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https://issues.apache.org/jira/browse/FLINK-20887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17322879#comment-17322879
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Flink Jira Bot commented on FLINK-20887:
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This issue is assigned but has not received an update in 7 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> Non-deterministic functions return different values even if it is referred
> with the same column name
> ----------------------------------------------------------------------------------------------------
>
> Key: FLINK-20887
> URL: https://issues.apache.org/jira/browse/FLINK-20887
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.13.0
> Reporter: Caizhi Weng
> Assignee: Caizhi Weng
> Priority: Major
> Labels: stale-assigned
>
> Add the following test case to {{CalcITCase.scala}}
> {code:scala}
> @Test
> def testRand(): Unit = {
> checkResult(
> s"""
> |SELECT b - a FROM (
> | SELECT r + 5 AS a, r + 7 AS b FROM (
> | SELECT RAND() AS r FROM SmallTable3
> | ) t1
> |) t2
> |""".stripMargin,
> Seq(row(2), row(2), row(2))
> )
> }
> {code}
> Failure messages are
> {code}
> Results
> == Correct Result - 3 == == Actual Result - 3 ==
> !2 1.051329250417921
> !2 1.3649146677814379
> !2 1.787784536771345
>
> Plan:
> == Abstract Syntax Tree ==
> LogicalProject(EXPR$0=[-($1, $0)])
> +- LogicalProject(a=[+($0, 5)], b=[+($0, 7)])
> +- LogicalProject(r=[RAND()])
> +- LogicalTableScan(table=[[default_catalog, default_database,
> SmallTable3]])
> == Optimized Logical Plan ==
> Calc(select=[-(+(RAND(), 7), +(RAND(), 5)) AS EXPR$0])
> +- BoundedStreamScan(table=[[default_catalog, default_database,
> SmallTable3]], fields=[a, b, c])
> {code}
> It seems that the projections are merged incorrectly. However if you run the
> following test case in {{FlinkCalcMergeRuleTest.scala}}
> {code:scala}
> @Test
> def testCalcMergeWithRandomUdf(): Unit = {
> val sqlQuery = "SELECT ts + a, ts + b FROM " +
> "(SELECT a, b, random_udf(a) AS ts FROM MyTable WHERE a = b) t"
> util.verifyRelPlan(sqlQuery)
> }
> {code}
> The result is
> {code:xml}
> <Root>
> <TestCase name="testCalcMergeWithRandomUdf">
> <Resource name="sql">
> <![CDATA[SELECT ts + a, ts + b FROM (SELECT a, b, random_udf(a) AS ts
> FROM MyTable WHERE a = b) t]]>
> </Resource>
> <Resource name="ast">
> <![CDATA[
> LogicalProject(EXPR$0=[+(random_udf($0), $0)], EXPR$1=[+(random_udf($0), $1)])
> +- LogicalFilter(condition=[=($0, $1)])
> +- LogicalTableScan(table=[[default_catalog, default_database, MyTable,
> source: [TestTableSource(a, b, c)]]])
> ]]>
> </Resource>
> <Resource name="optimized rel plan">
> <![CDATA[
> FlinkLogicalCalc(select=[+(random_udf(a), a) AS EXPR$0, +(random_udf(a), b)
> AS EXPR$1], where=[=(a, b)])
> +- FlinkLogicalLegacyTableSourceScan(table=[[default_catalog,
> default_database, MyTable, source: [TestTableSource(a, b, c)]]], fields=[a,
> b, c])
> ]]>
> </Resource>
> </TestCase>
> </Root>
> {code}
> It seems that the plan is incorrect from the AST. So this seems to be a bug
> in Calcite?
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