xndai commented on a change in pull request #1354: [CALCITE-482] Implement sql
and planner hints
URL: https://github.com/apache/calcite/pull/1354#discussion_r335117856
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File path:
core/src/main/java/org/apache/calcite/plan/volcano/VolcanoRuleCall.java
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@@ -88,6 +89,7 @@ protected VolcanoRuleCall(
// implement RelOptRuleCall
public void transformTo(RelNode rel, Map<RelNode, RelNode> equiv) {
+ rel = RelOptUtil.copyRelHints(rels[0], rel);
Review comment:
Is it safe to assume the original hint alway coming from rels[0]?
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