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Zhihua Deng edited comment on HIVE-24422 at 10/10/23 1:21 AM: -------------------------------------------------------------- Seems I was wrong. In the trunk, the query {code:java} with game_info as ( select distinct ext_id, dev_app_id, game_name from game_info_extend ) select count(game_name) from game_info;{code} The game_info is materialized, this can reduce recomputing of game_info no matter how many times the game_info is referenced. was (Author: dengzh): Seems I am wrong. In the trunk, the query {code:java} with game_info as ( select distinct ext_id, dev_app_id, game_name from game_info_extend ) select count(game_name) from game_info;{code} The game_info is firstly materialized, this can reduce recomputing of game_info no matter how many times the game_info is referenced , the materialized view is used other than the table game_info for analyzing the tree later on. > 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. > -- This message was sent by Atlassian Jira (v8.20.10#820010)