leanken commented on a change in pull request #29104:
URL: https://github.com/apache/spark/pull/29104#discussion_r460273465
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
##########
@@ -896,22 +969,32 @@ private[joins] object LongHashedRelation {
// Create a mapping of key -> rows
var numFields = 0
+ val isOriginalInputEmpty: Boolean = !input.hasNext
+ var allNullColumnKeyExistsInOriginalInput: Boolean = false
while (input.hasNext) {
val unsafeRow = input.next().asInstanceOf[UnsafeRow]
numFields = unsafeRow.numFields()
val rowKey = keyGenerator(unsafeRow)
if (!rowKey.isNullAt(0)) {
+ // LongToUnsafeRowMap can't insert null key
val key = rowKey.getLong(0)
map.append(key, unsafeRow)
+ } else if (!allNullColumnKeyExistsInOriginalInput) {
Review comment:
I can't change
```
if (!rowKey.isNullAt(0))
into
if (isNullAware || !rowKey.isNullAt(0))
because even if isNullAware = true, i still can't insert a null key into
LongToUnsafeRowMap
```
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