feat(platform): add support for via nodes

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/GmsGraphQLEngine.java

@@ -878,7 +878,8 @@ private void configureQueryResolvers(final RuntimeWiring.Builder builder) {
                     "scrollAcrossEntities",
                     new ScrollAcrossEntitiesResolver(this.entityClient, this.viewService))
                 .dataFetcher(
-                    "searchAcrossLineage", new SearchAcrossLineageResolver(this.entityClient))
+                    "searchAcrossLineage",
+                    new SearchAcrossLineageResolver(this.entityClient, this.entityRegistry))
                 .dataFetcher(
                     "scrollAcrossLineage", new ScrollAcrossLineageResolver(this.entityClient))
                 .dataFetcher(

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/resolvers/BatchLoadUtils.java

@@ -28,8 +28,9 @@ public static CompletableFuture<List<Entity>> batchLoadEntitiesOfSameType(
                 .filter(entity -> entities.get(0).getClass().isAssignableFrom(entity.objectClass()))
                 .collect(Collectors.toList()));
 
-    final DataLoader loader = dataLoaderRegistry.getDataLoader(filteredEntity.name());
-    List keyList = new ArrayList();
+    final DataLoader<Object, Entity> loader =
+        dataLoaderRegistry.getDataLoader(filteredEntity.name());
+    List<Object> keyList = new ArrayList();
     for (Entity entity : entities) {
       keyList.add(filteredEntity.getKeyProvider().apply(entity));
     }

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/resolvers/search/SearchAcrossLineageResolver.java

@@ -2,7 +2,9 @@
 
 import static com.linkedin.datahub.graphql.resolvers.ResolverUtils.*;
 import static com.linkedin.datahub.graphql.resolvers.search.SearchUtils.*;
+import static com.linkedin.metadata.Constants.QUERY_ENTITY_NAME;
 
+import com.google.common.collect.ImmutableSet;
 import com.linkedin.common.urn.Urn;
 import com.linkedin.datahub.graphql.generated.EntityType;
 import com.linkedin.datahub.graphql.generated.FacetFilterInput;
@@ -14,31 +16,63 @@
 import com.linkedin.datahub.graphql.types.entitytype.EntityTypeMapper;
 import com.linkedin.datahub.graphql.types.mappers.UrnSearchAcrossLineageResultsMapper;
 import com.linkedin.entity.client.EntityClient;
+import com.linkedin.metadata.models.EntitySpec;
+import com.linkedin.metadata.models.registry.EntityRegistry;
 import com.linkedin.metadata.query.SearchFlags;
 import com.linkedin.metadata.query.filter.Filter;
+import com.linkedin.metadata.search.LineageSearchResult;
 import com.linkedin.r2.RemoteInvocationException;
+import graphql.VisibleForTesting;
 import graphql.schema.DataFetcher;
 import graphql.schema.DataFetchingEnvironment;
 import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.stream.Collectors;
 import javax.annotation.Nullable;
-import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 /** Resolver responsible for resolving 'searchAcrossEntities' field of the Query type */
 @Slf4j
-@RequiredArgsConstructor
 public class SearchAcrossLineageResolver
     implements DataFetcher<CompletableFuture<SearchAcrossLineageResults>> {
 
   private static final int DEFAULT_START = 0;
   private static final int DEFAULT_COUNT = 10;
 
+  private static final Set<String> TRANSIENT_ENTITIES = ImmutableSet.of(QUERY_ENTITY_NAME);
+
   private final EntityClient _entityClient;
 
+  private final EntityRegistry _entityRegistry;
+
+  @VisibleForTesting final Set<String> _allEntities;
+  private final List<String> _allowedEntities;
+
+  public SearchAcrossLineageResolver(EntityClient entityClient, EntityRegistry entityRegistry) {
+    this._entityClient = entityClient;
+    this._entityRegistry = entityRegistry;
+    this._allEntities =
+        entityRegistry.getEntitySpecs().values().stream()
+            .map(EntitySpec::getName)
+            .collect(Collectors.toSet());
+
+    this._allowedEntities =
+        this._allEntities.stream()
+            .filter(e -> !TRANSIENT_ENTITIES.contains(e))
+            .collect(Collectors.toList());
+  }
+
+  private List<String> getEntityNamesFromInput(List<EntityType> inputTypes) {
+    if (inputTypes != null && !inputTypes.isEmpty()) {
+      return inputTypes.stream().map(EntityTypeMapper::getName).collect(Collectors.toList());
+    } else {
+      return this._allowedEntities;
+    }
+  }
+
   @Override
   public CompletableFuture<SearchAcrossLineageResults> get(DataFetchingEnvironment environment)
       throws URISyntaxException {
@@ -50,12 +84,7 @@ public CompletableFuture<SearchAcrossLineageResults> get(DataFetchingEnvironment
 
     final LineageDirection lineageDirection = input.getDirection();
 
-    List<EntityType> entityTypes =
-        (input.getTypes() == null || input.getTypes().isEmpty())
-            ? SEARCHABLE_ENTITY_TYPES
-            : input.getTypes();
-    List<String> entityNames =
-        entityTypes.stream().map(EntityTypeMapper::getName).collect(Collectors.toList());
+    List<String> entityNames = getEntityNamesFromInput(input.getTypes());
 
     // escape forward slash since it is a reserved character in Elasticsearch
     final String sanitizedQuery =
@@ -99,8 +128,7 @@ public CompletableFuture<SearchAcrossLineageResults> get(DataFetchingEnvironment
             } else {
               searchFlags = new SearchFlags().setFulltext(true).setSkipHighlighting(true);
             }
-
-            return UrnSearchAcrossLineageResultsMapper.map(
+            LineageSearchResult salResults =
                 _entityClient.searchAcrossLineage(
                     urn,
                     resolvedDirection,
@@ -114,7 +142,9 @@ public CompletableFuture<SearchAcrossLineageResults> get(DataFetchingEnvironment
                     startTimeMillis,
                     endTimeMillis,
                     searchFlags,
-                    ResolverUtils.getAuthentication(environment)));
+                    getAuthentication(environment));
+
+            return UrnSearchAcrossLineageResultsMapper.map(salResults);
           } catch (RemoteInvocationException e) {
             log.error(
                 "Failed to execute search across relationships: source urn {}, direction {}, entity types {}, query {}, filters: {}, start: {}, count: {}",

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/resolvers/search/SearchResolver.java

@@ -1,6 +1,7 @@
 package com.linkedin.datahub.graphql.resolvers.search;
 
 import static com.linkedin.datahub.graphql.resolvers.ResolverUtils.bindArgument;
+import static com.linkedin.metadata.Constants.*;
 import static com.linkedin.metadata.search.utils.SearchUtils.applyDefaultSearchFlags;
 
 import com.linkedin.datahub.graphql.generated.SearchInput;
@@ -10,6 +11,9 @@
 import com.linkedin.datahub.graphql.types.entitytype.EntityTypeMapper;
 import com.linkedin.datahub.graphql.types.mappers.UrnSearchResultsMapper;
 import com.linkedin.entity.client.EntityClient;
+import com.linkedin.metadata.query.GroupingCriterion;
+import com.linkedin.metadata.query.GroupingCriterionArray;
+import com.linkedin.metadata.query.GroupingSpec;
 import com.linkedin.metadata.query.SearchFlags;
 import graphql.schema.DataFetcher;
 import graphql.schema.DataFetchingEnvironment;
@@ -28,7 +32,14 @@ public class SearchResolver implements DataFetcher<CompletableFuture<SearchResul
           .setMaxAggValues(20)
           .setSkipCache(false)
           .setSkipAggregates(false)
-          .setSkipHighlighting(false);
+          .setSkipHighlighting(false)
+          .setGroupingSpec(
+              new GroupingSpec()
+                  .setGroupingCriteria(
+                      new GroupingCriterionArray(
+                          new GroupingCriterion()
+                              .setBaseEntityType(SCHEMA_FIELD_ENTITY_NAME)
+                              .setGroupingEntityType(DATASET_ENTITY_NAME))));
   private static final int DEFAULT_START = 0;
   private static final int DEFAULT_COUNT = 10;
 

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/common/mappers/GroupingCriterionInputMapper.java

@@ -0,0 +1,29 @@
+package com.linkedin.datahub.graphql.types.common.mappers;
+
+import com.linkedin.data.template.SetMode;
+import com.linkedin.datahub.graphql.generated.GroupingCriterion;
+import com.linkedin.datahub.graphql.types.entitytype.EntityTypeMapper;
+import com.linkedin.datahub.graphql.types.mappers.ModelMapper;
+import javax.annotation.Nonnull;
+
+public class GroupingCriterionInputMapper
+    implements ModelMapper<GroupingCriterion, com.linkedin.metadata.query.GroupingCriterion> {
+
+  public static final GroupingCriterionInputMapper INSTANCE = new GroupingCriterionInputMapper();
+
+  public static com.linkedin.metadata.query.GroupingCriterion map(
+      @Nonnull final GroupingCriterion groupingCriterion) {
+    return INSTANCE.apply(groupingCriterion);
+  }
+
+  @Override
+  public com.linkedin.metadata.query.GroupingCriterion apply(GroupingCriterion input) {
+    return new com.linkedin.metadata.query.GroupingCriterion()
+        .setBaseEntityType(
+            input.getBaseEntityType() != null
+                ? EntityTypeMapper.getName(input.getBaseEntityType())
+                : null,
+            SetMode.REMOVE_OPTIONAL_IF_NULL)
+        .setGroupingEntityType(EntityTypeMapper.getName(input.getGroupingEntityType()));
+  }
+}

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/common/mappers/SearchFlagsInputMapper.java

@@ -2,6 +2,9 @@
 
 import com.linkedin.datahub.graphql.generated.SearchFlags;
 import com.linkedin.datahub.graphql.types.mappers.ModelMapper;
+import com.linkedin.metadata.query.GroupingCriterionArray;
+import com.linkedin.metadata.query.GroupingSpec;
+import java.util.stream.Collectors;
 import javax.annotation.Nonnull;
 
 /**
@@ -42,6 +45,16 @@ public com.linkedin.metadata.query.SearchFlags apply(@Nonnull final SearchFlags
     if (searchFlags.getGetSuggestions() != null) {
       result.setGetSuggestions(searchFlags.getGetSuggestions());
     }
+    if (searchFlags.getGroupingSpec() != null
+        && searchFlags.getGroupingSpec().getGroupingCriteria() != null) {
+      result.setGroupingSpec(
+          new GroupingSpec()
+              .setGroupingCriteria(
+                  new GroupingCriterionArray(
+                      searchFlags.getGroupingSpec().getGroupingCriteria().stream()
+                          .map(GroupingCriterionInputMapper::map)
+                          .collect(Collectors.toList()))));
+    }
     return result;
   }
 }

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/common/mappers/UrnToEntityMapper.java

@@ -30,6 +30,7 @@
 import com.linkedin.datahub.graphql.generated.MLPrimaryKey;
 import com.linkedin.datahub.graphql.generated.Notebook;
 import com.linkedin.datahub.graphql.generated.OwnershipTypeEntity;
+import com.linkedin.datahub.graphql.generated.QueryEntity;
 import com.linkedin.datahub.graphql.generated.Role;
 import com.linkedin.datahub.graphql.generated.SchemaFieldEntity;
 import com.linkedin.datahub.graphql.generated.StructuredPropertyEntity;
@@ -198,6 +199,11 @@ public Entity apply(Urn input) {
       ((StructuredPropertyEntity) partialEntity).setUrn(input.toString());
       ((StructuredPropertyEntity) partialEntity).setType(EntityType.STRUCTURED_PROPERTY);
     }
+    if (input.getEntityType().equals(QUERY_ENTITY_NAME)) {
+      partialEntity = new QueryEntity();
+      ((QueryEntity) partialEntity).setUrn(input.toString());
+      ((QueryEntity) partialEntity).setType(EntityType.QUERY);
+    }
     return partialEntity;
   }
 }

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/mappers/UrnSearchAcrossLineageResultsMapper.java

@@ -62,6 +62,7 @@ private SearchAcrossLineageResult mapResult(LineageSearchEntity searchEntity) {
         .setMatchedFields(getMatchedFieldEntry(searchEntity.getMatchedFields()))
         .setPaths(searchEntity.getPaths().stream().map(this::mapPath).collect(Collectors.toList()))
         .setDegree(searchEntity.getDegree())
+        .setDegrees(searchEntity.getDegrees().stream().collect(Collectors.toList()))
         .build();
   }
 

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/query/QueryType.java

@@ -21,7 +21,9 @@
 import java.util.stream.Collectors;
 import javax.annotation.Nonnull;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
+@Slf4j
 @RequiredArgsConstructor
 public class QueryType
     implements com.linkedin.datahub.graphql.types.EntityType<QueryEntity, String> {
@@ -50,6 +52,7 @@ public List<DataFetcherResult<QueryEntity>> batchLoad(
     final List<Urn> viewUrns = urns.stream().map(UrnUtils::getUrn).collect(Collectors.toList());
 
     try {
+      log.debug("Fetching query entities: {}", viewUrns);
       final Map<Urn, EntityResponse> entities =
           _entityClient.batchGetV2(
               QUERY_ENTITY_NAME,

datahub-graphql-core/src/main/resources/entity.graphql

@@ -10948,6 +10948,11 @@ enum QuerySource {
   The query was provided manually, e.g. from the UI.
   """
   MANUAL
+
+  """
+  The query was extracted by the system, e.g. from a dashboard.
+  """
+  SYSTEM
 }
 
 """

datahub-graphql-core/src/main/resources/search.graphql

@@ -143,6 +143,15 @@ input  SearchFlags {
   Whether to request for search suggestions on the _entityName virtualized field
   """
   getSuggestions: Boolean
+
+  """
+  Additional grouping specifications to apply to the search results
+  Grouping specifications will control how search results are grouped together
+  in the response. This is currently being used to group schema fields (columns)
+  as datasets, and in the future will be used to group other entities as well.
+  Note: This is an experimental feature and is subject to change.
+  """
+  groupingSpec: GroupingSpec
 }
 
 """
@@ -278,6 +287,7 @@ input ScrollAcrossEntitiesInput {
   searchFlags: SearchFlags
 }
 
+
 """
 Input arguments for a search query over the results of a multi-hop graph query
 """
@@ -669,6 +679,12 @@ type SearchAcrossLineageResult {
   Degree of relationship (number of hops to get to entity)
   """
   degree: Int!
+
+  """
+  Degrees of relationship (for entities discoverable at multiple degrees)
+  """
+  degrees: [Int!]
+
 }
 
 """
@@ -1303,4 +1319,37 @@ input SortCriterion {
   The order in which we will be sorting
   """
   sortOrder: SortOrder!
+}
+
+"""
+A grouping specification for search results.
+"""
+input GroupingSpec {
+
+  """
+  A list of grouping criteria for grouping search results.
+  There is no implied order in the grouping criteria.
+  """
+  groupingCriteria: [GroupingCriterion!]
+
+}
+
+"""
+A single grouping criterion for grouping search results
+"""
+input GroupingCriterion {
+
+  """
+  The base entity type that needs to be grouped
+  e.g. schemaField
+  Omitting this field will result in all base entities being grouped into the groupingEntityType.
+  """
+  baseEntityType: EntityType
+
+  """
+  The type of entity being grouped into
+  e.g. dataset, domain, etc.
+  """
+  groupingEntityType: EntityType!
+
 }