cloud-fan commented on code in PR #40058:
URL: https://github.com/apache/spark/pull/40058#discussion_r1111668719
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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2Strategy.scala:
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@@ -329,10 +329,17 @@ class DataSourceV2Strategy(session: SparkSession) extends
Strategy with Predicat
}
DescribeTableExec(output, r.table, isExtended) :: Nil
- case DescribeColumn(_: ResolvedTable, column, isExtended, output) =>
+ case DescribeColumn(r: ResolvedTable, column, isExtended, output) =>
column match {
case c: Attribute =>
- DescribeColumnExec(output, c, isExtended) :: Nil
+ val colStats =
+
r.table.asReadable.newScanBuilder(CaseInsensitiveStringMap.empty()).build()
match {
Review Comment:
this may not be very cheap. Shall we only do it if `isExtended` is true?
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