// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

package executor_test

import (
	. "github.com/pingcap/check"
	"github.com/pingcap/tidb/util/testkit"
)

func (s *partitionTableSuite) TestThreeReader(c *C) {
	tk := testkit.NewTestKitWithInit(c, s.store)
	tk.MustExec("drop table if exists pt")
	tk.MustExec(`create table pt (id int, c int, key i_id(id), key i_c(c)) partition by range (c) (
partition p0 values less than (4),
partition p1 values less than (7),
partition p2 values less than (10))`)
	tk.MustExec("insert into pt values (0, 0), (2, 2), (4, 4), (6, 6), (7, 7), (9, 9), (null, null)")

	tk.MustExec("set @try_new_partition_implementation = 1;")

	// Table reader
	tk.MustQuery("select * from pt").Sort().Check(testkit.Rows("0 0", "2 2", "4 4", "6 6", "7 7", "9 9", "<nil> <nil>"))
	// Table reader: table dual
	tk.MustQuery("select * from pt where c > 10").Check(testkit.Rows())
	// Table reader: one partition
	tk.MustQuery("select * from pt where c > 8").Check(testkit.Rows("9 9"))
	// Table reader: more than one partition
	tk.MustQuery("select * from pt where c < 2 or c >= 9").Check(testkit.Rows("0 0", "9 9"))

	// Index reader
	tk.MustQuery("select c from pt").Sort().Check(testkit.Rows("0", "2", "4", "6", "7", "9", "<nil>"))
	tk.MustQuery("select c from pt where c > 10").Check(testkit.Rows())
	tk.MustQuery("select c from pt where c > 8").Check(testkit.Rows("9"))
	tk.MustQuery("select c from pt where c < 2 or c >= 9").Check(testkit.Rows("0", "9"))

	// Index lookup
	tk.MustQuery("select /*+ use_index(pt, i_id) */ * from pt").Sort().Check(testkit.Rows("0 0", "2 2", "4 4", "6 6", "7 7", "9 9", "<nil> <nil>"))
	tk.MustQuery("select /*+ use_index(pt, i_id) */ * from pt where id < 4 and c > 10").Check(testkit.Rows())
	tk.MustQuery("select /*+ use_index(pt, i_id) */ * from pt where id < 10 and c > 8").Check(testkit.Rows("9 9"))
	tk.MustQuery("select /*+ use_index(pt, i_id) */ * from pt where id < 10 and c < 2 or c >= 9").Check(testkit.Rows("0 0", "9 9"))
}