vineetgarg02 commented on a change in pull request #860: HIVE-22408 The fix for
CALCITE-2991 creates wrong results on edge case
URL: https://github.com/apache/hive/pull/860#discussion_r356957099
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveSortLimitRemoveRule.java
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@@ -41,8 +42,17 @@ public boolean matches(RelOptRuleCall call) {
final HiveSortLimit sortLimit = call.rel(0);
Double maxRowCount =
call.getMetadataQuery().getMaxRowCount(sortLimit.getInput());
- if (maxRowCount != null &&(maxRowCount <= 1)) {
- return true;
+ if (maxRowCount != null) {
+ if (sortLimit.getFetchExpr() != null) {
+ // we have LIMIT
+ int limit = RexLiteral.intValue(sortLimit.getFetchExpr());
+ if (maxRowCount <= limit) {
Review comment:
@kgyrtkirk `MaxRowCount` is guaranteed to return the number of rows which
will be >= the actual number of rows, therefore we should never end up removing
LIMIT when we shoudn't
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