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https://issues.apache.org/jira/browse/CALCITE-6218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17811644#comment-17811644
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EveyWu commented on CALCITE-6218:
----------------------------------
[~MasseGuillaume] I submitted a PR to solve the problem of "xs0" not exists。
I also think there can be more improvements here，correlated lateral join can be
handled directly instead of a lot of rewrites.
> RelToSqlConverter fails to convert correlated lateral joins
> -----------------------------------------------------------
>
> Key: CALCITE-6218
> URL: https://issues.apache.org/jira/browse/CALCITE-6218
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.36.0
> Reporter: Guillaume Massé
> Priority: Major
> Labels: pull-request-available
>
>
> input query:
> {code:sql}
> SELECT
> "a", "x"
> FROM
> "myDb"."myTable",
> unnest("xs") as "x"; {code}
> schema:
> [https://github.com/MasseGuillaume/calcite/blob/0126e6cfa47061886b2012ad2d2c32408455ae88/testkit/src/main/java/org/apache/calcite/test/CalciteAssert.java#L2180-L2211]
> {code:java}
> myTable(
> a: BIGINT,
> // ...
> xs: ARRAY<BIGINT>,
> // ...
> )
> {code}
> logical plan:
> {code:java}
> LogicalProject(a=[$0], x=[$6])
> LogicalCorrelate(correlation=[$cor0], joinType=[inner],
> requiredColumns=[{4}])
> LogicalProject(a=[$0], b=[$1.n11.b], c=[$1.n12.c], d=[$2.d], xs=[$3],
> e=[$4])
> LogicalTableScan(table=[[myDb, myTable]])
> Uncollect
> LogicalProject(xs=[$cor0.xs])
> LogicalValues(tuples=[[{ 0 }]])
> {code}
> obtained sql:
>
> {code:sql}
> SELECT
> "$cor0"."a",
> "$cor0"."xs0" AS "x" -- <-- xs0 ?
> FROM
> (
> SELECT "a", "n1"."n11"."b", "n1"."n12"."c", "n2"."d", "xs", "e" FROM
> "myDb"."myTable"
> ) AS "$cor0",
> LATERAL UNNEST (
> SELECT "$cor0"."xs" FROM (VALUES (0)) AS "t" ("ZERO")
> ) AS "t1" ("xs") AS "t10"
> {code}
> I would expect the query to be converted to something close to the original
> query. Here "xs0" does not exists.
>
> [https://github.com/MasseGuillaume/calcite/commit/0126e6cfa47061886b2012ad2d2c32408455ae88]
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