c73f70bb0d
### What changes were proposed in this pull request?
Rewrote one `ExtractGenerator` case such that it would not rely on a side effect of the flatmap function.
### Why are the changes needed?
With the dataframe api it is possible to have a lazy sequence as the `output` of a `LogicalPlan`. When exploding a column on this dataframe using the `withColumn("newName", explode(col("name")))` method, the `ExtractGenerator` does not extract the generator and `CheckAnalysis` would throw an exception.
### Does this PR introduce _any_ user-facing change?
Bugfix
Before this, the work around was to put `.select("*")` before the explode.
### How was this patch tested?
UT
Closes #31213 from tanelk/SPARK-34141_extract_generator.
Authored-by: tanel.kiis@gmail.com <tanel.kiis@gmail.com>
Signed-off-by: Sean Owen <srowen@gmail.com>
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