public DualKeyCacheBuilder<FK, SK, V> memoryCapacity(long memoryCapacity) {
    this.memoryCapacity = memoryCapacity;
    return this;
  }
Define the memory capacity of dual key cache.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/analyze/cache/schema/dualkeycache/impl/DualKeyCacheBuilder.java