[jira] [Created] (CALCITE-2249) AggregateJoinTransposeRule generates inequivalent nodes if Aggregate relNode contains distinct aggregate function.

["jingzhang (JIRA)" <ji...@apache.org>]

jingzhang created CALCITE-2249:
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             Summary: AggregateJoinTransposeRule generates inequivalent nodes if Aggregate relNode contains distinct aggregate function.
                 Key: CALCITE-2249
                 URL: https://issues.apache.org/jira/browse/CALCITE-2249
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: jingzhang
            Assignee: Julian Hyde


AggregateJoinTransposeRule generates inequivalent nodes if Aggregate relNode contains distinct aggregate function.

T1
||a (String)||b (int)||
|A|1|
|A|2|
|B|2|
|C|3|

 

T2
||c(int)||
|1|
|1|
|2|

For the following sql, 

${code}

select count (distinct a) from t1, t2 where t1.b = t2.c

${code}

Aggregate would generate following node tree, which is inequivalent with original node tree.

${code}

LogicalAggregate(group=[{}], EXPR$0=[$SUM0($4)])
+- LogicalProject(b=[$0], EXPR$0=[$1], c=[$2], $f1=[$3], $f4=[*($1, $3)])
 +- LogicalJoin(condition=[=($0, $2)], joinType=[inner])
 :- LogicalAggregate(group=[\{1}], EXPR$0=[COUNT(DISTINCT $0)])
 : +- LogicalTableScan(table=[[t1]])
 +- LogicalAggregate(group=[\{0}], agg#0=[COUNT()])
 +- LogicalTableScan(table=[[t2]])

${code}

Based on the converted plan, result is 4; while the correct answer is 2.



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