Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6911#discussion_r32972053
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/UnsafeRowConverter.scala
---
@@ -72,6 +70,19 @@ class UnsafeRowConverter(fieldTypes: Array[DataType]) {
*/
def writeRow(row: InternalRow, baseObject: Object, baseOffset: Long):
Int = {
unsafeRow.pointTo(baseObject, baseOffset, writers.length, null)
+
+ if (writers.length > 0) {
--- End diff --
Is it possible to declare a row which has no columns? I'm just wondering
if we ever run into a case where we need to worry about `writers.length == 0`
and whether we might also allocate bitset space in that case due to rounding or
something.
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