diff --git a/core/src/main/scala/org/apache/spark/api/r/SerDe.scala b/core/src/main/scala/org/apache/spark/api/r/SerDe.scala
index f9f8c56eb86c4..f06d3d001261f 100644
--- a/core/src/main/scala/org/apache/spark/api/r/SerDe.scala
+++ b/core/src/main/scala/org/apache/spark/api/r/SerDe.scala
@@ -21,9 +21,10 @@ import java.io.{DataInputStream, DataOutputStream}
 import java.nio.charset.StandardCharsets
 import java.sql.{Date, Time, Timestamp}
 
-import scala.collection.JavaConverters._
 import scala.collection.mutable
 
+import org.apache.spark.util.collection.Utils
+
 /**
  * Utility functions to serialize, deserialize objects to / from R
  */
@@ -236,7 +237,7 @@ private[spark] object SerDe {
       val keys = readArray(in, jvmObjectTracker).asInstanceOf[Array[Object]]
       val values = readList(in, jvmObjectTracker)
 
-      keys.zip(values).toMap.asJava
+      Utils.toJavaMap(keys, values)
     } else {
       new java.util.HashMap[Object, Object]()
     }
diff --git a/core/src/main/scala/org/apache/spark/util/Utils.scala b/core/src/main/scala/org/apache/spark/util/Utils.scala
index aef79c7882ca1..e525b45f7ded3 100644
--- a/core/src/main/scala/org/apache/spark/util/Utils.scala
+++ b/core/src/main/scala/org/apache/spark/util/Utils.scala
@@ -74,6 +74,7 @@ import org.apache.spark.launcher.SparkLauncher
 import org.apache.spark.network.util.JavaUtils
 import org.apache.spark.serializer.{DeserializationStream, SerializationStream, Serializer, SerializerInstance}
 import org.apache.spark.status.api.v1.{StackTrace, ThreadStackTrace}
+import org.apache.spark.util.collection.{Utils => CUtils}
 import org.apache.spark.util.io.ChunkedByteBufferOutputStream
 
 /** CallSite represents a place in user code. It can have a short and a long form. */
@@ -1718,7 +1719,8 @@ private[spark] object Utils extends Logging {
     assert(files.length == fileLengths.length)
     val startIndex = math.max(start, 0)
     val endIndex = math.min(end, fileLengths.sum)
-    val fileToLength = files.zip(fileLengths).toMap
+    val fileToLength = CUtils.toMap(files, fileLengths)
+
     logDebug("Log files: \n" + fileToLength.mkString("\n"))
 
     val stringBuffer = new StringBuffer((endIndex - startIndex).toInt)
diff --git a/core/src/main/scala/org/apache/spark/util/collection/Utils.scala b/core/src/main/scala/org/apache/spark/util/collection/Utils.scala
index 989ff69141750..f9bc76de6ef94 100644
--- a/core/src/main/scala/org/apache/spark/util/collection/Utils.scala
+++ b/core/src/main/scala/org/apache/spark/util/collection/Utils.scala
@@ -17,7 +17,10 @@
 
 package org.apache.spark.util.collection
 
+import java.util.Collections
+
 import scala.collection.JavaConverters._
+import scala.collection.immutable
 
 import com.google.common.collect.{Iterators => GuavaIterators, Ordering => GuavaOrdering}
 
@@ -62,4 +65,30 @@ private[spark] object Utils {
    */
   def sequenceToOption[T](input: Seq[Option[T]]): Option[Seq[T]] =
     if (input.forall(_.isDefined)) Some(input.flatten) else None
+
+  /**
+   * Same function as `keys.zip(values).toMap`, but has perf gain.
+   */
+  def toMap[K, V](keys: Iterable[K], values: Iterable[V]): Map[K, V] = {
+    val builder = immutable.Map.newBuilder[K, V]
+    val keyIter = keys.iterator
+    val valueIter = values.iterator
+    while (keyIter.hasNext && valueIter.hasNext) {
+      builder += (keyIter.next(), valueIter.next()).asInstanceOf[(K, V)]
+    }
+    builder.result()
+  }
+
+  /**
+   * Same function as `keys.zip(values).toMap.asJava`, but has perf gain.
+   */
+  def toJavaMap[K, V](keys: Iterable[K], values: Iterable[V]): java.util.Map[K, V] = {
+    val map = new java.util.HashMap[K, V]()
+    val keyIter = keys.iterator
+    val valueIter = values.iterator
+    while (keyIter.hasNext && valueIter.hasNext) {
+      map.put(keyIter.next(), valueIter.next())
+    }
+    Collections.unmodifiableMap(map)
+  }
 }
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala b/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala
index 6ff8262c4983f..37e57736574eb 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala
@@ -26,6 +26,7 @@ import org.apache.spark.annotation.Since
 import org.apache.spark.api.java.{JavaRDD, JavaSparkContext}
 import org.apache.spark.internal.Logging
 import org.apache.spark.rdd.RDD
+import org.apache.spark.util.collection.Utils
 
 /**
  * Evaluator for ranking algorithms.
@@ -155,7 +156,7 @@ class RankingMetrics[T: ClassTag] @Since("1.2.0") (predictionAndLabels: RDD[_ <:
     rdd.map { case (pred, lab, rel) =>
       val useBinary = rel.isEmpty
       val labSet = lab.toSet
-      val relMap = lab.zip(rel).toMap
+      val relMap = Utils.toMap(lab, rel)
       if (useBinary && lab.size != rel.size) {
         logWarning(
           "# of ground truth set and # of relevance value set should be equal, " +
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/CatalystTypeConverters.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/CatalystTypeConverters.scala
index 263d3734217bc..fcb8a5d0545aa 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/CatalystTypeConverters.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/CatalystTypeConverters.scala
@@ -35,6 +35,7 @@ import org.apache.spark.sql.types._
 import org.apache.spark.sql.types.DayTimeIntervalType._
 import org.apache.spark.sql.types.YearMonthIntervalType._
 import org.apache.spark.unsafe.types.UTF8String
+import org.apache.spark.util.collection.Utils
 
 /**
  * Functions to convert Scala types to Catalyst types and vice versa.
@@ -229,7 +230,7 @@ object CatalystTypeConverters {
         val convertedValues =
           if (isPrimitive(valueType)) values else values.map(valueConverter.toScala)
 
-        convertedKeys.zip(convertedValues).toMap
+        Utils.toMap(convertedKeys, convertedValues)
       }
     }
 
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
index 6fc9d756c998d..7c00b469e7b39 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
@@ -58,6 +58,7 @@ import org.apache.spark.sql.types.DayTimeIntervalType.DAY
 import org.apache.spark.sql.util.{CaseInsensitiveStringMap, SchemaUtils}
 import org.apache.spark.unsafe.types.{CalendarInterval, UTF8String}
 import org.apache.spark.util.Utils
+import org.apache.spark.util.collection.{Utils => CUtils}
 
 /**
  * A trivial [[Analyzer]] with a dummy [[SessionCatalog]], [[EmptyFunctionRegistry]] and
@@ -3457,7 +3458,7 @@ class Analyzer(override val catalogManager: CatalogManager)
         throw QueryCompilationErrors.writeTableWithMismatchedColumnsError(
           cols.size, query.output.size, query)
       }
-      val nameToQueryExpr = cols.zip(query.output).toMap
+      val nameToQueryExpr = CUtils.toMap(cols, query.output)
       // Static partition columns in the table output should not appear in the column list
       // they will be handled in another rule ResolveInsertInto
       val reordered = tableOutput.flatMap { nameToQueryExpr.get(_).orElse(None) }
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/DecorrelateInnerQuery.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/DecorrelateInnerQuery.scala
index fe957342180a3..e61ad8e1fab7d 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/DecorrelateInnerQuery.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/DecorrelateInnerQuery.scala
@@ -25,6 +25,7 @@ import org.apache.spark.sql.catalyst.plans._
 import org.apache.spark.sql.catalyst.plans.logical._
 import org.apache.spark.sql.catalyst.trees.TreePattern.OUTER_REFERENCE
 import org.apache.spark.sql.errors.QueryExecutionErrors
+import org.apache.spark.util.collection.Utils
 
 /**
  * Decorrelate the inner query by eliminating outer references and create domain joins.
@@ -346,7 +347,7 @@ object DecorrelateInnerQuery extends PredicateHelper {
           val domains = attributes.map(_.newInstance())
           // A placeholder to be rewritten into domain join.
           val domainJoin = DomainJoin(domains, plan)
-          val outerReferenceMap = attributes.zip(domains).toMap
+          val outerReferenceMap = Utils.toMap(attributes, domains)
           // Build join conditions between domain attributes and outer references.
           // EqualNullSafe is used to make sure null key can be joined together. Note
           // outer referenced attributes can be changed during the outer query optimization.
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PushdownPredicatesAndPruneColumnsForCTEDef.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PushdownPredicatesAndPruneColumnsForCTEDef.scala
index fde22b249b690..f351ba0b39af9 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PushdownPredicatesAndPruneColumnsForCTEDef.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PushdownPredicatesAndPruneColumnsForCTEDef.scala
@@ -24,6 +24,7 @@ import org.apache.spark.sql.catalyst.planning.PhysicalOperation
 import org.apache.spark.sql.catalyst.plans.logical._
 import org.apache.spark.sql.catalyst.rules.Rule
 import org.apache.spark.sql.catalyst.trees.TreePattern.CTE
+import org.apache.spark.util.collection.Utils
 
 /**
  * Infer predicates and column pruning for [[CTERelationDef]] from its reference points, and push
@@ -71,7 +72,7 @@ object PushdownPredicatesAndPruneColumnsForCTEDef extends Rule[LogicalPlan] {
 
       case PhysicalOperation(projects, predicates, ref: CTERelationRef) =>
         val (cteDef, precedence, preds, attrs) = cteMap(ref.cteId)
-        val attrMapping = ref.output.zip(cteDef.output).map{ case (r, d) => r -> d }.toMap
+        val attrMapping = Utils.toMap(ref.output, cteDef.output)
         val newPredicates = if (isTruePredicate(preds)) {
           preds
         } else {
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDistinctAggregates.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDistinctAggregates.scala
index 4511b3038f029..1a58f45c07a29 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDistinctAggregates.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDistinctAggregates.scala
@@ -23,6 +23,7 @@ import org.apache.spark.sql.catalyst.plans.logical.{Aggregate, Expand, LogicalPl
 import org.apache.spark.sql.catalyst.rules.Rule
 import org.apache.spark.sql.catalyst.trees.TreePattern.AGGREGATE
 import org.apache.spark.sql.types.IntegerType
+import org.apache.spark.util.collection.Utils
 
 /**
  * This rule rewrites an aggregate query with distinct aggregations into an expanded double
@@ -265,7 +266,7 @@ object RewriteDistinctAggregates extends Rule[LogicalPlan] {
 
       // Setup expand & aggregate operators for distinct aggregate expressions.
       val distinctAggChildAttrLookup = distinctAggChildAttrMap.toMap
-      val distinctAggFilterAttrLookup = distinctAggFilters.zip(maxConds.map(_.toAttribute)).toMap
+      val distinctAggFilterAttrLookup = Utils.toMap(distinctAggFilters, maxConds.map(_.toAttribute))
       val distinctAggOperatorMap = distinctAggGroups.toSeq.zipWithIndex.map {
         case ((group, expressions), i) =>
           val id = Literal(i + 1)
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/ArrayBasedMapData.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/ArrayBasedMapData.scala
index 3768f7a1824f1..dd72ff4d3d083 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/ArrayBasedMapData.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/ArrayBasedMapData.scala
@@ -19,6 +19,8 @@ package org.apache.spark.sql.catalyst.util
 
 import java.util.{Map => JavaMap}
 
+import org.apache.spark.util.collection.Utils
+
 /**
  * A simple `MapData` implementation which is backed by 2 arrays.
  *
@@ -129,20 +131,19 @@ object ArrayBasedMapData {
   def toScalaMap(map: ArrayBasedMapData): Map[Any, Any] = {
     val keys = map.keyArray.asInstanceOf[GenericArrayData].array
     val values = map.valueArray.asInstanceOf[GenericArrayData].array
-    keys.zip(values).toMap
+    Utils.toMap(keys, values)
   }
 
   def toScalaMap(keys: Array[Any], values: Array[Any]): Map[Any, Any] = {
-    keys.zip(values).toMap
+    Utils.toMap(keys, values)
   }
 
   def toScalaMap(keys: scala.collection.Seq[Any],
       values: scala.collection.Seq[Any]): Map[Any, Any] = {
-    keys.zip(values).toMap
+    Utils.toMap(keys, values)
   }
 
   def toJavaMap(keys: Array[Any], values: Array[Any]): java.util.Map[Any, Any] = {
-    import scala.collection.JavaConverters._
-    keys.zip(values).toMap.asJava
+    Utils.toJavaMap(keys, values)
   }
 }
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/RandomDataGenerator.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/RandomDataGenerator.scala
index 146c5e6f714cd..bff96019e97fb 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/RandomDataGenerator.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/RandomDataGenerator.scala
@@ -33,6 +33,7 @@ import org.apache.spark.sql.types._
 import org.apache.spark.sql.types.DayTimeIntervalType._
 import org.apache.spark.sql.types.YearMonthIntervalType.YEAR
 import org.apache.spark.unsafe.types.CalendarInterval
+import org.apache.spark.util.collection.Utils
 /**
  * Random data generators for Spark SQL DataTypes. These generators do not generate uniformly random
  * values; instead, they're biased to return "interesting" values (such as maximum / minimum values)
@@ -340,7 +341,7 @@ object RandomDataGenerator {
               count += 1
             }
             val values = Seq.fill(keys.size)(valueGenerator())
-            keys.zip(values).toMap
+            Utils.toMap(keys, values)
           }
         }
       case StructType(fields) =>
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/ExistingRDD.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/ExistingRDD.scala
index 0ce139baac109..3acadee5fb451 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/ExistingRDD.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/ExistingRDD.scala
@@ -26,6 +26,7 @@ import org.apache.spark.sql.catalyst.plans.logical._
 import org.apache.spark.sql.catalyst.plans.physical.{Partitioning, PartitioningCollection, UnknownPartitioning}
 import org.apache.spark.sql.catalyst.util.truncatedString
 import org.apache.spark.sql.execution.metric.SQLMetrics
+import org.apache.spark.util.collection.Utils
 
 object ExternalRDD {
 
@@ -106,7 +107,7 @@ case class LogicalRDD(
     session :: originStats :: originConstraints :: Nil
 
   override def newInstance(): LogicalRDD.this.type = {
-    val rewrite = output.zip(output.map(_.newInstance())).toMap
+    val rewrite = Utils.toMap(output, output.map(_.newInstance()))
 
     val rewrittenPartitioning = outputPartitioning match {
       case p: Expression =>
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/AggUtils.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/AggUtils.scala
index 3e5846bcdfd77..0849ab59f64d0 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/AggUtils.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/AggUtils.scala
@@ -25,6 +25,7 @@ import org.apache.spark.sql.execution.SparkPlan
 import org.apache.spark.sql.execution.streaming._
 import org.apache.spark.sql.internal.SQLConf
 import org.apache.spark.util.Utils
+import org.apache.spark.util.collection.{Utils => CUtils}
 
 /**
  * Utility functions used by the query planner to convert our plan to new aggregation code path.
@@ -218,7 +219,7 @@ object AggUtils {
     }
 
     // 3. Create an Aggregate operator for partial aggregation (for distinct)
-    val distinctColumnAttributeLookup = distinctExpressions.zip(distinctAttributes).toMap
+    val distinctColumnAttributeLookup = CUtils.toMap(distinctExpressions, distinctAttributes)
     val rewrittenDistinctFunctions = functionsWithDistinct.map {
       // Children of an AggregateFunction with DISTINCT keyword has already
       // been evaluated. At here, we need to replace original children
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/command/AnalyzePartitionCommand.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/command/AnalyzePartitionCommand.scala
index 433f9fcdd0898..dc0857383e79b 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/command/AnalyzePartitionCommand.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/command/AnalyzePartitionCommand.scala
@@ -25,6 +25,7 @@ import org.apache.spark.sql.catalyst.catalog.CatalogTypes.TablePartitionSpec
 import org.apache.spark.sql.catalyst.expressions.{And, EqualTo, Literal}
 import org.apache.spark.sql.errors.QueryCompilationErrors
 import org.apache.spark.sql.util.PartitioningUtils
+import org.apache.spark.util.collection.Utils
 
 /**
  * Analyzes a given set of partitions to generate per-partition statistics, which will be used in
@@ -147,7 +148,7 @@ case class AnalyzePartitionCommand(
           r.get(i).toString
         }
       }
-      val spec = tableMeta.partitionColumnNames.zip(partitionColumnValues).toMap
+      val spec = Utils.toMap(tableMeta.partitionColumnNames, partitionColumnValues)
       val count = BigInt(r.getLong(partitionColumns.size))
       (spec, count)
     }.toMap
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala
index 53a34a8f5f153..eb37a27fd7ca3 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala
@@ -28,6 +28,7 @@ import org.apache.spark.sql.execution.datasources.DataSourceStrategy
 import org.apache.spark.sql.internal.SQLConf
 import org.apache.spark.sql.sources
 import org.apache.spark.sql.types.StructType
+import org.apache.spark.util.collection.Utils
 
 object PushDownUtils {
   /**
@@ -203,7 +204,7 @@ object PushDownUtils {
   def toOutputAttrs(
       schema: StructType,
       relation: DataSourceV2Relation): Seq[AttributeReference] = {
-    val nameToAttr = relation.output.map(_.name).zip(relation.output).toMap
+    val nameToAttr = Utils.toMap(relation.output.map(_.name), relation.output)
     val cleaned = CharVarcharUtils.replaceCharVarcharWithStringInSchema(schema)
     cleaned.toAttributes.map {
       // we have to keep the attribute id during transformation
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExecBase.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExecBase.scala
index 31b7df1abd012..0f19f14576b97 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExecBase.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExecBase.scala
@@ -26,6 +26,7 @@ import org.apache.spark.sql.catalyst.expressions.aggregate.AggregateExpression
 import org.apache.spark.sql.catalyst.plans.physical.{AllTuples, ClusteredDistribution, Distribution, Partitioning}
 import org.apache.spark.sql.execution.UnaryExecNode
 import org.apache.spark.sql.types._
+import org.apache.spark.util.collection.Utils
 
 /**
  * Holds common logic for window operators
@@ -69,7 +70,7 @@ trait WindowExecBase extends UnaryExecNode {
       // Results of window expressions will be on the right side of child's output
       BoundReference(child.output.size + i, e.dataType, e.nullable)
     }
-    val unboundToRefMap = expressions.zip(references).toMap
+    val unboundToRefMap = Utils.toMap(expressions, references)
     val patchedWindowExpression = windowExpression.map(_.transform(unboundToRefMap))
     UnsafeProjection.create(
       child.output ++ patchedWindowExpression,
diff --git a/streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverSchedulingPolicy.scala b/streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverSchedulingPolicy.scala
index ce89d62346797..02eee36d4bee6 100644
--- a/streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverSchedulingPolicy.scala
+++ b/streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverSchedulingPolicy.scala
@@ -22,6 +22,7 @@ import scala.collection.mutable
 
 import org.apache.spark.scheduler.{ExecutorCacheTaskLocation, TaskLocation}
 import org.apache.spark.streaming.receiver.Receiver
+import org.apache.spark.util.collection.Utils
 
 /**
  * A class that tries to schedule receivers with evenly distributed. There are two phases for
@@ -135,7 +136,7 @@ private[streaming] class ReceiverSchedulingPolicy {
       leastScheduledExecutors += executor
     }
 
-    receivers.map(_.streamId).zip(scheduledLocations.map(_.toSeq)).toMap
+    Utils.toMap(receivers.map(_.streamId), scheduledLocations.map(_.toSeq))
   }
 
   /**