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https://issues.apache.org/jira/browse/CALCITE-4630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17355909#comment-17355909
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Julian Hyde commented on CALCITE-4630:
--------------------------------------
If the {{LIMIT}} were not present, I think it might be valid to push the filter
down (because of {{INNER}}). So, it's possible that the bug is that something
is failing to notice the {{LIMIT}}. It could be in {{FilterCorrelateRule}} as
[~zabetak] says, but the problem could also occur during SQL-to-Rel.
For what's worth, I'll also note that queries that have this pattern -
sub-query with {{ORDER}} ... {{DESC LIMIT 1}} - can also be mapped to {{MAX}}
with {{GROUP BY}} or {{MAX}} with a windowed aggregate. See CALCITE-1317 and
CALCITE-1757 ("WinMagic").
> Wrong logical plan for INNER JOIN with subquery
> -----------------------------------------------
>
> Key: CALCITE-4630
> URL: https://issues.apache.org/jira/browse/CALCITE-4630
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.26.0
> Reporter: Dmitry Sysolyatin
> Priority: Critical
>
> I tried to execute the following query:
> {code:sql}
> SELECT
> d.name,
> d.timestamp_ns
> FROM trucks t
> INNER JOIN LATERAL (
> SELECT
> name, timestamp_ns, fuel_state
> FROM
> trucks_diagnostics
> WHERE
> trucks_diagnostics.name = t.name
> ORDER BY timestamp_ns DESC
> LIMIT 1) d ON true WHERE t.fleet = 'South' AND d.fuel_state < 0.1
> {code}
> calcite generates me the following logical plan:
> {code:java}
> LogicalProject(name=[$8], timestamp_ns=[$9])
> LogicalCorrelate(correlation=[$cor0], joinType=[inner],
> requiredColumns=[{4}])
> LogicalFilter(condition=[=(CAST($6):VARCHAR, 'South')])
> DataTableScan
> LogicalFilter(condition=[<($2, 0.1:DECIMAL(2, 1))])
> LogicalSort(sort0=[$1], dir0=[DESC], fetch=[1])
> LogicalProject(name=[$4], timestamp_ns=[$0], fuel_state=[$1])
> LogicalFilter(condition=[=(CAST($4):VARCHAR,
> CAST($cor0.name):VARCHAR)])
> DataTableScan
> {code}
> But `LogicalFilter(condition=[<($2, 0.1:DECIMAL(2, 1))])` should not be
> inside LogicalCorrelate . It should be upper than LogicalCorrelate
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