vitess.io/vitess@v0.16.2/go/vt/vtgate/evalengine/mysql_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 evalengine
    18  
    19  import (
    20  	"encoding/json"
    21  	"errors"
    22  	"fmt"
    23  	"os"
    24  	"path/filepath"
    25  	"strings"
    26  	"testing"
    27  
    28  	"vitess.io/vitess/go/mysql/collations"
    29  	"vitess.io/vitess/go/vt/sqlparser"
    30  )
    31  
    32  func knownBadQuery(expr Expr) bool {
    33  	isNullSafeComparison := func(expr Expr) bool {
    34  		if cmp, ok := expr.(*ComparisonExpr); ok {
    35  			return cmp.Op.String() == "<=>"
    36  		}
    37  		return false
    38  	}
    39  
    40  	if isNullSafeComparison(expr) {
    41  		cmp := expr.(*ComparisonExpr)
    42  		return isNullSafeComparison(cmp.Left) || isNullSafeComparison(cmp.Right)
    43  	}
    44  	return false
    45  }
    46  
    47  var errKnownBadQuery = errors.New("this query is known to give bad results in MySQL")
    48  
    49  func convert(t *testing.T, query string, simplify bool) (Expr, error) {
    50  	stmt, err := sqlparser.Parse(query)
    51  	if err != nil {
    52  		t.Fatal(err)
    53  	}
    54  
    55  	astExpr := stmt.(*sqlparser.Select).SelectExprs[0].(*sqlparser.AliasedExpr).Expr
    56  	converted, err := TranslateEx(astExpr, LookupDefaultCollation(collations.CollationUtf8mb4ID), simplify)
    57  	if err == nil {
    58  		if knownBadQuery(converted) {
    59  			return nil, errKnownBadQuery
    60  		}
    61  		return converted, nil
    62  	}
    63  	return nil, err
    64  }
    65  
    66  func testSingle(t *testing.T, query string) (EvalResult, error) {
    67  	converted, err := convert(t, query, true)
    68  	if err == nil {
    69  		return EnvWithBindVars(nil, collations.CollationUtf8mb4ID).Evaluate(converted)
    70  	}
    71  	return EvalResult{}, err
    72  }
    73  
    74  func TestMySQLGolden(t *testing.T) {
    75  	golden, _ := filepath.Glob("integration/testdata/*.json")
    76  	for _, gld := range golden {
    77  		t.Run(filepath.Base(gld), func(t *testing.T) {
    78  			var testcases []struct {
    79  				Query string
    80  				Value string
    81  				Error string
    82  			}
    83  
    84  			infile, err := os.Open(gld)
    85  			if err != nil {
    86  				t.Fatal(err)
    87  			}
    88  
    89  			if err := json.NewDecoder(infile).Decode(&testcases); err != nil {
    90  				t.Fatal(err)
    91  			}
    92  
    93  			var ok int
    94  
    95  			for _, tc := range testcases {
    96  				debug := fmt.Sprintf("\n// Debug\neval, err := testSingle(t, `%s`)\nt.Logf(\"eval=%%s err=%%v\", eval.Value(), err) // want value=%q\n", tc.Query, tc.Value)
    97  				eval, err := testSingle(t, tc.Query)
    98  				if err == errKnownBadQuery {
    99  					ok++
   100  					continue
   101  				}
   102  				if err != nil {
   103  					if tc.Error == "" {
   104  						t.Errorf("query: %s\nmysql val: %s\nvitess err: %s\n%s", tc.Query, tc.Value, err.Error(), debug)
   105  					} else if !strings.HasPrefix(tc.Error, err.Error()) {
   106  						t.Errorf("query: %s\nmysql err: %s\nvitess err: %s\n%s", tc.Query, tc.Error, err.Error(), debug)
   107  					} else {
   108  						ok++
   109  					}
   110  					continue
   111  				}
   112  				if tc.Error != "" {
   113  					t.Errorf("query: %s\nmysql err: %s\nvitess val: %s\n%s", tc.Query, tc.Error, eval.Value(), debug)
   114  					continue
   115  				}
   116  				if eval.Value().String() != tc.Value {
   117  					t.Errorf("query: %s\nmysql val: %s\nvitess val: %s\n%s", tc.Query, tc.Value, eval.Value(), debug)
   118  					continue
   119  				}
   120  				ok++
   121  			}
   122  
   123  			t.Logf("passed %d/%d tests (%.02f%%)", ok, len(testcases), 100*float64(ok)/float64(len(testcases)))
   124  		})
   125  	}
   126  }
   127  
   128  func TestDebug1(t *testing.T) {
   129  	// Debu	g
   130  	eval, err := testSingle(t, `SELECT LCASE(-999999999999999999999999)`)
   131  	t.Logf("eval=%s err=%v coll=%s", eval.String(), err, collations.Local().LookupByID(eval.Collation()).Name())
   132  }