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https://issues.apache.org/jira/browse/CALCITE-7846?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rodrigo Setti updated CALCITE-7846:
-----------------------------------
Attachment: calcite-one-column-set-op-repro.zip
> Set operations on one-column table functions can throw or return incorrect
> rows
> -------------------------------------------------------------------------------
>
> Key: CALCITE-7846
> URL: https://issues.apache.org/jira/browse/CALCITE-7846
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.42.0
> Environment: Calcite core and {{linq4j}} 1.42.0; Enumerable
> convention; {{{}EnumerableRel.Prefer.ARRAY{}}}. Reproduced in a Java test on
> macOS.
> Reporter: Rodrigo Setti
> Priority: Major
> Attachments: calcite-one-column-set-op-repro.zip
>
>
> A one-column user-defined table function and a one-column table can use
> different Enumerable row representations. Set operations between them can
> throw a {{ClassCastException}} or return incorrect rows.
> Reproducer on Calcite 1.42.0:
> * Register {{numbers_fn()}} using {{{}TableFunctionImpl{}}}. It returns a
> {{ScannableTable }}with one {{INTEGER}} column, n, and {{Object[]}} rows [1]
> and [2].
> * Register numbers_table as a {{ScannableTable}} with the same row type and
> {{Object[]}} rows [2] and [3].
> * Compile and execute the following query with the Enumerable convention and
> {{{}EnumerableRel.Prefer.ARRAY{}}}:
>
> {code:java}
> SELECT n FROM TABLE(numbers_fn())
> EXCEPT
> SELECT n FROM numbers_table{code}
>
> Expected: one row, n = 1.
> Actual: execution throws
> {code:java}
> java.lang.ClassCastException: java.lang.Integer cannot be cast to
> [Ljava.lang.Object; at
> org.apache.calcite.linq4j.function.Functions$ArrayEqualityComparer.hashCode.{code}
>
> The same mixed table/function shape should also yield correct results when
> the operand order is reversed, and with {{UNION}} and {{{}INTERSECT{}}}.
> Suspected cause: {{EnumerableTableFunctionScan.defaultTableFunctionImplement
> retains JavaRowFormat.ARRAY}} for this non-QueryableTable function, while a
> one-column {{EnumerableTableScan}} uses scalar rows. The set-operation
> comparer then receives incompatible representations.
> This is related to CALCITE-1907, which fixed a prior failure in the
> one-column table function that affected downstream operators. The
> set-operation reproducer above still fails on 1.42.0. As a downstream
> workaround, placing an identity {{EnumerableCalc}} immediately above the
> one-column {{EnumerableTableFunctionScan}} makes the query return the
> expected row.
> A regression test should cover {{EXCEPT}} in both directions, {{{}UNION{}}},
> and {{INTERSECT}} with the same one-column table and function.
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