executor/infoschema_reader: exclude virtual schema in TIKV_REGION_STATUS (#61068)

close #59698

Author: sriramrajendiran

pkg/executor/infoschema_cluster_table_test.go

@@ -365,6 +365,9 @@ func TestTikvRegionStatus(t *testing.T) {
 		"1 test test_t2 1 p_a 1 p1",
 		"1 test test_t2 1 p_b 0 <nil>",
 	))
+
+	// Run the query to ensure virtual schemas are excluded and expect no rows to be returned
+	tk.MustQuery(`SELECT DB_NAME FROM information_schema.TIKV_REGION_STATUS WHERE DB_NAME IN ('INFORMATION_SCHEMA', 'METRICS_SCHEMA', 'PERFORMANCE_SCHEMA')`).Check(testkit.Rows())
 }
 
 func TestTableStorageStats(t *testing.T) {

pkg/executor/infoschema_reader.go

@@ -2101,6 +2101,10 @@ func (e *memtableRetriever) setDataForTiKVRegionStatus(ctx context.Context, sctx
 			e.setNewTiKVRegionStatusCol(&allRegionsInfo.Regions[i], nil)
 		}
 		for j, regionTable := range regionTableList {
+			// Exclude virtual schemas
+			if util.IsMemDB(regionTable.DB.Name.L) {
+				continue
+			}
 			if checker != nil && !checker.RequestVerification(sctx.GetSessionVars().ActiveRoles, regionTable.DB.Name.L, regionTable.Table.Name.L, "", mysql.AllPrivMask) {
 				continue
 			}