xudong963 commented on pull request #1639:
URL: 
https://github.com/apache/arrow-datafusion/pull/1639#issuecomment-1019091358


   It is a unreasonable behavior that a single cte block with the same name for 
many times. But currently, datafusion doesn't process it correctly.
   
   ```sql
   // datafusion
   ❯ create table t1  as select '123' as c;
   0 rows in set. Query took 0.005 seconds.
   ❯ create table t3  as select '12' as c;
   0 rows in set. Query took 0.005 seconds.
   ❯ with a as (select * from t1), a as (select * from t3) select * from a;
   +----+
   | c  |
   +----+
   | 12 |
   +----+
   1 row in set. Query took 0.007 seconds.
   
   //postgres
   postgres=# with a as (select * from t1), a as (select * from t2) select * 
from a;
   ERROR:  WITH query name "a" specified more than once
   LINE 1: with a as (select * from t1), a as (select * from t2) select...
   ```


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