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https://issues.apache.org/jira/browse/PHOENIX-2722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15225278#comment-15225278
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ASF GitHub Bot commented on PHOENIX-2722:
-----------------------------------------
Github user JamesRTaylor commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/154#discussion_r58467053
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/compile/SubqueryRewriter.java ---
@@ -167,7 +167,7 @@ public ParseNode visitLeave(ExistsParseNode node,
List<ParseNode> l) throws SQLE
JoinConditionExtractor conditionExtractor = new
JoinConditionExtractor(subquery, resolver, connection, rhsTableAlias);
ParseNode where = subquery.getWhere() == null ? null :
subquery.getWhere().accept(conditionExtractor);
if (where == subquery.getWhere()) { // non-correlated EXISTS
subquery, add LIMIT 1
- subquery = NODE_FACTORY.select(subquery,
NODE_FACTORY.limit(NODE_FACTORY.literal(1)));
+ subquery = NODE_FACTORY.select(subquery,
NODE_FACTORY.limit(NODE_FACTORY.literal(1)), null);
--- End diff --
Always null here? Just want to confirm that this is correct.
> support mysql "limit,offset" clauses
> -------------------------------------
>
> Key: PHOENIX-2722
> URL: https://issues.apache.org/jira/browse/PHOENIX-2722
> Project: Phoenix
> Issue Type: New Feature
> Reporter: Ankit Singhal
> Assignee: Ankit Singhal
> Priority: Minor
> Attachments: PHOENIX-2722.patch, PHOENIX-2722_formatted.patch
>
>
> For serial query(query with “serial" hint or “limit" without "order by”), we
> can limit each scan(using page filter) to “limit+offset” instead of limit
> earlier.
> And then, for all queries, we can forward the relevant client iterators to
> the offset provided and then return the result.
> syntax
> {code}
> [ LIMIT { count } ]
> [ OFFSET start [ ROW | ROWS ] ]
> [ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY ]
> {code}
> Some new keywords(OFFSET,FETCH,ROW, ROWS,ONLY) are getting introduced so
> users might need to see that they are not using them as column name or
> something.
> WDYT, [~jamestaylor]
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