expr: fix copr-test (pingcap#32740)

ref pingcap#32739

cmd/explaintest/r/index_merge.result

@@ -705,11 +705,11 @@ c1	c2	c3	c4	c5
 explain select /*+ use_index_merge(t1) */ * from t1 where (c1 < 10 or c2 < 10) and truncate(c1, 1) = 1 order by 1;
 id	estRows	task	access object	operator info
 Sort_5	4433.77	root		test.t1.c1
-└─IndexMerge_12	4433.77	root		
-  ├─IndexRangeScan_8(Build)	3323.33	cop[tikv]	table:t1, index:c1(c1)	range:[-inf,10), keep order:false, stats:pseudo
-  ├─IndexRangeScan_9(Build)	3323.33	cop[tikv]	table:t1, index:c2(c2)	range:[-inf,10), keep order:false, stats:pseudo
-  └─Selection_11(Probe)	4433.77	cop[tikv]		eq(truncate(test.t1.c1, 1), 1)
-    └─TableRowIDScan_10	5542.21	cop[tikv]	table:t1	keep order:false, stats:pseudo
+└─Selection_8	4433.77	root		eq(truncate(test.t1.c1, 1), 1)
+  └─IndexMerge_12	5542.21	root		
+    ├─IndexRangeScan_9(Build)	3323.33	cop[tikv]	table:t1, index:c1(c1)	range:[-inf,10), keep order:false, stats:pseudo
+    ├─IndexRangeScan_10(Build)	3323.33	cop[tikv]	table:t1, index:c2(c2)	range:[-inf,10), keep order:false, stats:pseudo
+    └─TableRowIDScan_11(Probe)	5542.21	cop[tikv]	table:t1	keep order:false, stats:pseudo
 select /*+ use_index_merge(t1) */ * from t1 where (c1 < 10 or c2 < 10) and truncate(c1, 1) = 1 order by 1;
 c1	c2	c3	c4	c5
 1	1	1	1	1

expression/distsql_builtin.go

@@ -229,6 +229,8 @@ func getSignatureByPB(ctx sessionctx.Context, sigCode tipb.ScalarFuncSig, tp *ti
 		f = &builtinGreatestCmpStringAsTimeSig{base, false}
 	case tipb.ScalarFuncSig_GreatestCmpStringAsDate:
 		f = &builtinGreatestCmpStringAsTimeSig{base, true}
+	case tipb.ScalarFuncSig_GreatestDuration:
+		f = &builtinGreatestDurationSig{base}
 	case tipb.ScalarFuncSig_LeastInt:
 		f = &builtinLeastIntSig{base}
 	case tipb.ScalarFuncSig_LeastReal:
@@ -245,6 +247,8 @@ func getSignatureByPB(ctx sessionctx.Context, sigCode tipb.ScalarFuncSig, tp *ti
 		f = &builtinLeastCmpStringAsTimeSig{base, false}
 	case tipb.ScalarFuncSig_LeastCmpStringAsDate:
 		f = &builtinLeastCmpStringAsTimeSig{base, true}
+	case tipb.ScalarFuncSig_LeastDuration:
+		f = &builtinLeastDurationSig{base}
 	case tipb.ScalarFuncSig_IntervalInt:
 		f = &builtinIntervalIntSig{base, false} // Since interval function won't be pushed down to TiKV, therefore it doesn't matter what value we give to hasNullable
 	case tipb.ScalarFuncSig_IntervalReal:

expression/expr_to_pb_test.go

@@ -1263,11 +1263,11 @@ func TestExprPushDownToTiKV(t *testing.T) {
 			retType:      types.NewFieldType(mysql.TypeDouble),
 			args:         []Expression{intColumn},
 		},
-		{
-			functionName: ast.Truncate,
-			retType:      types.NewFieldType(mysql.TypeDouble),
-			args:         []Expression{intColumn, intColumn},
-		},
+		//{
+		//	functionName: ast.Truncate,
+		//	retType:      types.NewFieldType(mysql.TypeDouble),
+		//	args:         []Expression{intColumn, intColumn},
+		//},
 		{
 			functionName: ast.Bin,
 			retType:      types.NewFieldType(mysql.TypeString),

expression/expression.go

@@ -953,7 +953,7 @@ func scalarExprSupportedByTiKV(sf *ScalarFunction) bool {
 		ast.Greatest, ast.Least, /* ast.Interval */
 
 		// arithmetical functions.
-		ast.PI, ast.Truncate,
+		ast.PI, /* ast.Truncate */
 		ast.Plus, ast.Minus, ast.Mul, ast.Div, ast.Abs, ast.Mod,
 
 		// math functions.
@@ -989,11 +989,11 @@ func scalarExprSupportedByTiKV(sf *ScalarFunction) bool {
 		ast.MonthName, ast.MakeDate, ast.TimeToSec, ast.MakeTime,
 		ast.DateFormat,
 		ast.Hour, ast.Minute, ast.Second, ast.MicroSecond, ast.Month,
-		ast.DayName, ast.DayOfMonth, ast.DayOfWeek, ast.DayOfYear,
+		/* ast.DayName */ ast.DayOfMonth, ast.DayOfWeek, ast.DayOfYear,
 		ast.Weekday, ast.WeekOfYear, ast.Year,
 		ast.FromDays, ast.ToDays,
 		ast.PeriodAdd, ast.PeriodDiff, /*ast.TimestampDiff, ast.DateAdd, ast.FromUnixTime,*/
-		ast.LastDay,
+		/* ast.LastDay */
 		ast.Sysdate,
 
 		// encryption functions.

planner/core/integration_test.go

@@ -2778,9 +2778,9 @@ func TestScalarFunctionPushDown(t *testing.T) {
 	tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where month(d);").
 		CheckAt([]int{0, 3, 6}, rows)
 
-	rows[1][2] = "dayname(test.t.d)"
-	tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where dayname(d);").
-		CheckAt([]int{0, 3, 6}, rows)
+	//rows[1][2] = "dayname(test.t.d)"
+	//tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where dayname(d);").
+	//	CheckAt([]int{0, 3, 6}, rows)
 
 	rows[1][2] = "dayofmonth(test.t.d)"
 	tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where dayofmonth(d);").
@@ -2802,17 +2802,17 @@ func TestScalarFunctionPushDown(t *testing.T) {
 	tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where to_days(d);").
 		CheckAt([]int{0, 3, 6}, rows)
 
-	rows[1][2] = "last_day(test.t.d)"
-	tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where last_day(d);").
-		CheckAt([]int{0, 3, 6}, rows)
+	//rows[1][2] = "last_day(test.t.d)"
+	//tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where last_day(d);").
+	//	CheckAt([]int{0, 3, 6}, rows)
 
 	rows[1][2] = "gt(4, test.t.id)"
 	tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where pi() > id;").
 		CheckAt([]int{0, 3, 6}, rows)
 
-	rows[1][2] = "truncate(test.t.id, 0)"
-	tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where truncate(id,0)").
-		CheckAt([]int{0, 3, 6}, rows)
+	//rows[1][2] = "truncate(test.t.id, 0)"
+	//tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where truncate(id,0)").
+	//	CheckAt([]int{0, 3, 6}, rows)
 
 	rows[1][2] = "bin(test.t.id)"
 	tk.MustQuery("explain analyze select /*+read_from_storage(tikv[t])*/ * from t where bin(id)").