optimizing current runs query for lieage api

Signed-off-by: Prachi Mishra <prachi.mishra@astronomer.io>

api/src/main/java/marquez/db/LineageDao.java

@@ -92,42 +92,11 @@ WHERE ds.uuid IN (<dsUuids>)""")
   Optional<UUID> getJobFromInputOrOutput(String datasetName, String namespaceName);
 
   @SqlQuery(
-      "WITH latest_runs AS (\n"
-          + "    SELECT DISTINCT on(r.job_name, r.namespace_name) r.*, jv.version\n"
+      "SELECT DISTINCT on(r.job_name, r.namespace_name) r.*, jv.version as job_version\n"
           + "    FROM runs_view r\n"
           + "    INNER JOIN job_versions jv ON jv.uuid=r.job_version_uuid\n"
           + "    INNER JOIN jobs_view j ON j.uuid=jv.job_uuid\n"
           + "    WHERE j.uuid in (<jobUuid>) OR j.symlink_target_uuid IN (<jobUuid>)\n"
-          + "    ORDER BY r.job_name, r.namespace_name, created_at DESC\n"
-          + ")\n"
-          + "SELECT r.*, ra.args, ctx.context, f.facets,\n"
-          + "  r.version AS job_version, ri.input_versions, ro.output_versions\n"
-          + "  from latest_runs AS r\n"
-          + "LEFT JOIN run_args AS ra ON ra.uuid = r.run_args_uuid\n"
-          + "LEFT JOIN job_contexts AS ctx ON r.job_context_uuid = ctx.uuid\n"
-          + "LEFT JOIN LATERAL (\n"
-          + "    SELECT le.run_uuid, JSON_AGG(event->'run'->'facets') AS facets\n"
-          + "    FROM lineage_events le\n"
-          + "    WHERE le.run_uuid=r.uuid\n"
-          + "    GROUP BY le.run_uuid\n"
-          + ") AS f ON r.uuid=f.run_uuid\n"
-          + "LEFT JOIN LATERAL (\n"
-          + "    SELECT im.run_uuid,\n"
-          + "           JSON_AGG(json_build_object('namespace', dv.namespace_name,\n"
-          + "                                      'name', dv.dataset_name,\n"
-          + "                                      'version', dv.version)) AS input_versions\n"
-          + "    FROM runs_input_mapping im\n"
-          + "    INNER JOIN dataset_versions dv on im.dataset_version_uuid = dv.uuid\n"
-          + "    WHERE im.run_uuid=r.uuid\n"
-          + "    GROUP BY im.run_uuid\n"
-          + ") ri ON ri.run_uuid=r.uuid\n"
-          + "LEFT JOIN LATERAL (\n"
-          + "    SELECT run_uuid, JSON_AGG(json_build_object('namespace', namespace_name,\n"
-          + "                                                'name', dataset_name,\n"
-          + "                                                'version', version)) AS output_versions\n"
-          + "    FROM dataset_versions\n"
-          + "    WHERE run_uuid=r.uuid\n"
-          + "    GROUP BY run_uuid\n"
-          + ") ro ON ro.run_uuid=r.uuid")
+          + "    ORDER BY r.job_name, r.namespace_name, created_at DESC")
   List<Run> getCurrentRuns(@BindList Collection<UUID> jobUuid);
 }

api/src/main/java/marquez/db/mappers/RunMapper.java

@@ -17,6 +17,7 @@
 
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.time.Instant;
@@ -71,7 +72,7 @@ public Run map(@NonNull ResultSet results, @NonNull StatementContext context)
             ? timestampOrNull(results, columnPrefix + Columns.ENDED_AT)
             : null,
         durationMs.orElse(null),
-        toArgs(results, columnPrefix + Columns.ARGS),
+        toArgsOrNull(results, columnPrefix + Columns.ARGS),
         stringOrThrow(results, columnPrefix + Columns.NAMESPACE_NAME),
         stringOrThrow(results, columnPrefix + Columns.JOB_NAME),
         uuidOrNull(results, columnPrefix + Columns.JOB_VERSION),
@@ -82,7 +83,9 @@ public Run map(@NonNull ResultSet results, @NonNull StatementContext context)
         columnNames.contains(columnPrefix + Columns.OUTPUT_VERSIONS)
             ? toDatasetVersion(results, columnPrefix + Columns.OUTPUT_VERSIONS)
             : ImmutableList.of(),
-        JobMapper.toContext(results, columnPrefix + Columns.CONTEXT),
+        columnNames.contains(columnPrefix + Columns.CONTEXT)
+            ? JobMapper.toContext(results, columnPrefix + Columns.CONTEXT)
+            : null,
         toFacetsOrNull(results, columnPrefix + Columns.FACETS));
   }
 
@@ -94,8 +97,12 @@ private List<DatasetVersionId> toDatasetVersion(ResultSet rs, String column) thr
     return Utils.fromJson(dsString, new TypeReference<List<DatasetVersionId>>() {});
   }
 
-  private Map<String, String> toArgs(ResultSet results, String column) throws SQLException {
-    String args = stringOrNull(results, column);
+  private Map<String, String> toArgsOrNull(ResultSet results, String argsColumn)
+      throws SQLException {
+    if (!Columns.exists(results, argsColumn)) {
+      return ImmutableMap.of();
+    }
+    String args = stringOrNull(results, argsColumn);
     if (args == null) {
       return null;
     }

api/src/test/java/marquez/service/LineageServiceTest.java

@@ -158,9 +158,6 @@ public void testLineage() {
     runAssert
         .extracting(Run::getInputVersions, InstanceOfAssertFactories.list(DatasetVersionId.class))
         .hasSize(0);
-    runAssert
-        .extracting(Run::getOutputVersions, InstanceOfAssertFactories.list(DatasetVersionId.class))
-        .hasSize(1);
 
     // check the output edges for the commonDataset node
     assertThat(lineage.getGraph())
@@ -266,9 +263,6 @@ public void testLineageWithDeletedDataset() {
     runAssert
         .extracting(Run::getInputVersions, InstanceOfAssertFactories.list(DatasetVersionId.class))
         .hasSize(0);
-    runAssert
-        .extracting(Run::getOutputVersions, InstanceOfAssertFactories.list(DatasetVersionId.class))
-        .hasSize(1);
 
     // check the output edges for the commonDataset node
     assertThat(lineage.getGraph())