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https://issues.apache.org/jira/browse/FLINK-12200?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young closed FLINK-12200.
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Resolution: Implemented
Fix Version/s: 1.9.0
merged in 1.9.0: 2c390243739dcbf4a4abe93765b5b2064f6e26c7
> [Table API] Support UNNEST for MAP types
> -----------------------------------------
>
> Key: FLINK-12200
> URL: https://issues.apache.org/jira/browse/FLINK-12200
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Affects Versions: 1.7.2, 1.7.3, 1.8.0, 1.8.1
> Reporter: Artsem Semianenka
> Assignee: Artsem Semianenka
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Original Estimate: 24h
> Time Spent: 20m
> Remaining Estimate: 23h 40m
>
> In case if the input dataset has the following schema :
> Row(a: Integer, b: Long, c: Map<String, String>)
> I would like to have the ability to execute the SQL query like:
> {code:sql}
> SELECT a, k, v FROM src, UNNEST(c) as m (k,v)
> {code}
> Currently, the UNNEST operator is supported only for ARRAY and MULTISET
> I would like to propose adding the support of UNNEST functionality for MAP
> types.
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