comnetwork commented on a change in pull request #444: PHOENIX-5148
URL: https://github.com/apache/phoenix/pull/444#discussion_r266184099
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File path:
phoenix-core/src/it/java/org/apache/phoenix/end2end/join/SubqueryUsingSortMergeJoinIT.java
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@@ -516,8 +516,8 @@ public void testAnyAllComparisonSubquery() throws
Exception {
assertEquals(rs.getString(2), "T6");
assertFalse(rs.next());
-
- query = "SELECT /*+ USE_SORT_MERGE_JOIN*/ \"order_id\", name FROM
" + tableName4 + " o JOIN " + tableName1 + " i ON o.\"item_id\" = i.\"item_id\"
WHERE quantity != ANY(SELECT quantity FROM " + tableName4 + " q WHERE
o.\"item_id\" = q.\"item_id\" GROUP BY quantity)";
+ //add order by to make the query result stable
+ query = "SELECT /*+ USE_SORT_MERGE_JOIN*/ \"order_id\", name FROM
" + tableName4 + " o JOIN " + tableName1 + " i ON o.\"item_id\" = i.\"item_id\"
WHERE quantity != ANY(SELECT quantity FROM " + tableName4 + " q WHERE
o.\"item_id\" = q.\"item_id\" GROUP BY quantity) order by \"order_id\"";
Review comment:
@twdsilva , thank you for your opinion, the reason why the query result with
this patch is not same as before this patch is different from previous test, if
there are more than two tuples which O.ITEM_ID are '0000000006', the query
result may not be accurately reversed. Following your suggestion, I would add
explain assertions to verify the unnecessary sort is avoid.
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