Fix float to bigint conversion result

enginetest/queries/alter_table_queries.go

@@ -1006,6 +1006,29 @@ var AlterTableScripts = []ScriptTest{
 			},
 		},
 	},
+	{
+		// https://github.com/dolthub/dolt/issues/9178
+		Name: "alter modify column type float to bigint",
+		SetUpScript: []string{
+			"create table t1 (pk int primary key, c1 float);",
+			"insert into t1 values (1, 0.0)",
+			"insert into t1 values (2, 127.9)",
+			"insert into t1 values (3, 42.1)",
+		},
+		Assertions: []ScriptTestAssertion{
+			{
+				Query: "alter table t1 modify column c1 bigint",
+			},
+			{
+				Query: "select * from t1 order by pk",
+				Expected: []sql.Row{
+					{1, int64(0)},
+					{2, int64(128)},
+					{3, int64(42)},
+				},
+			},
+		},
+	},
 }
 
 var RenameTableScripts = []ScriptTest{

enginetest/queries/queries.go

@@ -11791,6 +11791,6 @@ func MustParseTime(layout, value string) time.Time {
 
 func UnixTimeInLocal(sec, nsec int64) time.Time {
 	t := time.Unix(sec, nsec)
-	_, offset := t.Zone()
+	_, offset := time.Now().Zone()
 	return t.Add(time.Second * time.Duration(offset)).In(time.UTC)
 }

sql/types/number.go

@@ -969,7 +969,7 @@ func convertToInt64(t NumberTypeImpl_, v interface{}) (int64, sql.ConvertInRange
 		} else if v < float32(math.MinInt64) {
 			return math.MinInt64, sql.OutOfRange, nil
 		}
-		return int64(math.Round(float64(v))), sql.OutOfRange, nil
+		return int64(math.Round(float64(v))), sql.InRange, nil
 	case float64:
 		if v > float64(math.MaxInt64) {
 			return math.MaxInt64, sql.OutOfRange, nil