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https://issues.apache.org/jira/browse/CALCITE-6938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-6938:
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Labels: pull-request-available (was: )
> Support zero value creation of nested data types
> ------------------------------------------------
>
> Key: CALCITE-6938
> URL: https://issues.apache.org/jira/browse/CALCITE-6938
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zhen Chen
> Assignee: Zhen Chen
> Priority: Major
> Labels: pull-request-available
>
> This implementation ensures zero values of various nested data types can be
> used in {{COALESCE(nestedCol, nestedZero)}} expressions.
> Basic Nested Types:
> # ARRAY: Zero value represented as an zero array. e.g. ARRAY<INTEGER> →
> ARRAY[0]
> # MULTISET: Zero value represented as an zero multiset. e.g.
> MULTISET<INTEGER> → MULTISET[0]
> # MAP: Zero value represented as an zero map. e.g. MAP<INTEGER, INTEGER> →
> MAP(0, 0)
> # ROW: Zero value with all fields initialized to their respective type's
> zero value. e.g. ROW<INTEGER, INTEGER> → ROW(0, 0)
> Complex Nested Types:
> * {{ARRAY<ARRAY<INTEGER>>}}
> * {{ARRAY<MAP<VARCHAR(50), INTEGER>>}}
> * MAP<STRING, ARRAY<ROW<INT, BOOLEAN>>>
> * ......
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