func (s *testVisitorSuite) TestBase(c *C) {
val := expression.Value{Val: 1}
visitor := expression.NewIdentEvalVisitor()
var exp expression.Expression
exp = &expression.Between{Expr: val, Left: val, Right: val}
exp.Accept(visitor)
exp = expression.NewBinaryOperation(opcode.And, val, val)
exp.Accept(visitor)
exp, _ = expression.NewCall("avg", []expression.Expression{val}, true)
exp.Accept(visitor)
rows := [][]interface{}{{1}}
sq := newMockSubQuery(rows, []string{"a"})
exp = expression.NewCompareSubQuery(opcode.EQ, val, sq, true)
exp.Accept(visitor)
exp = &expression.Default{Name: "a"}
exp.Accept(visitor)
exp = expression.NewExistsSubQuery(sq)
exp.Accept(visitor)
when := &expression.WhenClause{Expr: val, Result: val}
exp = &expression.FunctionCase{
WhenClauses: []*expression.WhenClause{when},
Value: val,
ElseClause: val,
}
exp.Accept(visitor)
exp = &expression.FunctionCast{Expr: val, Tp: types.NewFieldType(mysql.TypeLong), FunctionType: expression.ConvertFunction}
exp.Accept(visitor)
exp = &expression.FunctionConvert{Expr: val, Charset: "utf8"}
exp.Accept(visitor)
exp = &expression.FunctionSubstring{StrExpr: expression.Value{Val: "string"}, Pos: expression.Value{Val: 0}, Len: val}
exp.Accept(visitor)
exp = &expression.IsNull{Expr: val}
exp.Accept(visitor)
exp = &expression.IsTruth{Expr: val}
exp.Accept(visitor)
exp = &expression.ParamMarker{Expr: val}
exp.Accept(visitor)
exp = &expression.PatternIn{Expr: val, List: []expression.Expression{val}}
exp.Accept(visitor)
exp = &expression.PatternLike{Expr: val, Pattern: val}
exp.Accept(visitor)
exp = &expression.PatternRegexp{Expr: val, Pattern: val}
exp.Accept(visitor)
exp = &expression.PExpr{Expr: val}
exp.Accept(visitor)
exp = &expression.Position{Name: "a"}
exp.Accept(visitor)
exp = &expression.Row{Values: []expression.Expression{val}}
exp.Accept(visitor)
exp = &expression.UnaryOperation{V: val}
exp.Accept(visitor)
exp = &expression.Values{CIStr: model.NewCIStr("a")}
exp.Accept(visitor)
exp = &expression.Variable{Name: "a"}
exp.Accept(visitor)
}
func (s *testExistsSubQuerySuite) TestExistsSubQuery(c *C) {
// Test exists subquery.
tbl := []struct {
in []interface{}
result int64 // 0 for false, 1 for true.
}{
{[]interface{}{1}, 1},
{[]interface{}{nil}, 1},
{[]interface{}{}, 0},
}
ctx := mock.NewContext()
for _, t := range tbl {
in := make([][]interface{}, 0, len(t.in))
for _, v := range t.in {
in = append(in, []interface{}{convert(v)})
}
sq := newMockSubQuery(in, []string{"c"})
expr := expression.NewExistsSubQuery(sq)
c.Assert(expr.IsStatic(), IsFalse)
exprc := expr.Clone()
c.Assert(exprc, NotNil)
str := exprc.String()
c.Assert(len(str), Greater, 0)
v, err := exprc.Eval(ctx, nil)
c.Assert(err, IsNil)
val, err := types.ToBool(v)
c.Assert(err, IsNil)
c.Assert(val, Equals, t.result)
// test cache
v, err = exprc.Eval(ctx, nil)
c.Assert(err, IsNil)
val, err = types.ToBool(v)
c.Assert(err, IsNil)
c.Assert(val, Equals, t.result)
}
// Test not exists subquery.
tbl = []struct {
in []interface{}
result int64 // 0 for false, 1 for true.
}{
{[]interface{}{1}, 0},
{[]interface{}{nil}, 0},
{[]interface{}{}, 1},
}
for _, t := range tbl {
in := make([][]interface{}, 0, len(t.in))
for _, v := range t.in {
in = append(in, []interface{}{convert(v)})
}
sq := newMockSubQuery(in, []string{"c"})
es := expression.NewExistsSubQuery(sq)
c.Assert(es.IsStatic(), IsFalse)
str := es.String()
c.Assert(len(str), Greater, 0)
expr := expression.NewUnaryOperation(opcode.Not, es)
exprc := expr.Clone()
c.Assert(exprc, NotNil)
str = exprc.String()
c.Assert(len(str), Greater, 0)
v, err := exprc.Eval(ctx, nil)
c.Assert(err, IsNil)
val, err := types.ToBool(v)
c.Assert(err, IsNil)
c.Assert(val, Equals, t.result)
}
}