cloud-fan commented on a change in pull request #31905:
URL: https://github.com/apache/spark/pull/31905#discussion_r602072774
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File path: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
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@@ -683,6 +683,12 @@ class SparkSession private(
ret
}
+ def observation(expr: Column, exprs: Column*): Observation =
Review comment:
It's a bit awkward to build an `Observation` with columns. The
`Observation` looks like can be used with different DataFrames, but it is not
because the columns are from a certain DataFrame.
How about this:
```
val observation = Observation("the name")
df1.observe(observation, expressions...)...
val res1 = observation.get
df2.observe(observation, expressions...)...
val res2 = observation.get
```
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