How to use org.apache.kylin.storage

public static IStorageQuery createQuery(IRealization realization) {
  return storage(realization).createQuery(realization);
}

/**
 * in contrast to the limit in SQL concept, "limit push down" means
 * whether the limit is effective in storage level. Some queries are not possible 
 * to leverage limit clause, checkout 
 * {@link GTCubeStorageQueryBase#enableStorageLimitIfPossible(org.apache.kylin.cube.cuboid.Cuboid, java.util.Collection, java.util.Set, java.util.Collection, org.apache.kylin.metadata.filter.TupleFilter, java.util.Set, java.util.Collection, org.apache.kylin.storage.StorageContext)}
 */
public boolean isLimitPushDownEnabled() {
  return isValidPushDownLimit(finalPushDownLimit);
}

public static <T> T createEngineAdapter(IStorageAware aware, Class<T> engineInterface) {
  return storage(aware).adaptToBuildEngine(engineInterface);
}

public HybridStorageQuery(HybridInstance hybridInstance) {
  this.realizations = hybridInstance.getRealizations();
  storageEngines = new IStorageQuery[realizations.length];
  for (int i = 0; i < realizations.length; i++) {
    storageEngines[i] = StorageFactory.createQuery(realizations[i]);
  }
}

  @Override
  public void run() {
    s[1] = StorageFactory.storage(new MockupStorageAware());
  }
});

public static IMRBatchCubingOutputSide2 getBatchCubingOutputSide2(CubeSegment seg) {
  return StorageFactory.createEngineAdapter(seg, IMROutput2.class).getBatchCubingOutputSide(seg);
}

private ITupleIterator queryStorage() {
  logger.debug("query storage...");
  // bind dynamic variables
  olapContext.bindVariable(optiqContext);
  olapContext.resetSQLDigest();
  SQLDigest sqlDigest = olapContext.getSQLDigest();
  // query storage engine
  IStorageQuery storageEngine = StorageFactory.createQuery(olapContext.realization);
  ITupleIterator iterator = storageEngine.search(olapContext.storageContext, sqlDigest,
      olapContext.returnTupleInfo);
  if (logger.isDebugEnabled()) {
    logger.debug("return TupleIterator...");
  }
  return iterator;
}

public StorageResponseGTScatter(GTScanRequest scanRequest, IPartitionStreamer partitionStreamer,
    StorageContext context) {
  this.info = scanRequest.getInfo();
  this.partitionStreamer = partitionStreamer;
  this.blocks = partitionStreamer.asByteArrayIterator();
  this.columns = scanRequest.getColumns();
  this.groupByDims = scanRequest.getAggrGroupBy();
  this.needSorted = (context.getFinalPushDownLimit() != Integer.MAX_VALUE) || context.isStreamAggregateEnabled();
}

  public TupleFilter buildOrFilter(List<TblColRef> columns) {
    CompareTupleFilter compareFilter1 = buildFilter1(columns.get(0));
    CompareTupleFilter compareFilter2 = buildFilter2(columns.get(1));
    LogicalTupleFilter logicFilter = new LogicalTupleFilter(TupleFilter.FilterOperatorEnum.OR);
    logicFilter.addChild(compareFilter1);
    logicFilter.addChild(compareFilter2);
    return logicFilter;
  }
}

public boolean mergeSortPartitionResults() {
  return mergeSortPartitionResults(finalPushDownLimit);
}

private void flushScanCountDelta() {
  context.increaseProcessedRowCount(scanCountDelta);
  scanCountDelta = 0;
}

  @Override
  public void run() {
    s[0] = StorageFactory.storage(new MockupStorageAware());
  }
});

public static IMROutput2.IMRBatchOptimizeOutputSide2 getBatchOptimizeOutputSide2(CubeSegment seg) {
  return StorageFactory.createEngineAdapter(seg, IMROutput2.class).getBatchOptimizeOutputSide(seg);
}

public TupleFilter buildAndFilter(List<TblColRef> columns) {
  CompareTupleFilter compareFilter1 = buildFilter1(columns.get(0));
  CompareTupleFilter compareFilter2 = buildFilter2(columns.get(1));
  LogicalTupleFilter andFilter = new LogicalTupleFilter(TupleFilter.FilterOperatorEnum.AND);
  andFilter.addChild(compareFilter1);
  andFilter.addChild(compareFilter2);
  return andFilter;
}

public static boolean mergeSortPartitionResults(int finalPushDownLimit) {
  return isValidPushDownLimit(finalPushDownLimit);
}

@Test
public void testSingleThread() {
  IStorage s1 = StorageFactory.storage(new MockupStorageAware());
  IStorage s2 = StorageFactory.storage(new MockupStorageAware());
  Assert.assertSame(s1, s2);
}

public static ISparkOutput.ISparkBatchMergeOutputSide getBatchMergeOutputSide2(CubeSegment seg) {
  return StorageFactory.createEngineAdapter(seg, ISparkOutput.class).getBatchMergeOutputSide(seg);
}

public static IMRBatchMergeOutputSide2 getBatchMergeOutputSide2(CubeSegment seg) {
  return StorageFactory.createEngineAdapter(seg, IMROutput2.class).getBatchMergeOutputSide(seg);
}

public static IMROutput2.IMRBatchOptimizeOutputSide2 getBatchOptimizeOutputSide2(CubeSegment seg) {
  return StorageFactory.createEngineAdapter(seg, IMROutput2.class).getBatchOptimizeOutputSide(seg);
}

public static ISparkOutput.ISparkBatchCubingOutputSide getBatchCubingOutputSide(CubeSegment seg) {
  return StorageFactory.createEngineAdapter(seg, ISparkOutput.class).getBatchCubingOutputSide(seg);
}