Is this okay?

Is this okay?

https://github.com/apache/incubator-wayang/blob/b67b404ed7cc3349991844ab6b7b5c4af29c2574/wayang-api/wayang-api-scala-java/src/main/scala/org/apache/wayang/api/serialization/mixins/ConfigurationAndContextMixIns.scala#L49

```scala

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package org.apache.wayang.api.serialization.mixins

import com.fasterxml.jackson.annotation.{JsonIdentityInfo, JsonIgnore, JsonSubTypes, JsonTypeInfo, ObjectIdGenerators}
import org.apache.logging.log4j.Logger
import org.apache.wayang.api.{MultiContext, DataQuanta, PlanBuilder}
import org.apache.wayang.core.api.configuration.{CollectionProvider, ExplicitCollectionProvider, KeyValueProvider, MapBasedKeyValueProvider, ValueProvider}
import org.apache.wayang.core.function.FunctionDescriptor
import org.apache.wayang.core.mapping.Mapping
import org.apache.wayang.core.optimizer.ProbabilisticDoubleInterval
import org.apache.wayang.core.optimizer.cardinality.CardinalityEstimator
import org.apache.wayang.core.optimizer.channels.ChannelConversion
import org.apache.wayang.core.optimizer.costs.{LoadProfileEstimator, LoadProfileToTimeConverter, TimeToCostConverter}
import org.apache.wayang.core.optimizer.enumeration.PlanEnumerationPruningStrategy
import org.apache.wayang.core.plan.wayangplan.{ExecutionOperator, OutputSlot}
import org.apache.wayang.core.platform.Platform
import org.apache.wayang.core.profiling.{CardinalityRepository, InstrumentationStrategy}

import java.util.function.ToDoubleFunction

object ConfigurationAndContextMixIns {

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "@type")
@JsonSubTypes(Array(
new JsonSubTypes.Type(value = classOf[MultiContext], name = "MultiContext"),
))
abstract class WayangContextMixIn {
@JsonIgnore
private var logger: Logger = _

// TODO: Is this okay?
@JsonIgnore
private var cardinalityRepository: CardinalityRepository = _
}

@JsonIdentityInfo(generator = classOf[ObjectIdGenerators.IntSequenceGenerator], property = "@id")
abstract class ConfigurationMixIn {
@JsonIgnore
private var cardinalityEstimatorProvider: KeyValueProvider[OutputSlot[_], CardinalityEstimator] = _

@JsonIgnore
private var udfSelectivityProvider: KeyValueProvider[FunctionDescriptor, ProbabilisticDoubleInterval] = _

@JsonIgnore
private var operatorLoadProfileEstimatorProvider: KeyValueProvider[ExecutionOperator, LoadProfileEstimator] = _

@JsonIgnore
private var functionLoadProfileEstimatorProvider: KeyValueProvider[FunctionDescriptor, LoadProfileEstimator] = _

@JsonIgnore
private var loadProfileEstimatorCache: MapBasedKeyValueProvider[String, LoadProfileEstimator] = _

@JsonIgnore
private var loadProfileToTimeConverterProvider: KeyValueProvider[Platform, LoadProfileToTimeConverter] = _

@JsonIgnore
private var timeToCostConverterProvider: KeyValueProvider[Platform, TimeToCostConverter] = _

@JsonIgnore
private var costSquasherProvider: ValueProvider[ToDoubleFunction[ProbabilisticDoubleInterval]] = _

@JsonIgnore
private var platformStartUpTimeProvider: KeyValueProvider[Platform, Long] = _

@JsonIgnore
private var platformProvider: ExplicitCollectionProvider[Platform] = _

@JsonIgnore
private var mappingProvider: ExplicitCollectionProvider[Mapping] = _

@JsonIgnore
private var channelConversionProvider: ExplicitCollectionProvider[ChannelConversion] = _

@JsonIgnore
private var pruningStrategyClassProvider: CollectionProvider[Class[PlanEnumerationPruningStrategy]] = _

@JsonIgnore
private var instrumentationStrategyProvider: ValueProvider[InstrumentationStrategy] = _
}

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "@type")
@JsonSubTypes(Array(
new JsonSubTypes.Type(value = classOf[MultiContext.TextFileSink], name = "MultiContextTextFileSink"),
new JsonSubTypes.Type(value = classOf[MultiContext.ObjectFileSink], name = "MultiContextObjectFileSink"
))
)
abstract class MultiContextUnarySinkMixIn {
}

abstract class MultiContextPlanBuilderMixIn {
@JsonIgnore
private var multiContextMap: Map[Long, MultiContext] = _

@JsonIgnore
private var dataQuantaMap: Map[Long, DataQuanta[_]] = _

@JsonIgnore
private var planBuilderMap: Map[Long, PlanBuilder] = _
}

}

```

2c95d92ffed3267f43f23d0a9bfb1ca404e85775

Start at wayang-api/wayang-api-scala-java/src/main/scala/org/apache/wayang/api/serialization/mixins/ConfigurationAndContextMixIns.scala near line 49 and inspect the WayangContextMixIn cardinalityRepository field and its JsonIgnore annotation. Determine whether that field should participate in serialization; the issue is complete when the expected serialization behavior and any required code change are established.

Written by the indexing model from the issue text.