vitessio/vitess · error

err

Error message

err

What it means

sqltypes.TestBindVariable is a test-only helper that builds a *querypb.BindVariable from an arbitrary Go value. It panics if BuildBindVariable rejects the value, since in tests a bind variable should always be constructible. Passing a value of an unsupported type turns a silent failure into an immediate test crash.

Source

Thrown at go/sqltypes/testing.go:134

		result.Fields = nil
		result.RowsAffected = 0
		results = append(results, result)
		start = cur + 1
		cur = start
	}
	return results
}

// TestBindVariable makes a *querypb.BindVariable from any.
// It panics on invalid input.
// This function should only be used for testing.
func TestBindVariable(v any) *querypb.BindVariable {
	if v == nil {
		return NullBindVariable
	}
	bv, err := BuildBindVariable(v)
	if err != nil {
		panic(err)
	}
	return bv
}

// TestValue builds a Value from typ and val.
// This function should only be used for testing.
func TestValue(typ querypb.Type, val string) Value {
	return MakeTrusted(typ, []byte(val))
}

// TestTuple builds a tuple Value from a list of Values.
// This function should only be used for testing.
func TestTuple(vals ...Value) Value {
	return Value{
		typ: uint16(Tuple),
		val: encodeTuple(vals),
	}
}

View on GitHub (pinned to 01a25a7d17)

Solutions

1. Pass only supported scalar types (int/int64/uint64/float64/string/[]byte/bool/time.Time or nil)
2. Convert unsupported values to a supported representation (e.g. fmt.Sprintf to string or serialize to []byte) before wrapping
3. Use BuildBindVariable directly and handle the error when the value type is uncertain

Example fix

// before
bv := sqltypes.TestBindVariable(myStruct{}) // panics
// after
data, err := json.Marshal(myStruct{})
require.NoError(t, err)
bv := sqltypes.TestBindVariable(data)

if _, err := sqltypes.BuildBindVariable(v); err != nil {
    // unsupported type — convert or handle before TestBindVariable
}

func isSupportedBindType(v any) bool {
    switch v.(type) {
    case nil, string, []byte, bool, int, int64, uint64, float64, time.Time:
        return true
    }
    return false
}

When it happens

Trigger: Calling TestBindVariable(v) with a v whose type BuildBindVariable does not support (e.g. a struct, map, channel, or a custom type outside the supported set: numbers, strings, bytes, bools, time, nil, etc.).

Common situations: Test refactors passing typed helper structs or pointers instead of primitives; passing a typed nil that isn't handled; using TestBindVariable outside unit tests where runtime errors would be preferable.

Related errors

• %s: %v
• type %T not supported as bind var: %v
• cannot parse VTPORTSTART: %v
• panic: %v
• SetIdleTimeout called when timer not initialized

AI-assisted analysis of vitessio/vitess@01a25a7d17 (2026-09-01). Data as JSON: /api/errors/8066dca7ec083ce1. Report an issue: GitHub.