Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7840#discussion_r36056858
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -127,6 +127,8 @@ class CodeGenContext {
dataType match {
case _ if isPrimitiveType(jt) =>
s"$row.set${primitiveTypeName(jt)}($ordinal, $value)"
case t: DecimalType => s"$row.setDecimal($ordinal, $value,
${t.precision})"
+ // The UTF8String may came from UnsafeRow, otherwise clone is cheap
(re-use the bytes)
+ case StringType => s"$row.update($ordinal, $value.clone())"
--- End diff --
Because we don't copy the bytes in UnsafeRow.getString(), to have better
performance.
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