[GitHub] spark issue #16255: [SPARK-18609][SQL]Fix when CTE with Join between two tab...

[windpiger]

Github user windpiger commented on the issue:

    https://github.com/apache/spark/pull/16255
  
    ok, the optimizer rule apply as follows:
    
    1. before optimizer:
    
    > Project [col#7 AS c1#4, col#10 AS c2#5]
    +- Join Cross
       :- Project [col#6 AS col#7]
       :  +- Join Cross
       :     :- MetastoreRelation default, p1
       :     +- Project [col#9 AS col#6]
       :        +- MetastoreRelation default, p2
       +- Project [col#6 AS col#10]
          +- Join Cross
             :- MetastoreRelation default, p1
             +- Project [col#9 AS col#6]
                +- MetastoreRelation default, p2
    
    
    2. after first ColumnPruning: 
    >Project [col#7 AS c1#4, col#10 AS c2#5]
    +- Join Cross
       :- Project [col#6 AS col#7]
       :  +- Join Cross
       :     :- Project
       :     :  +- MetastoreRelation default, p1
       :     +- Project [col#9 AS col#6]
       :        +- MetastoreRelation default, p2
       +- Project [col#6 AS col#10]
          +- Join Cross
             :- Project
             :  +- MetastoreRelation default, p1
             +- Project [col#9 AS col#6]
                +- MetastoreRelation default, p2
    
    3. after first RemoveAliasOnlyProject:
    >Project [col#6 AS c1#4, col#10 AS c2#5]
    +- Join Cross
       :- Join Cross
       :  :- Project
       :  :  +- MetastoreRelation default, p1
       :  +- Project [col#9 AS col#6]
       :     +- MetastoreRelation default, p2
       +- Project [col#6 AS col#10]
          +- Join Cross
             :- Project
             :  +- MetastoreRelation default, p1
             +- Project [col#9 AS col#6]
                +- MetastoreRelation default, p2
    `
    
    4. after second ColumnPruning:
    >Project [col#6 AS c1#4, col#10 AS c2#5]
    +- Join Cross
       :- Join Cross
       :  :- Project
       :  :  +- MetastoreRelation default, p1
       :  +- Project [col#9 AS col#6]
       :     +- MetastoreRelation default, p2
       +- Project [col#6 AS col#10]
          +- Join Cross
             :- Project
             :  +- MetastoreRelation default, p1
             +- Project [col#9 AS col#6]
                +- MetastoreRelation default, p2
    
    5. after second RemoveAliasOnlyProject:
    >Project [col#9 AS c1#4, col#10 AS c2#5]
    +- Join Cross
       :- Join Cross
       :  :- Project
       :  :  +- MetastoreRelation default, p1
       :  +- MetastoreRelation default, p2
       +- !Project [col#9 AS col#10]
          +- Join Cross
             :- Project
             :  +- MetastoreRelation default, p1
             +- Project [col#9 AS col#6]
                +- MetastoreRelation default, p2
    
    6. after third ColumnPruning:
    >Project [col#9 AS c1#4, col#10 AS c2#5]
    +- Join Cross
       :- Join Cross
       :  :- Project
       :  :  +- MetastoreRelation default, p1
       :  +- MetastoreRelation default, p2
       +- !Project [col#9 AS col#10]
          +- Join Cross
             :- Project
             :  +- MetastoreRelation default, p1
             +- Project
                +- Project
                   +- MetastoreRelation default, p2
    
    **here**
    >   +- !Project [col#9 AS col#10]
          +- Join Cross
             :- Project
             :  +- MetastoreRelation default, p1
             +- Project
                +- Project
                   +- MetastoreRelation default, p2
    
    **col#9 has no attribute to bind when do BindRefference**
    
    7. after CollapseProject:
    >Project [col#9 AS c1#4, col#10 AS c2#5]
    +- Join Cross
       :- Join Cross
       :  :- Project
       :  :  +- MetastoreRelation default, p1
       :  +- MetastoreRelation default, p2
       +- !Project [col#9 AS col#10]
          +- Join Cross
             :- Project
             :  +- MetastoreRelation default, p1
             +- Project
                +- MetastoreRelation default, p2
    
    8. when optimizer finished, the logic plan is 
    >Project [col#9 AS c1#4, col#10 AS c2#5]
    +- Join Cross
       :- Join Cross
       :  :- Project
       :  :  +- MetastoreRelation default, p1
       :  +- MetastoreRelation default, p2
       +- !Project [col#9 AS col#10]
          +- Join Cross
             :- Project
             :  +- MetastoreRelation default, p1
             +- Project
                +- MetastoreRelation default, p2
    `



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