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https://issues.apache.org/jira/browse/HIVE-591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753380#action_12753380
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Namit Jain commented on HIVE-591:
---------------------------------
SemanticAnalyzer.java:
The following lines are not needed
3079 if(opParseCtx == null) throw new SemanticException("ctx");
3080 if(child == null) throw new SemanticException("diteto");
3081 if(opParseCtx.get(child) == null) throw new
SemanticException("child "+child.toString());
Can you add more comments in CommonJoinOperator about the semantics of preserve
etc. ?
Otherwise, it looks good
> create new type of join ( 1 row for a given key from multiple tables)
> ---------------------------------------------------------------------
>
> Key: HIVE-591
> URL: https://issues.apache.org/jira/browse/HIVE-591
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Emil Ibrishimov
> Attachments: HIVE-591.1.patch, HIVE-591.2.patch, HIVE-591.3.patch
>
>
> It will be useful to support a new type of join:
> say:
> select .. from JOIN TABLES (A,B,C) WITH KEYS (A.key, B.key, C.key) where ....
> The semantics are that for a given key only 1 row is created - nulls are
> present for the the tables which do not contain a row for that key.
> There is no limit on the number of tables, the number of keys should be the
> same as the number of tables.
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