This is an automated cherry-pick of pingcap#50439

Signed-off-by: ti-chi-bot <[email protected]>

pkg/planner/core/exhaust_physical_plans.go

@@ -959,7 +959,21 @@ func (p *LogicalJoin) buildIndexJoinInner2IndexScan(
 	outerIdx int, avgInnerRowCnt float64) (joins []PhysicalPlan) {
 	ds := wrapper.ds
 	us := wrapper.us
-	helper, keyOff2IdxOff := p.getIndexJoinBuildHelper(ds, innerJoinKeys, func(path *util.AccessPath) bool { return !path.IsTablePath() }, outerJoinKeys)
+	indexValid := func(path *util.AccessPath) bool {
+		if path.IsTablePath() {
+			return false
+		}
+		// if path is index path. index path currently include two kind of, one is normal, and the other is mv index.
+		// for mv index like mvi(a, json, b), if driving condition is a=1, and we build a prefix scan with range [1,1]
+		// on mvi, it will return many index rows which breaks handle-unique attribute here.
+		//
+		// the basic rule is that: mv index can be and can only be accessed by indexMerge operator. (embedded handle duplication)
+		if !isMVIndexPath(path) {
+			return true // not a MVIndex path, it can successfully be index join probe side.
+		}
+		return false
+	}
+	helper, keyOff2IdxOff := p.getIndexJoinBuildHelper(ds, innerJoinKeys, indexValid, outerJoinKeys)
 	if helper == nil {
 		return nil
 	}