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https://issues.apache.org/jira/browse/HIVE-15567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun updated HIVE-15567:
----------------------------
Description:
For the following query:
{code}
SELECT some_array_col.some_struct_field from tbl
{code}
where {{some_array_col}} is an array of structs, we currently need to scan the
entire array for all the struct fields, which is not optimal.
Ideally we should only scan the selected {{some_struct_field}} from all the
array elements.
> Nested column pruning: further prune the case for SELECT array.struct_field
> ----------------------------------------------------------------------------
>
> Key: HIVE-15567
> URL: https://issues.apache.org/jira/browse/HIVE-15567
> Project: Hive
> Issue Type: Sub-task
> Components: Logical Optimizer, Physical Optimizer,
> Serializers/Deserializers
> Reporter: Chao Sun
>
> For the following query:
> {code}
> SELECT some_array_col.some_struct_field from tbl
> {code}
> where {{some_array_col}} is an array of structs, we currently need to scan
> the entire array for all the struct fields, which is not optimal.
> Ideally we should only scan the selected {{some_struct_field}} from all the
> array elements.
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