cloud-fan commented on a change in pull request #31993:
URL: https://github.com/apache/spark/pull/31993#discussion_r614089538
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SchemaPruning.scala
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@@ -21,8 +21,9 @@ import org.apache.spark.sql.types._
object SchemaPruning {
/**
- * Filters the schema by the requested fields. For example, if the schema is
struct<a:int, b:int>,
- * and given requested field are "a", the field "b" is pruned in the
returned schema.
+ * Prunes the nested schema by the requested fields. For example, if the
schema is
+ * struct<a:int, b:int>, and given requested field are "a", the field "b" is
pruned in the
+ * returned schema.
Review comment:
let's call it out explicitly that the top-level fields are not pruned
here.
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