zstan commented on a change in pull request #8590:
URL: https://github.com/apache/ignite/pull/8590#discussion_r548838646
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File path:
modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/rel/IgniteTrimExchange.java
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@@ -87,8 +94,10 @@ public IgniteTrimExchange(RelInput input) {
/** {@inheritDoc} */
@Override public RelOptCost computeSelfCost(RelOptPlanner planner,
RelMetadataQuery mq) {
- double rowCount = mq.getRowCount(this);
- return planner.getCostFactory().makeCost(rowCount, rowCount, 0);
+ double rowCount = mq.getRowCount(getInput());
+
+ return planner.getCostFactory().makeCost(rowCount,
+ rowCount * (IgniteCost.ROW_COMPARISON_COST +
IgniteCost.ROW_PASS_THROUGH_COST), 0);
Review comment:
not obvious here, can u explain plz ? why :
IgniteCost.ROW_COMPARISON_COST + IgniteCost.ROW_PASS_THROUGH_COST
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