bersprockets commented on code in PR #38923:
URL: https://github.com/apache/spark/pull/38923#discussion_r1041454229
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/InterpretedMutableProjection.scala:
##########
@@ -67,6 +69,7 @@ class InterpretedMutableProjection(expressions:
Seq[Expression]) extends Mutable
validExprs.map(_._1.dataType).filterNot(UnsafeRow.isMutable)
.map(_.catalogString).mkString(", "))
mutableRow = row
+ unsafeMutableRow = if (mutableRow.isInstanceOf[UnsafeRow]) true else false;
Review Comment:
The generated code for `MutableProjection` doesn't seem to care about the
type of the target row. It just calls `setDecimal` for decimal null values
regardless of whether the target is an unsafe row or not:
```java
/* 092 */ // copy all the results into MutableRow
/* 093 */
/* 094 */ if (!isNull_6) {
/* 095 */ mutableRow.setDecimal(0, mutableStateArray_0[0], 27);
/* 096 */ } else {
/* 097 */ mutableRow.setDecimal(0, null, 27);
/* 098 */ }
```
So this code should probably also not care. I will make the change and test.
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