cloud-fan commented on a change in pull request #31993:
URL: https://github.com/apache/spark/pull/31993#discussion_r617276236
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SchemaPruning.scala
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@@ -21,9 +21,12 @@ 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.
- * Note that schema field ordering at original schema is still preserved in
pruned schema.
+ * Prunes the nested schema by the requested fields. For example, if the
schema is:
+ * `id int, struct<a:int, b:int>`, and given requested field are "a", the
field "b" is pruned
Review comment:
`and given requested field are "a"` -> `and given requested field "s.a"`
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