morrySnow commented on code in PR #35162:
URL: https://github.com/apache/doris/pull/35162#discussion_r1611406226
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/implementation/AggregateStrategies.java:
##########
@@ -306,6 +317,46 @@ && couldConvertToMulti(agg))
);
}
+ /*
+ * select 66 from baseall_dup; could use pushAggOp=COUNT to not scan real
data.
+ */
+ private LogicalProject<? extends Plan> pushDownCountWithoutSlotRef(
+ LogicalProject<? extends Plan> project,
+ LogicalOlapScan logicalScan,
+ CascadesContext cascadesContext) {
+ final LogicalProject<? extends Plan> canNotPush = project;
+ if (!enablePushDownNoGroupAgg()) {
+ return canNotPush;
+ }
+ if (logicalScan != null) {
+ KeysType keysType = logicalScan.getTable().getKeysType();
+ if (keysType != KeysType.DUP_KEYS) {
+ return canNotPush;
+ }
+ }
+ List<Expression> projectExpr = new ArrayList<>();
+ for (Expression p : project.getProjects()) {
+ projectExpr.addAll(Project.collectExpressions(p));
+ }
+ boolean noSlotRef = true;
+ for (Expression expr : projectExpr) {
+ if (expr instanceof SlotReference) {
+ noSlotRef = false;
+ break;
+ }
+ }
+ if (!noSlotRef) {
+ return canNotPush;
+ }
Review Comment:
```java
for (Expression e : project.getProjects()) {
if (e.anyMatch(SlotReference.class::isInstance)) {
return canNotPush;
}
}
```
btw, could not push down, if contains Nondeterministic expression, such as
UUID()
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