357 lines
19 KiB
Go
357 lines
19 KiB
Go
// Copyright 2021 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package executor_test
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import (
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"fmt"
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"testing"
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"github.com/pingcap/tidb/testkit"
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"github.com/stretchr/testify/require"
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)
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func TestBasicCTE(t *testing.T) {
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t.Parallel()
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store, close := testkit.CreateMockStore(t)
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defer close()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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rows := tk.MustQuery("with recursive cte1 as (" +
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"select 1 c1 " +
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"union all " +
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"select c1 + 1 c1 from cte1 where c1 < 5) " +
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"select * from cte1")
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rows.Check(testkit.Rows("1", "2", "3", "4", "5"))
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// Two seed parts.
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rows = tk.MustQuery("with recursive cte1 as (" +
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"select 1 c1 " +
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"union all " +
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"select 2 c1 " +
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"union all " +
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"select c1 + 1 c1 from cte1 where c1 < 10) " +
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"select * from cte1 order by c1")
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rows.Check(testkit.Rows("1", "2", "2", "3", "3", "4", "4", "5", "5", "6", "6", "7", "7", "8", "8", "9", "9", "10", "10"))
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// Two recursive parts.
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rows = tk.MustQuery("with recursive cte1 as (" +
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"select 1 c1 " +
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"union all " +
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"select 2 c1 " +
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"union all " +
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"select c1 + 1 c1 from cte1 where c1 < 3 " +
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"union all " +
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"select c1 + 2 c1 from cte1 where c1 < 5) " +
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"select * from cte1 order by c1")
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rows.Check(testkit.Rows("1", "2", "2", "3", "3", "3", "4", "4", "5", "5", "5", "6", "6"))
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tk.MustExec("drop table if exists t1;")
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tk.MustExec("create table t1(a int);")
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tk.MustExec("insert into t1 values(1);")
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tk.MustExec("insert into t1 values(2);")
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rows = tk.MustQuery("SELECT * FROM t1 dt WHERE EXISTS(WITH RECURSIVE qn AS (SELECT a*0 AS b UNION ALL SELECT b+1 FROM qn WHERE b=0) SELECT * FROM qn WHERE b=a);")
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rows.Check(testkit.Rows("1"))
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rows = tk.MustQuery("SELECT * FROM t1 dt WHERE EXISTS( WITH RECURSIVE qn AS (SELECT a*0 AS b UNION ALL SELECT b+1 FROM qn WHERE b=0 or b = 1) SELECT * FROM qn WHERE b=a );")
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rows.Check(testkit.Rows("1", "2"))
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rows = tk.MustQuery("with recursive c(p) as (select 1), cte(a, b) as (select 1, 1 union select a+1, 1 from cte, c where a < 5) select * from cte order by 1, 2;")
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rows.Check(testkit.Rows("1 1", "2 1", "3 1", "4 1", "5 1"))
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}
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func TestUnionDistinct(t *testing.T) {
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t.Parallel()
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store, close := testkit.CreateMockStore(t)
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defer close()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test;")
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// Basic test. UNION/UNION ALL intersects.
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rows := tk.MustQuery("with recursive cte1(c1) as (select 1 union select 1 union select 1 union all select c1 + 1 from cte1 where c1 < 3) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2", "3"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union all select 1 union select 1 union all select c1 + 1 from cte1 where c1 < 3) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2", "3"))
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tk.MustExec("drop table if exists t1;")
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tk.MustExec("create table t1(c1 int, c2 int);")
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tk.MustExec("insert into t1 values(1, 1), (1, 2), (2, 2);")
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 c1 from t1) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2", "3"))
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tk.MustExec("drop table if exists t1;")
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tk.MustExec("create table t1(c1 int);")
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tk.MustExec("insert into t1 values(1), (1), (1), (2), (2), (2);")
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 c1 from cte1 where c1 < 4) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2", "3", "4"))
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}
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func TestCTEMaxRecursionDepth(t *testing.T) {
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t.Parallel()
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store, close := testkit.CreateMockStore(t)
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defer close()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test;")
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tk.MustExec("set @@cte_max_recursion_depth = -1;")
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err := tk.QueryToErr("with recursive cte1(c1) as (select 1 union select c1 + 1 c1 from cte1 where c1 < 100) select * from cte1;")
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require.EqualError(t, err, "[executor:3636]Recursive query aborted after 1 iterations. Try increasing @@cte_max_recursion_depth to a larger value")
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// If there is no recursive part, query runs ok.
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rows := tk.MustQuery("with recursive cte1(c1) as (select 1 union select 2) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2"))
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rows = tk.MustQuery("with cte1(c1) as (select 1 union select 2) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2"))
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tk.MustExec("set @@cte_max_recursion_depth = 0;")
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err = tk.QueryToErr("with recursive cte1(c1) as (select 1 union select c1 + 1 c1 from cte1 where c1 < 0) select * from cte1;")
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require.EqualError(t, err, "[executor:3636]Recursive query aborted after 1 iterations. Try increasing @@cte_max_recursion_depth to a larger value")
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err = tk.QueryToErr("with recursive cte1(c1) as (select 1 union select c1 + 1 c1 from cte1 where c1 < 1) select * from cte1;")
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require.EqualError(t, err, "[executor:3636]Recursive query aborted after 1 iterations. Try increasing @@cte_max_recursion_depth to a larger value")
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// If there is no recursive part, query runs ok.
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select 2) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2"))
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rows = tk.MustQuery("with cte1(c1) as (select 1 union select 2) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2"))
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tk.MustExec("set @@cte_max_recursion_depth = 1;")
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 c1 from cte1 where c1 < 0) select * from cte1;")
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rows.Check(testkit.Rows("1"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 c1 from cte1 where c1 < 1) select * from cte1;")
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rows.Check(testkit.Rows("1"))
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err = tk.QueryToErr("with recursive cte1(c1) as (select 1 union select c1 + 1 c1 from cte1 where c1 < 2) select * from cte1;")
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require.EqualError(t, err, "[executor:3636]Recursive query aborted after 2 iterations. Try increasing @@cte_max_recursion_depth to a larger value")
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// If there is no recursive part, query runs ok.
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select 2) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2"))
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rows = tk.MustQuery("with cte1(c1) as (select 1 union select 2) select * from cte1 order by c1;")
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rows.Check(testkit.Rows("1", "2"))
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}
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func TestCTEWithLimit(t *testing.T) {
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t.Parallel()
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store, close := testkit.CreateMockStore(t)
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defer close()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test;")
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// Basic recursive tests.
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rows := tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 5 offset 0) select * from cte1")
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rows.Check(testkit.Rows("1", "2", "3", "4", "5"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 5 offset 1) select * from cte1")
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rows.Check(testkit.Rows("2", "3", "4", "5", "6"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 5 offset 10) select * from cte1")
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rows.Check(testkit.Rows("11", "12", "13", "14", "15"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 5 offset 995) select * from cte1")
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rows.Check(testkit.Rows("996", "997", "998", "999", "1000"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 5 offset 6) select * from cte1;")
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rows.Check(testkit.Rows("7", "8", "9", "10", "11"))
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// Test with cte_max_recursion_depth
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tk.MustExec("set cte_max_recursion_depth=2;")
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rows = tk.MustQuery("with recursive cte1(c1) as (select 0 union select c1 + 1 from cte1 limit 1 offset 2) select * from cte1;")
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rows.Check(testkit.Rows("2"))
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err := tk.QueryToErr("with recursive cte1(c1) as (select 0 union select c1 + 1 from cte1 limit 1 offset 3) select * from cte1;")
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require.EqualError(t, err, "[executor:3636]Recursive query aborted after 3 iterations. Try increasing @@cte_max_recursion_depth to a larger value")
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tk.MustExec("set cte_max_recursion_depth=1000;")
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rows = tk.MustQuery("with recursive cte1(c1) as (select 0 union select c1 + 1 from cte1 limit 5 offset 996) select * from cte1;")
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rows.Check(testkit.Rows("996", "997", "998", "999", "1000"))
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err = tk.QueryToErr("with recursive cte1(c1) as (select 0 union select c1 + 1 from cte1 limit 5 offset 997) select * from cte1;")
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require.EqualError(t, err, "[executor:3636]Recursive query aborted after 1001 iterations. Try increasing @@cte_max_recursion_depth to a larger value")
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 0 offset 1) select * from cte1")
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rows.Check(testkit.Rows())
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 0 offset 10) select * from cte1")
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rows.Check(testkit.Rows())
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// Test join.
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 2 offset 1) select * from cte1 dt1 join cte1 dt2 order by dt1.c1, dt2.c1;")
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rows.Check(testkit.Rows("2 2", "2 3", "3 2", "3 3"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 2 offset 1) select * from cte1 dt1 join cte1 dt2 on dt1.c1 = dt2.c1 order by dt1.c1, dt1.c1;")
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rows.Check(testkit.Rows("2 2", "3 3"))
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// Test subquery.
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// Different with mysql, maybe it's mysql bug?(https://bugs.mysql.com/bug.php?id=103890&thanks=4)
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 2 offset 1) select c1 from cte1 where c1 in (select 2);")
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rows.Check(testkit.Rows("2"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 2 offset 1) select c1 from cte1 dt where c1 in (select c1 from cte1 where 1 = dt.c1 - 1);")
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rows.Check(testkit.Rows("2"))
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// Test Apply.
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select c1 + 1 from cte1 limit 2 offset 1) select c1 from cte1 where cte1.c1 = (select dt1.c1 from cte1 dt1 where dt1.c1 = cte1.c1);")
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rows.Check(testkit.Rows("2", "3"))
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// Recursive tests with table.
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tk.MustExec("drop table if exists t1;")
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tk.MustExec("create table t1(c1 int);")
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tk.MustExec("insert into t1 values(1), (2), (3);")
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// Error: ERROR 1221 (HY000): Incorrect usage of UNION and LIMIT.
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// Limit can only be at the end of SQL stmt.
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err = tk.ExecToErr("with recursive cte1(c1) as (select c1 from t1 limit 1 offset 1 union select c1 + 1 from cte1 limit 0 offset 1) select * from cte1")
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require.EqualError(t, err, "[planner:1221]Incorrect usage of UNION and LIMIT")
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// Basic non-recusive tests.
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select 2 order by 1 limit 1 offset 1) select * from cte1")
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rows.Check(testkit.Rows("2"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select 2 order by 1 limit 0 offset 1) select * from cte1")
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rows.Check(testkit.Rows())
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rows = tk.MustQuery("with recursive cte1(c1) as (select 1 union select 2 order by 1 limit 2 offset 0) select * from cte1")
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rows.Check(testkit.Rows("1", "2"))
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// Test with table.
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tk.MustExec("drop table if exists t1;")
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insertStr := "insert into t1 values(0)"
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for i := 1; i < 300; i++ {
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insertStr += fmt.Sprintf(", (%d)", i)
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}
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tk.MustExec("drop table if exists t1;")
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tk.MustExec("create table t1(c1 int);")
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tk.MustExec(insertStr)
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 c1 from cte1 limit 1) select * from cte1")
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rows.Check(testkit.Rows("0"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 c1 from cte1 limit 1 offset 100) select * from cte1")
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rows.Check(testkit.Rows("100"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 c1 from cte1 limit 5 offset 100) select * from cte1")
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rows.Check(testkit.Rows("100", "101", "102", "103", "104"))
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// Basic non-recursive tests.
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rows = tk.MustQuery("with cte1 as (select c1 from t1 limit 2 offset 1) select * from cte1")
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rows.Check(testkit.Rows("1", "2"))
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rows = tk.MustQuery("with cte1 as (select c1 from t1 limit 2 offset 1) select * from cte1 dt1 join cte1 dt2 on dt1.c1 = dt2.c1")
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rows.Check(testkit.Rows("1 1", "2 2"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select 2 limit 0 offset 1) select * from cte1")
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rows.Check(testkit.Rows())
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select 2 limit 0 offset 1) select * from cte1 dt1 join cte1 dt2 on dt1.c1 = dt2.c1")
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rows.Check(testkit.Rows())
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// rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select 2 limit 5 offset 100) select * from cte1")
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// rows.Check(testkit.Rows("100", "101", "102", "103", "104"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 limit 3 offset 100) select * from cte1")
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rows.Check(testkit.Rows("100", "101", "102"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 limit 3 offset 100) select * from cte1 dt1 join cte1 dt2 on dt1.c1 = dt2.c1")
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rows.Check(testkit.Rows("100 100", "101 101", "102 102"))
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// Test limit 0.
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tk.MustExec("set cte_max_recursion_depth = 0;")
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tk.MustExec("drop table if exists t1;")
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tk.MustExec("create table t1(c1 int);")
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tk.MustExec("insert into t1 values(0);")
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rows = tk.MustQuery("with recursive cte1 as (select 1/c1 c1 from t1 union select c1 + 1 c1 from cte1 where c1 < 2 limit 0) select * from cte1;")
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rows.Check(testkit.Rows())
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// MySQL err: ERROR 1365 (22012): Division by 0. Because it gives error when computing 1/c1.
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err = tk.QueryToErr("with recursive cte1 as (select 1/c1 c1 from t1 union select c1 + 1 c1 from cte1 where c1 < 2 limit 1) select * from cte1;")
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require.EqualError(t, err, "[executor:3636]Recursive query aborted after 1 iterations. Try increasing @@cte_max_recursion_depth to a larger value")
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tk.MustExec("set cte_max_recursion_depth = 1000;")
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tk.MustExec("drop table if exists t1;")
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tk.MustExec("create table t1(c1 int);")
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tk.MustExec("insert into t1 values(1), (2), (3);")
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 0 offset 2) select * from cte1;")
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rows.Check(testkit.Rows())
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 1 offset 2) select * from cte1;")
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rows.Check(testkit.Rows("3"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 2 offset 2) select * from cte1;")
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rows.Check(testkit.Rows("3", "4"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 3 offset 2) select * from cte1;")
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rows.Check(testkit.Rows("3", "4", "5"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 4 offset 2) select * from cte1;")
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rows.Check(testkit.Rows("3", "4", "5", "6"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 0 offset 3) select * from cte1;")
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rows.Check(testkit.Rows())
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 1 offset 3) select * from cte1;")
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rows.Check(testkit.Rows("4"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 2 offset 3) select * from cte1;")
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rows.Check(testkit.Rows("4", "5"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 3 offset 3) select * from cte1;")
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rows.Check(testkit.Rows("4", "5", "6"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 4 offset 3) select * from cte1;")
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rows.Check(testkit.Rows("4", "5", "6", "7"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 0 offset 4) select * from cte1;")
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rows.Check(testkit.Rows())
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 1 offset 4) select * from cte1;")
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rows.Check(testkit.Rows("5"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 2 offset 4) select * from cte1;")
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rows.Check(testkit.Rows("5", "6"))
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rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 3 offset 4) select * from cte1;")
|
|
rows.Check(testkit.Rows("5", "6", "7"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union select c1 + 1 from cte1 limit 4 offset 4) select * from cte1;")
|
|
rows.Check(testkit.Rows("5", "6", "7", "8"))
|
|
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 0 offset 2) select * from cte1;")
|
|
rows.Check(testkit.Rows())
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 1 offset 2) select * from cte1;")
|
|
rows.Check(testkit.Rows("3"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 2 offset 2) select * from cte1;")
|
|
rows.Check(testkit.Rows("3", "2"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 3 offset 2) select * from cte1;")
|
|
rows.Check(testkit.Rows("3", "2", "3"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 4 offset 2) select * from cte1;")
|
|
rows.Check(testkit.Rows("3", "2", "3", "4"))
|
|
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 0 offset 3) select * from cte1;")
|
|
rows.Check(testkit.Rows())
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 1 offset 3) select * from cte1;")
|
|
rows.Check(testkit.Rows("2"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 2 offset 3) select * from cte1;")
|
|
rows.Check(testkit.Rows("2", "3"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 3 offset 3) select * from cte1;")
|
|
rows.Check(testkit.Rows("2", "3", "4"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 4 offset 3) select * from cte1;")
|
|
rows.Check(testkit.Rows("2", "3", "4", "3"))
|
|
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 0 offset 4) select * from cte1;")
|
|
rows.Check(testkit.Rows())
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 1 offset 4) select * from cte1;")
|
|
rows.Check(testkit.Rows("3"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 2 offset 4) select * from cte1;")
|
|
rows.Check(testkit.Rows("3", "4"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 3 offset 4) select * from cte1;")
|
|
rows.Check(testkit.Rows("3", "4", "3"))
|
|
rows = tk.MustQuery("with recursive cte1(c1) as (select c1 from t1 union all select c1 + 1 from cte1 limit 4 offset 4) select * from cte1;")
|
|
rows.Check(testkit.Rows("3", "4", "3", "4"))
|
|
}
|