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https://issues.apache.org/jira/browse/FLINK-36415?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Nuyanzin resolved FLINK-36415.
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Fix Version/s: 2.0-preview
Resolution: Fixed
Merged as
[f9dfa1833f2c37d155cb8180ed4f4aec182ca537|https://github.com/apache/flink/commit/f9dfa1833f2c37d155cb8180ed4f4aec182ca537]
> ProjectWatermarkAssignerTransposeRule can generate extra casts which do not
> make sense
> --------------------------------------------------------------------------------------
>
> Key: FLINK-36415
> URL: https://issues.apache.org/jira/browse/FLINK-36415
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
> Fix For: 2.0-preview
>
>
> For instance
> if there is a table containing deeply nested array and rows like this
> {code:sql}
> `chart` row<`result` array<row<`meta` row<`symbol` string not null> not null>
> not null> not null>
> {code}
> then {{SELECT}} of this column like
> {code:sql}
> SELECT `chart`.`result`[1].`meta`.`symbol` FROM ...
> {code}
> will have the optimized plan like
> {noformat}
> LogicalProject(EXPR$0=[CAST(CAST(CAST(CAST(ITEM($0.result,
> 1).meta):RecordType:peek_no_expand(VARCHAR(2147483647) CHARACTER SET
> "UTF-16LE" NOT NULL symbol)):RecordType:peek_no_expand(VARCHAR(2147483647)
> CHARACTER SET "UTF-16LE" NOT NULL symbol).symbol):VARCHAR(2147483647)
> CHARACTER SET "UTF-16LE"):VARCHAR(2147483647) CHARACTER SET "UTF-16LE"])
> +- LogicalTableScan(table=[[default_catalog, default_database, ItemTable,
> project=[chart], metadata=[]]])
> {noformat}
> while it should contain only 2 casts (one to cast to Varchar and another for
> RecordType:peek_no_expand), to others are useless
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