Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14132
The difference of JOIN[5] and JOIN[5] is just due to the following.
* JOIN[5]
```
TableScan
alias: t1
Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE
Column stats: NONE
Select Operator
expressions: a (type: int)
outputColumnNames: _col0
Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE
Column stats: NONE
Reduce Output Operator
sort order:
Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE
Column stats: NONE
value expressions: _col0 (type: int)
```
* JOIN[5]
```
TableScan
alias: t1
Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE
Column stats: NONE
Reduce Output Operator
sort order:
Statistics: Num rows: 1 Data size: 1 Basic stats: COMPLETE
Column stats: NONE
value expressions: a (type: int)
```
For Query 3 and 4, `t1` -> `t2` and `a` -> `b`.
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