strongduanmu commented on issue #21420:
URL:
https://github.com/apache/shardingsphere/issues/21420#issuecomment-1272482476
When I execute `SELECT * FROM t_order EXCEPT SELECT * FROM t_order;`, a
similar exception occurs.
```
ERROR: There are not enough rules to produce a node with desired
properties: convention=ENUMERABLE, sort=[].
Missing conversion is LogicalMinus[convention: NONE -> ENUMERABLE]
There is 1 empty subset: rel#2618:RelSubset#1.ENUMERABLE.[], the relevant
part of the original plan is as follows
2616:LogicalMinus(all=[false])
2599:LogicalTableScan(subset=[rel#2615:RelSubset#0.NONE.[]],
table=[[public, t_order]])
2599:LogicalTableScan(subset=[rel#2615:RelSubset#0.NONE.[]],
table=[[public, t_order]])
Root: rel#2618:RelSubset#1.ENUMERABLE.[]
Original rel:
LogicalMinus(subset=[rel#2618:RelSubset#1.ENUMERABLE.[]], all=[false]):
rowcount = 100.0, cumulative cost = {100.0 rows, 100.0 cpu, 0.0 io}, id = 2616
LogicalTableScan(subset=[rel#2615:RelSubset#0.NONE.[]], table=[[public,
t_order]]): rowcount = 100.0, cumulative cost = {100.0 rows, 101.0 cpu, 0.0
io}, id = 2599
LogicalTableScan(subset=[rel#2615:RelSubset#0.NONE.[]], table=[[public,
t_order]]): rowcount = 100.0, cumulative cost = {100.0 rows, 101.0 cpu, 0.0
io}, id = 2599
```
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