func (set TargetIDSet) Union(sset TargetIDSet) TargetIDSet {
	nset := set.Clone()

	for k := range sset {
		nset.add(k)
	}

	return nset
}

// Difference - returns difference with given set as new set.
func (set TargetIDSet) Difference(sset TargetIDSet) TargetIDSet {
	nset := NewTargetIDSet()
	for k := range set {
		if _, ok := sset[k]; !ok {
			nset.add(k)
		}
	}

	return nset
}

					return tx
				}

				refColumns := []clause.Column{}
				for _, rel := range relation.References {
					if rel.OwnPrimaryKey {
						refColumns = append(refColumns, clause.Column{Name: rel.ForeignKey.DBName})
					}
				}

				if len(refColumns) != 0 {
					selectExpr := clause.CommaExpression{}
					for _, column := range q.db.Statement.Selects {

	// Note these errors should be independent of the architecture.
	// Just run the test with amd64.
	parser := newParser("amd64")
	var buf strings.Builder
	parser.errorWriter = &buf

	for _, cat := range testcats {
		for _, test := range cat.tests {
			parser.allowABI = cat.allowABI
			parser.errorCount = 0
			parser.lineNum++
			if !parser.pseudo(test.pseudo, tokenize(test.operands)) {

	}
	defer zipFile.Close()
	fmtZipW := zip.NewWriter(zipFile)
	defer fmtZipW.Close()
	for _, pool := range pools { // for each pool
		setCount, setDriveCount := pool.SetCount, pool.DrivesPerSet
		format := newFormatErasureV3(setCount, setDriveCount)
		format.ID = deploymentID
		for i := range setCount { // for each erasure set
			for j := range setDriveCount {
				newFormat := format.Clone()
				newFormat.Erasure.This = format.Erasure.Sets[i][j]

func TestRemoveInternalEntries(t *testing.T) {
	isEqual := func(x, y map[string]string) bool {
		if len(x) != len(y) {
			return false
		}
		for k, v := range x {
			if u, ok := y[k]; !ok || v != u {
				return false
			}
		}
		return true
	}

	for i, test := range removeInternalEntriesTests {
		RemoveInternalEntries(test.Metadata)
		if !isEqual(test.Metadata, test.Expected) {

	<li>the index <code>x</code> is <i>in range</i> if <code>0 &lt;= x &lt; len(a)</code>,
	    otherwise it is <i>out of range</i></li>
</ul>

<p>
For <code>a</code> of <a href="#Array_types">array type</a> <code>A</code>:
</p>
<ul>
	<li>a <a href="#Constants">constant</a> index must be in range</li>
	<li>if <code>x</code> is out of range at run time,

		resourceMetricsMapMu.RLock()
		defer resourceMetricsMapMu.RUnlock()
		for _, subSys := range subSystems {
			stats, found := resourceMetricsMap[subSys]
			if found {
				requireAvgMax := true
				if subSys == driveSubsystem {
					requireAvgMax = false
				}
				for _, m := range stats {
					metrics = append(metrics, prepareResourceMetrics(m, subSys, requireAvgMax)...)
				}
			}
		}

		}
		for i, w := range writers {
			if w == nil {
				disks[i] = OfflineDisk
			}
		}
		if err == nil {
			if length := int64(len(data[test.offset:])); n != length {
				t.Errorf("Test %d: invalid number of bytes written: got: #%d want #%d", i, n, length)
			}
			writers := make([]io.Writer, len(disks))
			for i, disk := range disks {
				if disk == nil {
					continue
				}

}

// Close all the readers.
func closeBitrotReaders(rs []io.ReaderAt) {
	for _, r := range rs {
		if r != nil {
			if br, ok := r.(io.Closer); ok {
				br.Close()
			}
		}
	}
}

// Close all the writers.
func closeBitrotWriters(ws []io.Writer) []error {
	errs := make([]error, len(ws))
	for i, w := range ws {
		if w == nil {
			errs[i] = errDiskNotFound
			continue
		}

	if err != nil {
		return
	}
	err = en.WriteMapHeader(uint32(len(z.Stats)))
	if err != nil {
		err = msgp.WrapError(err, "Stats")
		return
	}
	for za0001, za0002 := range z.Stats {
		err = en.WriteString(za0001)
		if err != nil {
			err = msgp.WrapError(err, "Stats")
			return
		}
		if za0002 == nil {
			err = en.WriteNil()
			if err != nil {
				return
			}