vitess.io/vitess@v0.16.2/go/vt/vtgate/planbuilder/gen4_planner_test.go (about)

     1  /*
     2  Copyright 2021 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package planbuilder
    18  
    19  import (
    20  	"testing"
    21  
    22  	"github.com/stretchr/testify/require"
    23  
    24  	"vitess.io/vitess/go/vt/sqlparser"
    25  	"vitess.io/vitess/go/vt/vtgate/semantics"
    26  	"vitess.io/vitess/go/vt/vtgate/vindexes"
    27  )
    28  
    29  func TestBindingSubquery(t *testing.T) {
    30  	testcases := []struct {
    31  		query            string
    32  		requiredTableSet semantics.TableSet
    33  		extractor        func(p *sqlparser.Select) sqlparser.Expr
    34  		rewrite          bool
    35  	}{
    36  		{
    37  			query:            "select (select col from tabl limit 1) as a from foo join tabl order by a + 1",
    38  			requiredTableSet: semantics.EmptyTableSet(),
    39  			extractor: func(sel *sqlparser.Select) sqlparser.Expr {
    40  				return sel.OrderBy[0].Expr
    41  			},
    42  			rewrite: true,
    43  		}, {
    44  			query:            "select t.a from (select (select col from tabl limit 1) as a from foo join tabl) t",
    45  			requiredTableSet: semantics.EmptyTableSet(),
    46  			extractor: func(sel *sqlparser.Select) sqlparser.Expr {
    47  				return extractExpr(sel, 0)
    48  			},
    49  			rewrite: true,
    50  		}, {
    51  			query:            "select (select col from tabl where foo.id = 4 limit 1) as a from foo",
    52  			requiredTableSet: semantics.SingleTableSet(0),
    53  			extractor: func(sel *sqlparser.Select) sqlparser.Expr {
    54  				return extractExpr(sel, 0)
    55  			},
    56  			rewrite: false,
    57  		},
    58  	}
    59  	for _, testcase := range testcases {
    60  		t.Run(testcase.query, func(t *testing.T) {
    61  			parse, err := sqlparser.Parse(testcase.query)
    62  			require.NoError(t, err)
    63  			selStmt := parse.(*sqlparser.Select)
    64  			semTable, err := semantics.Analyze(selStmt, "d", &semantics.FakeSI{
    65  				Tables: map[string]*vindexes.Table{
    66  					"tabl": {Name: sqlparser.NewIdentifierCS("tabl")},
    67  					"foo":  {Name: sqlparser.NewIdentifierCS("foo")},
    68  				},
    69  			})
    70  			require.NoError(t, err)
    71  			if testcase.rewrite {
    72  				err = queryRewrite(semTable, sqlparser.NewReservedVars("vt", make(sqlparser.BindVars)), selStmt)
    73  				require.NoError(t, err)
    74  			}
    75  			expr := testcase.extractor(selStmt)
    76  			tableset := semTable.RecursiveDeps(expr)
    77  			require.Equal(t, testcase.requiredTableSet, tableset)
    78  		})
    79  	}
    80  }
    81  
    82  func extractExpr(in *sqlparser.Select, idx int) sqlparser.Expr {
    83  	return in.SelectExprs[idx].(*sqlparser.AliasedExpr).Expr
    84  }