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[SPARK-22862] Docs on lazy elimination of columns missing from an encoder #20048

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[SPARK-22862] Docs on lazy elimination of columns missing from an encoder #20048

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4 changes: 4 additions & 0 deletions sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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Expand Up @@ -401,6 +401,10 @@ class Dataset[T] private[sql](
* If the schema of the Dataset does not match the desired `U` type, you can use `select`
* along with `alias` or `as` to rearrange or rename as required.
*
* Note that `as[]` only changes the view of the data that is passed into typed operations,
* such as `map()`, and does not eagerly project away any columns that are not present in
* the specified class.
*
* @group basic
* @since 1.6.0
*/
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