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pingcap · Dec 12, 2022 · d6a2fc7 · d6a2fc7
1 parent c4aa395
commit d6a2fc7
Showing 1 changed file with 19 additions and 0 deletions.
diff --git a/planner/core/cbo_test.go b/planner/core/cbo_test.go
@@ -57,6 +57,25 @@ func loadTableStats(fileName string, dom *domain.Domain) error {
 	return nil
 }
 
+func TestExplainCostTrace(t *testing.T) {
+	store := testkit.CreateMockStore(t)
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	tk.MustExec("create table t (a int)")
+
+	tk.MustExec("set tidb_cost_model_version=2")
+	tk.MustQuery("explain format='cost_trace' select * from t").Check(testkit.Rows(
+		`TableReader_5 10000.00 177906.67 ((scan(10000*logrowsize(32)*tikv_scan_factor(40.7))) + (net(10000*rowsize(16)*tidb_kv_net_factor(3.96))))/15.00 root  data:TableFullScan_4`,
+		`└─TableFullScan_4 10000.00 2035000.00 scan(10000*logrowsize(32)*tikv_scan_factor(40.7)) cop[tikv] table:t keep order:false, stats:pseudo`))
+
+	tk.MustExec("set tidb_cost_model_version=1")
+	tk.MustQuery("explain format='cost_trace' select * from t").Check(testkit.Rows(
+		// cost trace on model ver1 is not supported
+		`TableReader_5 10000.00 34418.00 N/A root  data:TableFullScan_4`,
+		`└─TableFullScan_4 10000.00 435000.00 N/A cop[tikv] table:t keep order:false, stats:pseudo`,
+	))
+}
+
 func TestExplainAnalyze(t *testing.T) {
 	store := testkit.CreateMockStore(t)
 	tk := testkit.NewTestKit(t, store)