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https://issues.apache.org/jira/browse/FLINK-31182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17692156#comment-17692156
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Jane Chan commented on FLINK-31182:
-----------------------------------
Correct me if I'm wrong, but for all BultinFunctionDefinition with output type
strategy as TypeStrategies.MISSING, the deserialization will fail. By removing
the check, the execution of the deserialized plan is successful. However, I'm
not very sure about the purpose of the check. Can anyone shed some light?
> CompiledPlan cannot deserialize BridgingSqlFunction with MissingTypeStrategy
> ----------------------------------------------------------------------------
>
> Key: FLINK-31182
> URL: https://issues.apache.org/jira/browse/FLINK-31182
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.17.0, 1.18.0, 1.17.1
> Reporter: Jane Chan
> Priority: Major
> Attachments: screenshot-1.png
>
>
> This issue is reported from the [user mail
> list|https://lists.apache.org/thread/dglf8zgtt1yx3vrdytn0dlv7b3pw1nq6].
> The stacktrace is
> {code:java}
> Unable to find source-code formatter for language: text. Available languages
> are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go,
> groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc,
> perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml,
> yamlCaused by: org.apache.flink.table.api.TableException: Could not resolve
> internal system function '$UNNEST_ROWS$1'. This is a bug, please file an
> issue.
> at
> org.apache.flink.table.planner.plan.nodes.exec.serde.RexNodeJsonDeserializer.deserializeInternalFunction(RexNodeJsonDeserializer.java:392)
> at
> org.apache.flink.table.planner.plan.nodes.exec.serde.RexNodeJsonDeserializer.deserializeSqlOperator(RexNodeJsonDeserializer.java:337)
> at
> org.apache.flink.table.planner.plan.nodes.exec.serde.RexNodeJsonDeserializer.deserializeCall(RexNodeJsonDeserializer.java:307)
> at
> org.apache.flink.table.planner.plan.nodes.exec.serde.RexNodeJsonDeserializer.deserialize(RexNodeJsonDeserializer.java:146)
> at
> org.apache.flink.table.planner.plan.nodes.exec.serde.RexNodeJsonDeserializer.deserialize(RexNodeJsonDeserializer.java:128)
> at
> org.apache.flink.table.planner.plan.nodes.exec.serde.RexNodeJsonDeserializer.deserialize(RexNodeJsonDeserializer.java:115)
> {code}
> The root cause is that although ModuleManager can resolve '$UNNEST_ROWS$1',
> the output type strategy is "Missing"; as a result,
> FunctionCatalogOperatorTable#convertToBridgingSqlFunction returns empty.
> !screenshot-1.png|width=675,height=295!
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