Make column-prune not effective for InformationSchemaTableScanNode

Author: Wei-hao-Li

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/iterative/rule/PruneTableScanColumns.java

@@ -102,15 +102,10 @@ public static Optional<PlanNode> pruneColumns(TableScanNode node, Set<Symbol> re
               deviceTableScanNode.getPushDownOffset(),
               deviceTableScanNode.isPushLimitToEachDevice()));
     } else if (node instanceof InformationSchemaTableScanNode) {
-      return Optional.of(
-          new InformationSchemaTableScanNode(
-              node.getPlanNodeId(),
-              node.getQualifiedObjectName(),
-              newOutputs,
-              newAssignments,
-              node.getPushDownPredicate(),
-              node.getPushDownLimit(),
-              node.getPushDownOffset()));
+      // For the convenience of process in execution stage, column-prune for
+      // InformationSchemaTableScanNode is
+      // not supported now.
+      return Optional.empty();
     } else {
       throw new UnsupportedOperationException(
           "Unknown TableScanNode type: " + node.getClass().getSimpleName());

iotdb-core/datanode/src/test/java/org/apache/iotdb/db/queryengine/plan/relational/analyzer/ShowQueriesTest.java

@@ -40,6 +40,7 @@
 import static org.apache.iotdb.db.queryengine.plan.relational.planner.assertions.PlanMatchPattern.mergeSort;
 import static org.apache.iotdb.db.queryengine.plan.relational.planner.assertions.PlanMatchPattern.offset;
 import static org.apache.iotdb.db.queryengine.plan.relational.planner.assertions.PlanMatchPattern.output;
+import static org.apache.iotdb.db.queryengine.plan.relational.planner.assertions.PlanMatchPattern.project;
 import static org.apache.iotdb.db.queryengine.plan.relational.planner.assertions.PlanMatchPattern.sort;
 
 public class ShowQueriesTest {
@@ -118,4 +119,24 @@ public void testSort() {
         planTester.getFragmentPlan(2),
         sort(infoSchemaTableScan("information_schema.queries", Optional.of(2))));
   }
+
+  @Test
+  public void testNonSelectAll() {
+    // Optimizer column-prune for InformationSchemaTableScanNode is not supported now.
+    LogicalQueryPlan logicalQueryPlan =
+        planTester.createPlan("select query_id from information_schema.queries");
+    assertPlan(
+        logicalQueryPlan,
+        output(
+            project(
+                infoSchemaTableScan(
+                    "information_schema.queries",
+                    Optional.empty(),
+                    ImmutableList.of(
+                        QUERY_ID_TABLE_MODEL,
+                        START_TIME_TABLE_MODEL,
+                        DATA_NODE_ID_TABLE_MODEL,
+                        ELAPSED_TIME_TABLE_MODEL,
+                        STATEMENT.toLowerCase(Locale.ENGLISH))))));
+  }
 }