本文整理汇总了Golang中github.com/pingcap/tidb/util/types.ToFloat64函数的典型用法代码示例。如果您正苦于以下问题：Golang ToFloat64函数的具体用法？Golang ToFloat64怎么用？Golang ToFloat64使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了ToFloat64函数的8个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: builtinPow
func builtinPow(args []interface{}, ctx map[interface{}]interface{}) (v interface{}, err error) {
x, err := types.ToFloat64(args[0])
if err != nil {
return nil, errors.Trace(err)
}
y, err := types.ToFloat64(args[1])
if err != nil {
return nil, errors.Trace(err)
}
return math.Pow(x, y), nil
}示例2: builtinAbs
func builtinAbs(args []interface{}, ctx map[interface{}]interface{}) (v interface{}, err error) {
switch x := args[0].(type) {
case nil:
return nil, nil
case uint, uint8, uint16, uint32, uint64:
return x, nil
case int, int8, int16, int32, int64:
// we don't need to handle error here, it must be success
v, _ := types.ToInt64(args[0])
if v >= 0 {
return x, nil
}
// TODO: handle overflow if x is MinInt64
return -v, nil
case *types.DataItem:
args[0] = x.Data
return builtinAbs(args, ctx)
default:
// we will try to convert other types to float
// TODO: if time has no precision, it will be a integer
f, err := types.ToFloat64(args[0])
return math.Abs(f), errors.Trace(err)
}
}示例3: calculateSum
func calculateSum(sum interface{}, v interface{}) (interface{}, error) {
// for avg and sum calculation
// avg and sum use decimal for integer and decimal type, use float for others
// see https://dev.mysql.com/doc/refman/5.7/en/group-by-functions.html
var (
data interface{}
err error
)
switch y := v.(type) {
case int, uint, int8, uint8, int16, uint16, int32, uint32, int64, uint64:
data, err = mysql.ConvertToDecimal(v)
case mysql.Decimal:
data = y
default:
data, err = types.ToFloat64(v)
}
if err != nil {
return nil, err
}
switch x := sum.(type) {
case nil:
return data, nil
case float64:
return x + data.(float64), nil
case mysql.Decimal:
return x.Add(data.(mysql.Decimal)), nil
default:
return nil, errors.Errorf("invalid value %v(%T) for aggregate", x, x)
}
}示例4: evalDiv
func (o *BinaryOperation) evalDiv(a interface{}, b interface{}) (interface{}, error) {
// MySQL support integer divison Div and division operator /
// we use opcode.Div for division operator and will use another for integer division later.
// for division operator, we will use float64 for calculation.
switch x := a.(type) {
case float64:
y, err := types.ToFloat64(b)
if err != nil {
return nil, err
}
if y == 0 {
return nil, nil
}
return x / y, nil
default:
// the scale of the result is the scale of the first operand plus
// the value of the div_precision_increment system variable (which is 4 by default)
// we will use 4 here
xa, err := types.ToDecimal(a)
if err != nil {
return nil, o.traceErr(err)
}
xb, err := types.ToDecimal(b)
if err != nil {
return nil, o.traceErr(err)
}
if f, _ := xb.Float64(); f == 0 {
// division by zero return null
return nil, nil
}
return xa.Div(xb), nil
}
}示例5: TestBinopNumeric
func (s *testEvaluatorSuite) TestBinopNumeric(c *C) {
ctx := mock.NewContext()
tbl := []struct {
lhs interface{}
op opcode.Op
rhs interface{}
ret interface{}
}{
// plus
{1, opcode.Plus, 1, 2},
{1, opcode.Plus, uint64(1), 2},
{1, opcode.Plus, "1", 2},
{1, opcode.Plus, mysql.NewDecimalFromInt(1, 0), 2},
{uint64(1), opcode.Plus, 1, 2},
{uint64(1), opcode.Plus, uint64(1), 2},
{1, opcode.Plus, []byte("1"), 2},
{1, opcode.Plus, mysql.Hex{Value: 1}, 2},
{1, opcode.Plus, mysql.Bit{Value: 1, Width: 1}, 2},
{1, opcode.Plus, mysql.Enum{Name: "a", Value: 1}, 2},
{1, opcode.Plus, mysql.Set{Name: "a", Value: 1}, 2},
// minus
{1, opcode.Minus, 1, 0},
{1, opcode.Minus, uint64(1), 0},
{1, opcode.Minus, float64(1), 0},
{1, opcode.Minus, mysql.NewDecimalFromInt(1, 0), 0},
{uint64(1), opcode.Minus, 1, 0},
{uint64(1), opcode.Minus, uint64(1), 0},
{mysql.NewDecimalFromInt(1, 0), opcode.Minus, 1, 0},
{"1", opcode.Minus, []byte("1"), 0},
// mul
{1, opcode.Mul, 1, 1},
{1, opcode.Mul, uint64(1), 1},
{1, opcode.Mul, float64(1), 1},
{1, opcode.Mul, mysql.NewDecimalFromInt(1, 0), 1},
{uint64(1), opcode.Mul, 1, 1},
{uint64(1), opcode.Mul, uint64(1), 1},
{mysql.Time{}, opcode.Mul, 0, 0},
{mysql.ZeroDuration, opcode.Mul, 0, 0},
{mysql.Time{Time: time.Now(), Fsp: 0, Type: mysql.TypeDatetime}, opcode.Mul, 0, 0},
{mysql.Time{Time: time.Now(), Fsp: 6, Type: mysql.TypeDatetime}, opcode.Mul, 0, 0},
{mysql.Duration{Duration: 100000000, Fsp: 6}, opcode.Mul, 0, 0},
// div
{1, opcode.Div, float64(1), 1},
{1, opcode.Div, float64(0), nil},
{1, opcode.Div, 2, 0.5},
{1, opcode.Div, 0, nil},
// int div
{1, opcode.IntDiv, 2, 0},
{1, opcode.IntDiv, uint64(2), 0},
{1, opcode.IntDiv, 0, nil},
{1, opcode.IntDiv, uint64(0), nil},
{uint64(1), opcode.IntDiv, 2, 0},
{uint64(1), opcode.IntDiv, uint64(2), 0},
{uint64(1), opcode.IntDiv, 0, nil},
{uint64(1), opcode.IntDiv, uint64(0), nil},
{1.0, opcode.IntDiv, 2.0, 0},
{1.0, opcode.IntDiv, 0, nil},
// mod
{10, opcode.Mod, 2, 0},
{10, opcode.Mod, uint64(2), 0},
{10, opcode.Mod, 0, nil},
{10, opcode.Mod, uint64(0), nil},
{-10, opcode.Mod, uint64(2), 0},
{uint64(10), opcode.Mod, 2, 0},
{uint64(10), opcode.Mod, uint64(2), 0},
{uint64(10), opcode.Mod, 0, nil},
{uint64(10), opcode.Mod, uint64(0), nil},
{uint64(10), opcode.Mod, -2, 0},
{float64(10), opcode.Mod, 2, 0},
{float64(10), opcode.Mod, 0, nil},
{mysql.NewDecimalFromInt(10, 0), opcode.Mod, 2, 0},
{mysql.NewDecimalFromInt(10, 0), opcode.Mod, 0, nil},
}
for _, t := range tbl {
expr := &ast.BinaryOperationExpr{Op: t.op, L: ast.NewValueExpr(t.lhs), R: ast.NewValueExpr(t.rhs)}
v, err := Eval(ctx, expr)
c.Assert(err, IsNil)
switch v.(type) {
case nil:
c.Assert(t.ret, IsNil)
default:
// we use float64 as the result type check for all.
f, err := types.ToFloat64(v)
c.Assert(err, IsNil)
r, err := types.ToFloat64(t.ret)
c.Assert(err, IsNil)
c.Assert(r, Equals, f)
}
}
}示例6: TestNumericOp
func (s *testBinOpSuite) TestNumericOp(c *C) {
tbl := []struct {
lhs interface{}
op opcode.Op
rhs interface{}
ret interface{}
}{
// plus
{1, opcode.Plus, 1, 2},
{1, opcode.Plus, uint64(1), 2},
{1, opcode.Plus, "1", 2},
{1, opcode.Plus, mysql.NewDecimalFromInt(1, 0), 2},
{uint64(1), opcode.Plus, 1, 2},
{uint64(1), opcode.Plus, uint64(1), 2},
// minus
{1, opcode.Minus, 1, 0},
{1, opcode.Minus, uint64(1), 0},
{1, opcode.Minus, float64(1), 0},
{1, opcode.Minus, mysql.NewDecimalFromInt(1, 0), 0},
{uint64(1), opcode.Minus, 1, 0},
{uint64(1), opcode.Minus, uint64(1), 0},
{mysql.NewDecimalFromInt(1, 0), opcode.Minus, 1, 0},
// mul
{1, opcode.Mul, 1, 1},
{1, opcode.Mul, uint64(1), 1},
{1, opcode.Mul, float64(1), 1},
{1, opcode.Mul, mysql.NewDecimalFromInt(1, 0), 1},
{uint64(1), opcode.Mul, 1, 1},
{uint64(1), opcode.Mul, uint64(1), 1},
{mysql.Time{}, opcode.Mul, 0, 0},
{mysql.ZeroDuration, opcode.Mul, 0, 0},
// div
{1, opcode.Div, float64(1), 1},
{1, opcode.Div, float64(0), nil},
{1, opcode.Div, 2, 0.5},
{1, opcode.Div, 0, nil},
// int div
{1, opcode.IntDiv, 2, 0},
{1, opcode.IntDiv, uint64(2), 0},
{1, opcode.IntDiv, 0, nil},
{1, opcode.IntDiv, uint64(0), nil},
{uint64(1), opcode.IntDiv, 2, 0},
{uint64(1), opcode.IntDiv, uint64(2), 0},
{uint64(1), opcode.IntDiv, 0, nil},
{uint64(1), opcode.IntDiv, uint64(0), nil},
{1.0, opcode.IntDiv, 2.0, 0},
{1.0, opcode.IntDiv, 0, nil},
// mod
{10, opcode.Mod, 2, 0},
{10, opcode.Mod, uint64(2), 0},
{10, opcode.Mod, 0, nil},
{10, opcode.Mod, uint64(0), nil},
{-10, opcode.Mod, uint64(2), 0},
{uint64(10), opcode.Mod, 2, 0},
{uint64(10), opcode.Mod, uint64(2), 0},
{uint64(10), opcode.Mod, 0, nil},
{uint64(10), opcode.Mod, uint64(0), nil},
{uint64(10), opcode.Mod, -2, 0},
{float64(10), opcode.Mod, 2, 0},
{float64(10), opcode.Mod, 0, nil},
{mysql.NewDecimalFromInt(10, 0), opcode.Mod, 2, 0},
{mysql.NewDecimalFromInt(10, 0), opcode.Mod, 0, nil},
}
for _, t := range tbl {
expr := NewBinaryOperation(t.op, Value{t.lhs}, Value{t.rhs})
v, err := expr.Eval(nil, nil)
c.Assert(err, IsNil)
switch v.(type) {
case nil:
c.Assert(t.ret, IsNil)
default:
// we use float64 as the result type check for all.
f, err := types.ToFloat64(v)
c.Assert(err, IsNil)
r, err := types.ToFloat64(t.ret)
c.Assert(err, IsNil)
c.Assert(r, Equals, f)
}
}
// test error
expr := &BinaryOperation{}
_, err := expr.evalPlus(1, 1)
c.Assert(err, NotNil)
_, err = expr.evalMinus(1, 1)
c.Assert(err, NotNil)
_, err = expr.evalMul(1, 1)
c.Assert(err, NotNil)
_, err = expr.evalDiv("abc", 1)
c.Assert(err, NotNil)
//.........这里部分代码省略.........
示例7: TestGroupBy
func (s *testBuiltinSuite) TestGroupBy(c *C) {
tbl := []struct {
F string
// args for every Eval round
RoundArgs []interface{}
Distinct bool
Ret interface{}
}{
{"avg", []interface{}{1, 1}, false, 1},
{"avg", []interface{}{1, 2}, true, 1.5},
{"avg", []interface{}{1.0, 2.0}, true, 1.5},
{"avg", []interface{}{1, 1}, true, 1},
{"avg", []interface{}{nil, nil}, true, nil},
{"count", []interface{}{1, 1}, false, 2},
{"count", []interface{}{1, 1}, true, 1},
{"count", []interface{}{nil, nil}, true, 0},
{"count", []interface{}{nil, nil}, false, 0},
{"count", []interface{}{nil, 1}, true, 1},
{"max", []interface{}{1, 2, 3}, false, 3},
{"max", []interface{}{nil, 2}, false, 2},
{"max", []interface{}{nil, nil}, false, nil},
{"min", []interface{}{1, 2, 3}, false, 1},
{"min", []interface{}{nil, 1}, false, 1},
{"min", []interface{}{nil, nil}, false, nil},
{"min", []interface{}{3, 2, 1}, false, 1},
{"sum", []interface{}{1, 1, 1, 1, 1}, false, 5},
{"sum", []interface{}{float64(1.0), float64(1.0)}, false, 2.0},
{"sum", []interface{}{1, 1, 1, 1, 1}, true, 1},
{"sum", []interface{}{1, mysql.NewDecimalFromInt(1, 0)}, false, 2},
{"sum", []interface{}{nil, nil}, false, nil},
{"sum", []interface{}{nil, nil}, true, nil},
}
for _, t := range tbl {
f, ok := Funcs[t.F]
c.Assert(ok, IsTrue)
m := map[interface{}]interface{}{}
m[ExprEvalFn] = new(Func)
m[ExprAggDistinct] = CreateAggregateDistinct(t.F, t.Distinct)
for _, arg := range t.RoundArgs {
args := []interface{}{arg}
_, err := f.F(args, m)
c.Assert(err, IsNil)
}
m[ExprAggDone] = struct{}{}
v, err := f.F(nil, m)
c.Assert(err, IsNil)
switch v.(type) {
case nil:
c.Assert(t.Ret, IsNil)
default:
// we can not check decimal type directly, but we can convert all to float64
f, err := types.ToFloat64(v)
c.Assert(err, IsNil)
ret, err := types.ToFloat64(t.Ret)
c.Assert(err, IsNil)
c.Assert(f, Equals, ret)
}
}
}示例8: TestGroupBy
func (s *testBuiltinSuite) TestGroupBy(c *C) {
tbl := []struct {
F string
// args for every Eval round
RoundArgs []interface{}
Distinct bool
Ret interface{}
}{
{"avg", []interface{}{1, 1}, false, 1},
{"avg", []interface{}{1, 2}, true, 1.5},
{"avg", []interface{}{1.0, 2.0}, true, 1.5},
{"avg", []interface{}{1, 1}, true, 1},
{"avg", []interface{}{nil, nil}, true, nil},
{"count", []interface{}{1, 1}, false, 2},
{"count", []interface{}{1, 1}, true, 1},
{"count", []interface{}{nil, nil}, true, 0},
{"count", []interface{}{nil, nil}, false, 0},
{"count", []interface{}{nil, 1}, true, 1},
{"max", []interface{}{1, 2, 3}, false, 3},
{"max", []interface{}{nil, 2}, false, 2},
{"max", []interface{}{nil, nil}, false, nil},
{"min", []interface{}{1, 2, 3}, false, 1},
{"min", []interface{}{nil, 1}, false, 1},
{"min", []interface{}{nil, nil}, false, nil},
{"min", []interface{}{3, 2, 1}, false, 1},
{"sum", []interface{}{1, 1, 1, 1, 1}, false, 5},
{"sum", []interface{}{float64(1.0), float64(1.0)}, false, 2.0},
{"sum", []interface{}{1, 1, 1, 1, 1}, true, 1},
{"sum", []interface{}{1, mysql.NewDecimalFromInt(1, 0)}, false, 2},
{"sum", []interface{}{nil, nil}, false, nil},
{"sum", []interface{}{nil, nil}, true, nil},
}
for _, t := range tbl {
// create a call and use dummy args.
e, err := NewCall(t.F, []expression.Expression{Value{nil}}, t.Distinct)
c.Assert(err, IsNil)
call, ok := e.(*Call)
c.Assert(ok, IsTrue)
m := map[interface{}]interface{}{}
for _, arg := range t.RoundArgs {
call.Args = []expression.Expression{Value{arg}}
_, err = call.Eval(nil, m)
}
m[ExprAggDone] = struct{}{}
v, err := e.Eval(nil, m)
c.Assert(err, IsNil)
switch v.(type) {
case nil:
c.Assert(t.Ret, IsNil)
default:
// we can not check decimal type directly, but we can convert all to float64
f, err := types.ToFloat64(v)
c.Assert(err, IsNil)
ret, err := types.ToFloat64(t.Ret)
c.Assert(err, IsNil)
c.Assert(f, Equals, ret)
}
}
}