Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/7305#issuecomment-120813751
@maropu Probably this is incorrect.
`Explode` actually only accept single child expression, which should be
either in `ArrayType` or `MapType`, pass in a `Star` probably not correct in
semantics, particularly the `star` can be expanded into couple of expressions.
And in `Analyzer`, seems you simply transform the generator from `Explode`
into `UserDefinedGenerator` if it contains `star`, that's not an `explode` any
more.
From the unit test code, probably the SQL like below can achieve the same
purpose.
···
Seq(("1", "1,2"), ("2", "4"), ("3", "7,8,9")).toDF("prefix",
"csv").registerTempTable("table")
SELECT prefix, csv, concat(prefix, ':', r) FROM table LATERAL VIEW
explode(split(csv,',')) d as r
···
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