Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/19831
> Besides, if the size stats totalSize or rawDataSize is wrong, the problem
exists whether CBO is enabled or not.
> If CBO enabled, the outputRowCount == 0, the getOutputSize is 1,
sizeInBytes is 1 and this side can broadcast:
If CBO disabled, the sizeInBytes = (p.child.stats.sizeInBytes *
outputRowSize) / childRowSize and this side cann't broadcast:
@wangyum `totalSize or rawDataSize` can also be wrong, right?
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