ueshin opened a new pull request, #43469:
URL: https://github.com/apache/spark/pull/43469
### What changes were proposed in this pull request?
Apply the observed metrics to `Observation` object.
### Why are the changes needed?
When using `Observation`, the observed metrics should be applied to the
object.
For example, in vanilla PySpark:
```py
>>> df = spark.createDataFrame([["Alice", 2], ["Bob", 5]], ["name", "age"])
>>> observation = Observation("my metrics")
>>> observed_df = df.observe(observation, count(lit(1)).alias("count"),
max(col("age")))
>>> observed_df.count()
2
>>>
>>> observation.get
{'count': 2, 'max(age)': 5}
```
whereas in Spark Connect, currently it fails with
`PySparkNotImplementedError`:
```py
>>> observation.get
Traceback (most recent call last):
...
raise PySparkNotImplementedError(
pyspark.errors.exceptions.base.PySparkNotImplementedError: [NOT_IMPLEMENTED]
Observation support for Spark Connect is not implemented.
```
### Does this PR introduce _any_ user-facing change?
Yes, the `Observation` will see the changes.
### How was this patch tested?
Added/modified the related tests.
### Was this patch authored or co-authored using generative AI tooling?
No.
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