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expression: fix type infer of unaryMinus which should return ETDecimal if ETInt overflow int (#11989) #11990

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merged 2 commits into from
Sep 2, 2019
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expression: fix type infer of unaryMinus which should return ETDecimal if ETInt overflow int (#11989) #11990

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561c021
expression: fix type infer of unaryMinus which should return ETDecima…
lonng Sep 2, 2019
e9c44f9
add integration tests
lonng Sep 2, 2019
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7 changes: 3 additions & 4 deletions expression/builtin_op.go
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Original file line number Diff line number Diff line change
Expand Up @@ -643,16 +643,15 @@ func (c *unaryMinusFunctionClass) handleIntOverflow(arg *Constant) (overflow boo

// typeInfer infers unaryMinus function return type. when the arg is an int constant and overflow,
// typerInfer will infers the return type as types.ETDecimal, not types.ETInt.
func (c *unaryMinusFunctionClass) typeInfer(ctx sessionctx.Context, argExpr Expression) (types.EvalType, bool) {
func (c *unaryMinusFunctionClass) typeInfer(argExpr Expression) (types.EvalType, bool) {
tp := argExpr.GetType().EvalType()
if tp != types.ETInt && tp != types.ETDecimal {
tp = types.ETReal
}

sc := ctx.GetSessionVars().StmtCtx
overflow := false
// TODO: Handle float overflow.
if arg, ok := argExpr.(*Constant); sc.InSelectStmt && ok && tp == types.ETInt {
if arg, ok := argExpr.(*Constant); ok && tp == types.ETInt {
overflow = c.handleIntOverflow(arg)
if overflow {
tp = types.ETDecimal
Expand All @@ -667,7 +666,7 @@ func (c *unaryMinusFunctionClass) getFunction(ctx sessionctx.Context, args []Exp
}

argExpr, argExprTp := args[0], args[0].GetType()
_, intOverflow := c.typeInfer(ctx, argExpr)
_, intOverflow := c.typeInfer(argExpr)

var bf baseBuiltinFunc
switch argExprTp.EvalType() {
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6 changes: 6 additions & 0 deletions expression/integration_test.go
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Expand Up @@ -1943,6 +1943,12 @@ func (s *testIntegrationSuite) TestOpBuiltin(c *C) {
// for unaryPlus
result = tk.MustQuery(`select +1, +0, +(-9), +(-0.001), +0.999, +null, +"aaa"`)
result.Check(testkit.Rows("1 0 -9 -0.001 0.999 <nil> aaa"))
// for unaryMinus
tk.MustExec("drop table if exists f")
tk.MustExec("create table f(a decimal(65,0))")
tk.MustExec("insert into f value (-17000000000000000000)")
result = tk.MustQuery("select a from f")
result.Check(testkit.Rows("-17000000000000000000"))
}

func (s *testIntegrationSuite) TestDatetimeOverflow(c *C) {
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