morningman commented on a change in pull request #2821: The new materialized
view selector
URL: https://github.com/apache/incubator-doris/pull/2821#discussion_r370971774
##########
File path: fe/src/main/java/org/apache/doris/planner/OlapScanNode.java
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@@ -497,4 +571,107 @@ public static OlapScanNode createOlapScanNodeByLocation(
return olapScanNode;
}
+
+ public void collectColumns(Analyzer analyzer, Set<String>
equivalenceColumns, Set<String> unequivalenceColumns) {
+ // 1. Get columns which has predicate on it.
+ for (Expr expr : conjuncts) {
+ if (!isPredicateUsedForPrefixIndex(expr, false)) {
+ continue;
+ }
+ for (SlotDescriptor slot : desc.getMaterializedSlots()) {
+ if (expr.isBound(slot.getId())) {
+ if (!isEquivalenceExpr(expr)) {
+ unequivalenceColumns.add(slot.getColumn().getName());
+ } else {
+ equivalenceColumns.add(slot.getColumn().getName());
+ }
+ break;
+ }
+ }
+ }
+
+ // 2. Equal join predicates when pushing inner child.
+ List<Expr> eqJoinPredicate = analyzer.getEqJoinConjuncts(desc.getId());
+ for (Expr expr : eqJoinPredicate) {
+ if (!isPredicateUsedForPrefixIndex(expr, true)) {
+ continue;
+ }
+ for (SlotDescriptor slot : desc.getMaterializedSlots()) {
+ for (int i = 0; i < 2; i++) {
Review comment:
getChildren.size() is better for code reading.
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