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https://issues.apache.org/jira/browse/FLINK-34633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17838429#comment-17838429
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Jane Chan commented on FLINK-34633:
-----------------------------------
Fixed in master 43a3d50ce3982b9abf04b81407fed46c5c25f819
> Support unnesting array constants
> ---------------------------------
>
> Key: FLINK-34633
> URL: https://issues.apache.org/jira/browse/FLINK-34633
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Affects Versions: 1.18.1
> Reporter: Xingcan Cui
> Assignee: Jeyhun Karimov
> Priority: Minor
> Labels: pull-request-available
>
> It seems that the current planner doesn't support using UNNEST on array
> constants.(x)
> {code:java}
> SELECT * FROM UNNEST(ARRAY[1,2,3]);{code}
>
> The following query can't be compiled.(x)
> {code:java}
> SELECT * FROM (VALUES('a')) CROSS JOIN UNNEST(ARRAY[1, 2, 3]){code}
>
> The rewritten version works. (/)
> {code:java}
> SELECT * FROM (SELECT *, ARRAY[1,2,3] AS A FROM (VALUES('a'))) CROSS JOIN
> UNNEST(A){code}
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