Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/2860#discussion_r19099520
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/columnar/ColumnStats.scala ---
@@ -24,11 +24,13 @@ import
org.apache.spark.sql.catalyst.expressions.{AttributeMap, Attribute, Attri
import org.apache.spark.sql.catalyst.types._
private[sql] class ColumnStatisticsSchema(a: Attribute) extends
Serializable {
- val upperBound = AttributeReference(a.name + ".upperBound", a.dataType,
nullable = false)()
- val lowerBound = AttributeReference(a.name + ".lowerBound", a.dataType,
nullable = false)()
- val nullCount = AttributeReference(a.name + ".nullCount", IntegerType,
nullable = false)()
+ val upperBound = AttributeReference(a.name + ".upperBound", a.dataType,
nullable = true)()
+ val lowerBound = AttributeReference(a.name + ".lowerBound", a.dataType,
nullable = true)()
--- End diff --
Upper/lower bound can be null for types like string.
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