Method getFunction

pkg/expression/builtin_arithmetic.go:329–372

(ctx BuildContext, args []Expression)

}

func (c *arithmeticMinusFunctionClass) getFunction(ctx BuildContext, args []Expression) (builtinFunc, error) {
	if err := c.verifyArgs(args); err != nil {
		return nil, err
	}
	if args[0].GetType(ctx.GetEvalCtx()).EvalType().IsVectorKind() || args[1].GetType(ctx.GetEvalCtx()).EvalType().IsVectorKind() {
		bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETVectorFloat32, types.ETVectorFloat32, types.ETVectorFloat32)
		if err != nil {
			return nil, err
		}
		sig := &builtinArithmeticMinusVectorFloat32Sig{bf}
		// sig.setPbCode(tipb.ScalarFuncSig_PlusVectorFloat32)
		return sig, nil
	}
	lhsEvalTp, rhsEvalTp := numericContextResultType(ctx.GetEvalCtx(), args[0]), numericContextResultType(ctx.GetEvalCtx(), args[1])
	if lhsEvalTp == types.ETReal || rhsEvalTp == types.ETReal {
		bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETReal, types.ETReal, types.ETReal)
		if err != nil {
			return nil, err
		}
		setFlenDecimal4RealOrDecimal(ctx.GetEvalCtx(), bf.tp, args[0], args[1], true, false)
		sig := &builtinArithmeticMinusRealSig{bf}
		sig.setPbCode(tipb.ScalarFuncSig_MinusReal)
		return sig, nil
	} else if lhsEvalTp == types.ETDecimal || rhsEvalTp == types.ETDecimal {
		bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETDecimal, types.ETDecimal, types.ETDecimal)
		if err != nil {
			return nil, err
		}
		setFlenDecimal4RealOrDecimal(ctx.GetEvalCtx(), bf.tp, args[0], args[1], false, false)
		sig := &builtinArithmeticMinusDecimalSig{bf}
		sig.setPbCode(tipb.ScalarFuncSig_MinusDecimal)
		return sig, nil
	}
	bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, types.ETInt, types.ETInt)
	if err != nil {
		return nil, err
	}
	if (mysql.HasUnsignedFlag(args[0].GetType(ctx.GetEvalCtx()).GetFlag()) || mysql.HasUnsignedFlag(args[1].GetType(ctx.GetEvalCtx()).GetFlag())) && !ctx.GetEvalCtx().SQLMode().HasNoUnsignedSubtractionMode() {
		bf.tp.AddFlag(mysql.UnsignedFlag)
	}
	sig := &builtinArithmeticMinusIntSig{baseBuiltinFunc: bf}
	sig.setPbCode(tipb.ScalarFuncSig_MinusInt)
	return sig, nil
}

type builtinArithmeticMinusRealSig struct {
	baseBuiltinFunc