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https://issues.apache.org/jira/browse/IMPALA-10752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17811864#comment-17811864
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Daniel Becker commented on IMPALA-10752:
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When implementing this, pay special attention to variable length types in
structs (long strings and collections) because they may cause problems, see
IMPALA-12763.
> Support for UNION two structs
> -----------------------------
>
> Key: IMPALA-10752
> URL: https://issues.apache.org/jira/browse/IMPALA-10752
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend, Frontend
> Reporter: Gabor Kaszab
> Priority: Major
>
> {code:java}
> select id, tiny_struct from complextypes_structs
> union all
> select id, tiny_struct from complextypes_structs;
> {code}
> Result is the following error:
> {code:java}
> ERROR: AnalysisException: Incompatible return types 'STRUCT<b:BOOLEAN>' and
> 'STRUCT<b:BOOLEAN>' of exprs 'tiny_struct' and 'tiny_struct'.
> {code}
> where complextypes_structs is the following (note, it is same with parquet):
> {code:java}
> CREATE TABLE complextypes_structs (
> id int,
> tiny_struct struct<b:boolean>,
> small_struct struct<i:int, s:string>
> ) STORED AS ORC;
> {code}
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