dongjoon-hyun commented on a change in pull request #31336:
URL: https://github.com/apache/spark/pull/31336#discussion_r564215741
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -3957,13 +3957,16 @@ object ApplyCharTypePadding extends Rule[LogicalPlan] {
if attr.dataType == StringType && list.forall(_.foldable) =>
CharVarcharUtils.getRawType(attr.metadata).flatMap {
case CharType(length) =>
- val literalCharLengths =
list.map(_.eval().asInstanceOf[UTF8String].numChars())
- val targetLen = (length +: literalCharLengths).max
- Some(i.copy(
- value = addPadding(attr, length, targetLen),
- list = list.zip(literalCharLengths).map {
- case (lit, charLength) => addPadding(lit, charLength,
targetLen)
- }))
+ val (nulls, literalChars) =
+ list.map(_.eval().asInstanceOf[UTF8String]).partition(_ ==
null)
+ val literalCharLengths = literalChars.map(_.numChars())
+ val targetLen = literalCharLengths.fold(length)(_ max _)
+
+ val newAttr = addPadding(attr, length, targetLen)
+ val newList = list.zip(literalCharLengths).map {
Review comment:
Is this change required?
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