[jira] [Created] (CALCITE-4921) Nested NATURAL JOINs or JOINs with USING can't find common column

["Aleksey Plekhanov (Jira)" <ji...@apache.org>]

Aleksey Plekhanov created CALCITE-4921:
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             Summary: Nested NATURAL JOINs or JOINs with USING can't find common column
                 Key: CALCITE-4921
                 URL: https://issues.apache.org/jira/browse/CALCITE-4921
             Project: Calcite
          Issue Type: Bug
            Reporter: Aleksey Plekhanov


{{SqlValidatorUtil#deriveNaturalJoinColumnList}} can't correctly derive common columns for JOIN if the left hand of it is another NATURAL JOIN or JOIN with USING. For example:
{noformat}
SELECT * FROM (values (1, 1)) as t1(a, b)
NATURAL JOIN (values (1, 1)) as t2(a, c)
NATURAL JOIN (values (1, 1)) as t3(a, d){noformat}
Builds incorrect plan:
{noformat}
LogicalProject(A=[$0], B=[$1], C=[$3], A1=[$4], D=[$5])
  LogicalJoin(condition=[true], joinType=[inner])
    LogicalJoin(condition=[=($0, $2)], joinType=[inner])
      LogicalValues(tuples=[[{ 1, 1 }]])
      LogicalValues(tuples=[[{ 1, 1 }]])
    LogicalValues(tuples=[[{ 1, 1 }]]){noformat}
Queries with USING also have problems:
{noformat}
SELECT * FROM (values (1, 1)) as t1(a, b)
JOIN (values (1, 1)) as t2(a, c) USING (a)
JOIN (values (1, 1)) as t3(a, d) USING (a){noformat}
Fails with:
{noformat}
Column name 'A' in USING clause is not unique on one side of join{noformat}



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