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Posted to commits@jackrabbit.apache.org by al...@apache.org on 2012/03/28 16:01:53 UTC
svn commit: r1306337 -
/jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/query/lucene/join/QueryEngine.java
Author: alexparvulescu
Date: Wed Mar 28 14:01:53 2012
New Revision: 1306337
URL: http://svn.apache.org/viewvc?rev=1306337&view=rev
Log:
JCR-3280 SQL2 joins on empty sets are not efficient
Modified:
jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/query/lucene/join/QueryEngine.java
Modified: jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/query/lucene/join/QueryEngine.java
URL: http://svn.apache.org/viewvc/jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/query/lucene/join/QueryEngine.java?rev=1306337&r1=1306336&r2=1306337&view=diff
==============================================================================
--- jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/query/lucene/join/QueryEngine.java (original)
+++ jackrabbit/trunk/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/query/lucene/join/QueryEngine.java Wed Mar 28 14:01:53 2012
@@ -245,6 +245,11 @@ public class QueryEngine {
Comparator<Row> rightCo = new RowPathComparator(
merger.getRightSelectors());
+ if (leftRows == null || leftRows.isEmpty()) {
+ return merger.merge(new RowIteratorAdapter(leftRows),
+ new RowIteratorAdapter(new TreeSet<Row>()), null, rightCo);
+ }
+
Set<Row> rightRows = buildRightRowsJoin(csInfo, rightConstraints,
isOuterJoin, rightCo, printIndentation + printIndentStep);