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starocean999 d39bca5ec7 [fix](nereids) don't build cte producer if the consumer is empty relation (#21317 )

explain WITH cte_0 AS ( SELECT 1 AS a ) SELECT * from cte_0 t1 join cte_0 t2 on true WHERE false;
before:
```
+----------------------------+
| Explain String             |
+----------------------------+
| PLAN FRAGMENT 0            |
|   OUTPUT EXPRS:            |
|     a[#1]                  |
|     a[#2]                  |
|   PARTITION: UNPARTITIONED |
|                            |
|   VRESULT SINK             |
|                            |
|   1:VEMPTYSET              |
|                            |
| PLAN FRAGMENT 1            |
|   OUTPUT EXPRS:            |
|     a[#0]                  |
|   PARTITION: UNPARTITIONED |
|                            |
|   MultiCastDataSinks       |
|                            |
|   0:VUNION                 |
|      constant exprs:       |
|          1                 |
+----------------------------+
```
after:

```
+----------------------------+
| Explain String             |
+----------------------------+
| PLAN FRAGMENT 0            |
|   OUTPUT EXPRS:            |
|     a[#0]                  |
|     a[#1]                  |
|   PARTITION: UNPARTITIONED |
|                            |
|   VRESULT SINK             |
|                            |
|   0:VEMPTYSET              |
+----------------------------+
```

2023-07-07 18:12:28 +08:00