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ASF GitHub Bot commented on TRAFODION-1673: ------------------------------------------- Github user zellerh commented on a diff in the pull request: https://github.com/apache/incubator-trafodion/pull/577#discussion_r69836669 --- Diff: core/sql/parser/sqlparser.y --- @@ -7001,6 +7036,46 @@ rel_subquery_and_as_clause : rel_subquery as_clause $$ = $2; } +with_clause_list : with_clause + { $$ = $1 ; } + + | with_clause_list ',' correlation_name TOK_AS rel_subquery --- End diff -- Can we do this in a way that doesn't have two different rules for the first and the subsequent parts of the WITH clause? See comment above for how the ANSI standard handles the WITH clause. > Implement the WITH clause in Trafodion SQL for simple use cases > --------------------------------------------------------------- > > Key: TRAFODION-1673 > URL: https://issues.apache.org/jira/browse/TRAFODION-1673 > Project: Apache Trafodion > Issue Type: New Feature > Components: sql-cmp > Reporter: Hans Zeller > Assignee: liu ming > > We keep running into queries that use a WITH clause to define a temporary > view that can be used once or multiple times in a FROM clause in the query. > For non-recursive queries, the WITH clause could probably be handled very > similar to a view. When it is defined, we create an in-memory view > descriptor, containing the name and the definition. When it is used in a FROM > clause, we could go through a code path similar to that of a view - bind the > (temporary) view text and substitute it in the query. The fix could probably > be handled entirely in the binder. > This JIRA is *not* about recursive queries, those would require a lot more > effort, involving many components in addition to the binder. -- This message was sent by Atlassian JIRA (v6.3.4#6332)