Github user viirya commented on a diff in the pull request:
    --- Diff: 
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
    @@ -262,7 +262,7 @@ ctes
    -    : name=identifier AS? '(' queryNoWith ')'
    +    : name=identifier AS? '(' query ')'
    --- End diff --
    Currently we only allow a query without `With` used in the CTE's named 
query. This change loose this limit to allow a query with `With` to be a named 
query. So we can define CTE in CTE subquery.

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