How to use

dropStorageFromFact

method

in

org.apache.lens.cube.metadata.CubeMetastoreClient

@Override
public void dropAllStoragesOfFact(LensSessionHandle sessionid, String factName) throws LensException {
 try (SessionContext ignored = new SessionContext(sessionid)){
  CubeMetastoreClient msClient = getClient(sessionid);
  CubeFactTable tab = msClient.getCubeFactTable(factName);
  int total = tab.getStorages().size();
  int i = 0;
  List<String> storageNames = new ArrayList<>(tab.getStorages());
  for (String s : storageNames) {
   msClient.dropStorageFromFact(factName, s);
   log.info("Dropped storage " + s + " from fact table " + factName
    + " [" + ++i + "/" + total + "]");
  }
  log.info("Dropped " + total + " storages from fact table " + factName);
 }
}

@Override
public void dropStorageOfFact(LensSessionHandle sessionid, String fact, String storage) throws LensException {
 try (SessionContext ignored = new SessionContext(sessionid)){
  checkFactStorage(sessionid, fact, storage);
  getClient(sessionid).dropStorageFromFact(fact, storage);
  log.info("Dropped storage " + storage + " from fact " + fact);
 } catch (HiveException exc) {
  throw new LensException(exc);
 }
}

/**
 * Drop a fact with cascade  flag
 *
 * @param factName fact name
 * @param cascade  If true, will drop all the storages of the fact
 * @throws LensException
 */
public void dropFact(String factName, boolean cascade) throws LensException {
 getTableWithTypeFailFast(factName, CubeTableType.FACT);
 FactTable fact = getFactTable(factName);
 if (cascade) {
  for (String storage : fact.getStorages()) {
   dropStorageFromFact(factName, storage, false);
  }
 }
 dropHiveTable(factName);
 allFactTables.remove(factName.trim().toLowerCase());
 if (fact.isVirtualFact()) {
  String sourceFactTable = fact.getProperties().get(getSourceFactNameKey(fact.getName()));
  if (factToVirtualFactMapping.get(sourceFactTable) != null
   && factToVirtualFactMapping.get(sourceFactTable).contains(fact.getName())) {
   factToVirtualFactMapping.get(sourceFactTable).remove(fact.getName());
  }
 } else {
  dropAllVirtualFactTables(factName);
 }
}

/**
 * Drop a fact with cascade  flag
 *
 * @param factName fact name
 * @param cascade  If true, will drop all the storages of the fact
 * @throws LensException
 */
public void dropFact(String factName, boolean cascade) throws LensException {
 getTableWithTypeFailFast(factName, CubeTableType.FACT);
 FactTable fact = getFactTable(factName);
 checkIfAuthorized();
 if (cascade) {
  for (String storage : fact.getStorages()) {
   dropStorageFromFact(factName, storage, false);
  }
 }
 dropHiveTable(factName);
 allFactTables.remove(factName.trim().toLowerCase());
 if (fact.isVirtualFact()) {
  String sourceFactTable = fact.getProperties().get(getSourceFactNameKey(fact.getName()));
  if (factToVirtualFactMapping.get(sourceFactTable) != null
   && factToVirtualFactMapping.get(sourceFactTable).contains(fact.getName())) {
   factToVirtualFactMapping.get(sourceFactTable).remove(fact.getName());
  }
 } else {
  dropAllVirtualFactTables(factName);
 }
}

String storageTableName = getFactOrDimtableStorageTableName(factName, c3);
assertTrue(client.tableExists(storageTableName));
client.dropStorageFromFact(factName, c2);
storageTableName = getFactOrDimtableStorageTableName(factName, c2);
assertFalse(client.tableExists(storageTableName));