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https://issues.apache.org/jira/browse/TRAFODION-1673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379735#comment-15379735
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ASF GitHub Bot commented on TRAFODION-1673:
-------------------------------------------
Github user DaveBirdsall commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/577#discussion_r71010585
--- Diff: core/sql/parser/sqlparser.y ---
@@ -13418,6 +13507,55 @@ query_specification : select_token '['
firstn_sorted NUMERIC_LITERAL_EXACT_NO_SC
if (CmpCommon::getDefault(MVQR_LOG_QUERY_DESCRIPTORS) == DF_DUMP
||
CmpCommon::getDefault(MVQR_LOG_QUERY_DESCRIPTORS) ==
DF_DUMP_MV)
((RelRoot*)$$)->setAnalyzeOnly();
+ }
+/* type relx */
+query_specification : with_clause select_token '[' firstn_sorted
NUMERIC_LITERAL_EXACT_NO_SCALE ']' set_quantifier query_spec_body
+ {
+ if ($7) {
+ $$ = new (PARSERHEAP())
+ RelRoot(new (PARSERHEAP())
+ GroupByAgg($8
--- End diff --
I don't understand why we add a GroupByAgg node here.
> 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.
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