cloud-fan commented on a change in pull request #33146:
URL: https://github.com/apache/spark/pull/33146#discussion_r661458691
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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@@ -406,19 +406,21 @@ abstract class CastBase extends UnaryExpression with
TimeZoneAwareExpression wit
if (row.numFields > 0) {
val st = fields.map(_.dataType)
val toUTF8StringFuncs = st.map(castToString)
- if (row.isNullAt(0)) {
+ if (fields(0).nullable && row.isNullAt(0)) {
Review comment:
if `fields(0).nullable` is false, how can `row.isNullAt(0)` be true?
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