ueshin opened a new pull request, #43519:
URL: https://github.com/apache/spark/pull/43519
### What changes were proposed in this pull request?
Fixes observation when named observations with the same name on different
datasets.
### Why are the changes needed?
Currently if there are observations with the same name on different dataset,
one of them will be overwritten by the other execution.
For example,
```py
>>> observation1 = Observation("named")
>>> df1 = spark.range(50)
>>> observed_df1 = df1.observe(observation1, count(lit(1)).alias("cnt"))
>>>
>>> observation2 = Observation("named")
>>> df2 = spark.range(100)
>>> observed_df2 = df2.observe(observation2, count(lit(1)).alias("cnt"))
>>>
>>> observed_df1.collect()
...
>>> observed_df2.collect()
...
>>> observation1.get
{'cnt': 50}
>>> observation2.get
{'cnt': 50}
```
`observation2` should return `{'cnt': 100}`.
### Does this PR introduce _any_ user-facing change?
Yes, the observations with the same name will be available if they observe
different datasets.
### How was this patch tested?
Added the related tests.
### Was this patch authored or co-authored using generative AI tooling?
No.
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