Don't push sample correction through mv_expand

Author: jan-elastic

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/optimizer/rules/logical/ApplySampleCorrections.java

@@ -13,6 +13,7 @@
 import org.elasticsearch.xpack.esql.plan.logical.Aggregate;
 import org.elasticsearch.xpack.esql.plan.logical.Limit;
 import org.elasticsearch.xpack.esql.plan.logical.LogicalPlan;
+import org.elasticsearch.xpack.esql.plan.logical.MvExpand;
 import org.elasticsearch.xpack.esql.plan.logical.Sample;
 import org.elasticsearch.xpack.esql.rule.Rule;
 
@@ -25,7 +26,7 @@ public LogicalPlan apply(LogicalPlan logicalPlan) {
             if (plan instanceof Sample sample) {
                 sampleProbability.set(sample.probability());
             }
-            if (plan instanceof Limit) {
+            if (plan instanceof Limit || plan instanceof MvExpand) {
                 sampleProbability.set(null);
             }
             if (plan instanceof Aggregate && sampleProbability.get() != null) {