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https://issues.apache.org/jira/browse/HIVE-24422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17252750#comment-17252750
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Zhihua Deng commented on HIVE-24422:
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Seems I am wrong. In the trunk, the query
{{with game_info as ( select distinct ext_id, dev_app_id, game_name from
game_info_extend ) select count(game_name) from game_info;}} , the game_info is
firstly materialized, this can reduce recomputing of game_info no matter how
many times the game_info is referenced later on.
The condition {{if (tab == null ||
tab.getDbName().equals(SessionState.get().getCurrentDatabase())) }}in
getMetaData will be evaluated to be true as the latter predicate is true, so
the materialized view is taken other than the table {{game_info}} for analyzing
the tree.
> Throw SemanticException when CTE alias is conflicted with table name
> --------------------------------------------------------------------
>
> Key: HIVE-24422
> URL: https://issues.apache.org/jira/browse/HIVE-24422
> Project: Hive
> Issue Type: Improvement
> Components: Parser
> Reporter: Zhihua Deng
> Assignee: Zhihua Deng
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> If the alias of CTE is conflicted with the table name, we use the alias
> fetching the table other than replacing it with the ASTNode tree, this may
> cause some confusing problems. For example:
> {noformat}
> create table game_info (game_name string);
> with game_info as (
> select distinct ext_id, dev_app_id, game_name
> from game_info_extend )
> select count(game_name) from game_info;{noformat}
> The query will return the number of rows of the table game_info, instead of
> the game_info_extend. Maybe we should better throw an exception to avoid such
> cases.
>
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