HyukjinKwon commented on a change in pull request #29942:
URL: https://github.com/apache/spark/pull/29942#discussion_r499440791
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/OptimizeJsonExprs.scala
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@@ -28,10 +28,43 @@ import org.apache.spark.sql.types.{ArrayType, StructType}
* The optimization includes:
* 1. JsonToStructs(StructsToJson(child)) => child.
* 2. Prune unnecessary columns from GetStructField/GetArrayStructFields +
JsonToStructs.
+ * 3. struct(from_json.col1, from_json.col2, from_json.col3...) =>
struct(from_json)
Review comment:
It's a nit but can we match the comment style? 1. and 2. used the
expression class names but 3. used function-ish name.
BTW, `sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst` is a
private package that doesn't generate Javadoc. So it should be safe to use
`[[...]]` as we want (because using `[[...]]` in Scaladoc causes some problems
sometimes when it's converted into Javadoc in some cases such as `trait`s).
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