[jira] [Created] (CALCITE-1586) wrong rel-to-sql conversion when performing set operation more then two inputs.

[Zhiqiang He (JIRA)]

Zhiqiang He created CALCITE-1586:
------------------------------------

             Summary: wrong rel-to-sql conversion when performing set operation 
more then two inputs.
                 Key: CALCITE-1586
                 URL: https://issues.apache.org/jira/browse/CALCITE-1586
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.10.0
         Environment: NA
            Reporter: Zhiqiang He
            Assignee: Julian Hyde
            Priority: Critical



in union example, after UnionMergeRule, the union input is convert to three 
input, and rel to sql convert result is wrong.

inputsql
 
 SELECT *
FROM (SELECT \"product_id\"
FROM \"foodmart\".\"product\"
UNION ALL
SELECT \"product_id\"
FROM \"foodmart\".\"sales_fact_1997\")
UNION ALL
SELECT \"product_class_id\" AS \"PRODUCT_ID\"
FROM \"foodmart\".\"product_class\"

output sql

SELECT \"product_id\"
FROM \"foodmart\".\"product\"
UNION ALL
SELECT \"product_id\"
FROM \"foodmart\".\"sales_fact_199

on union query is lost.




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