflink3B"),
Row("pyflink1C", "pyflink2C", "pyflink3C"),
],
```
where the schema for the field is:
```
DataTypes.ARRAY(
DataTypes.ROW(
[
DataTypes.FIELD("a", DataTypes.STRING()),
DataTypes.FIELD("b", DataTypes.STRING()),
DataTypes.FIELD("c", DataTypes.STRING()),
]
)
),
```
When you call `execute().collect()` on the table, the array is returned as:
```
[
<Row(['pyflink1a', 'pyflink2a', 'pyflink3a'])>,
<Row(['pyflink1b', 'pyflink2b', 'pyflink3b'])>,
<Row(['pyflink1c', 'pyflink2c', 'pyflink3c'])>
]
```
Instead of each `Row` having 3 values, the collected row only has 1 value,
which is now a list of the actual values in the row. The input and output rows
are no longer equal (as their internal `_values` collection are no longer
equal, one being a list of strings and the other being a list of a list of
strings). The `len()` of the source Row is correctly returned as 3, but the
collected row incorrectly reports a `len()` of 1.
The constructor for `Row` is such that it takes an arbitrary number of
parameters as values, so that:
```
Row("hello", "world', 1, 2, 3, ["hello", "world"])
```
Produces a `Row` whose internal `_values` would be a list of those values:
`["hello", "world", 1, 2, 3, ["hello", "world"]`
The `pickled_bytes_to_python_converter` builds a list of fields from the
pickled bytes, but then passes this list to the `Row` constructor as one,
single argument - essentially constructing the Row with just one field (when it
should have all the fields that were collected). This list of fields should be
unpacked with `*` when passing them into the `Row` constructor, such that each
field acts as a parameter to the constructor.
## Brief change log
- *Fixed issue when converting a pickled row field to a `Row` type during
collection.*
## Verifying this change
This change added tests and can be verified as follows:
*(example:)*
- *Modified existing
`StreamTableEnvironmentTests.test_collect_for_all_data_types` test to properly
construct source `Row`s, and to check that the `Row`s returned from
`execute().collect()` have the same internal structure as the source `Row`s.*
-
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (*no*)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (*maybe?*)
- The serializers: (*no*)
- The runtime per-record code paths (performance sensitive): (*no*)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (*no*)
- The S3 file system connector: (*no*)
## Documentation
- Does this pull request introduce a new feature? (*no*)
- If yes, how is the feature documented? (*not applicable*)
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