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https://issues.apache.org/jira/browse/HIVE-857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759774#action_12759774
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Zheng Shao commented on HIVE-857:
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This only affects 0.4.
The transaction that added the new syntax is r803371, HIVE-743. Let user
specify serde for custom sctipts. (Namit Jain via rmurthy)
The transaction that fixed the issue is r807330, HIVE-708. Add TypedBytes SerDe
for transform. (Namit Jain via zshao).
We may either pull in the whole of HIVE-708 to branch 0.4, or split HIVE-708's
transaction.
> Transform should produce objects in the same type as specified at runtime
> -------------------------------------------------------------------------
>
> Key: HIVE-857
> URL: https://issues.apache.org/jira/browse/HIVE-857
> Project: Hadoop Hive
> Issue Type: Bug
> Affects Versions: 0.4.0, 0.4.1
> Reporter: Zheng Shao
>
> The following code fails at runtime, because the "clicked" field produced by
> "transform" is actually of type String at runtime, instead of boolean.
> {code}
> INSERT OVERWRITE TABLE feature_index
> SELECT
> temp.feature,
> temp.ad_id,
> sum(if(temp.clicked, 1, 0)) / cast(count(temp.clicked) as DOUBLE) as
> clicked_percent
> FROM (
> SELECT concat('ua:', trim(lower(ua.feature))) as feature, ua.ad_id,
> ua.clicked
> FROM (
> MAP raw_logs.user_agent, raw_logs.ad_id, raw_logs.clicked
> USING 'my.py' as (feature STRING, ad_id STRING, clicked BOOLEAN)
> FROM raw_logs
> ) ua
> ) temp
> GROUP BY temp.feature, temp.ad_id;
> {code}
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