Golang Timestamp.Logical方法代碼示例

// isAsOf analyzes a select statement to bypass the logic in newPlan(),
// since that requires the transaction to be started already. If the returned
// timestamp is not nil, it is the timestamp to which a transaction should
// be set.
//
// max is a lower bound on what the transaction's timestamp will be. Used to
// check that the user didn't specify a timestamp in the future.
func isAsOf(planMaker *planner, stmt parser.Statement, max hlc.Timestamp) (*hlc.Timestamp, error) {
	s, ok := stmt.(*parser.Select)
	if !ok {
		return nil, nil
	}
	sc, ok := s.Select.(*parser.SelectClause)
	if !ok {
		return nil, nil
	}
	if sc.From == nil || sc.From.AsOf.Expr == nil {
		return nil, nil
	}
	te, err := sc.From.AsOf.Expr.TypeCheck(nil, parser.TypeString)
	if err != nil {
		return nil, err
	}
	d, err := te.Eval(&planMaker.evalCtx)
	if err != nil {
		return nil, err
	}
	var ts hlc.Timestamp
	switch d := d.(type) {
	case *parser.DString:
		// Allow nanosecond precision because the timestamp is only used by the
		// system and won't be returned to the user over pgwire.
		dt, err := parser.ParseDTimestamp(string(*d), time.Nanosecond)
		if err != nil {
			return nil, err
		}
		ts.WallTime = dt.Time.UnixNano()
	case *parser.DInt:
		ts.WallTime = int64(*d)
	case *parser.DDecimal:
		// Format the decimal into a string and split on `.` to extract the nanosecond
		// walltime and logical tick parts.
		s := d.String()
		parts := strings.SplitN(s, ".", 2)
		nanos, err := strconv.ParseInt(parts[0], 10, 64)
		if err != nil {
			return nil, errors.Wrap(err, "parse AS OF SYSTEM TIME argument")
		}
		var logical int64
		if len(parts) > 1 {
			// logicalLength is the number of decimal digits expected in the
			// logical part to the right of the decimal. See the implementation of
			// cluster_logical_timestamp().
			const logicalLength = 10
			p := parts[1]
			if lp := len(p); lp > logicalLength {
				return nil, errors.Errorf("bad AS OF SYSTEM TIME argument: logical part has too many digits")
			} else if lp < logicalLength {
				p += strings.Repeat("0", logicalLength-lp)
			}
			logical, err = strconv.ParseInt(p, 10, 32)
			if err != nil {
				return nil, errors.Wrap(err, "parse AS OF SYSTEM TIME argument")
			}
		}
		ts.WallTime = nanos
		ts.Logical = int32(logical)
	default:
		return nil, fmt.Errorf("unexpected AS OF SYSTEM TIME argument: %s (%T)", d.ResolvedType(), d)
	}
	if max.Less(ts) {
		return nil, fmt.Errorf("cannot specify timestamp in the future")
	}
	return &ts, nil
}

func TestBatchBuilderStress(t *testing.T) {
	defer leaktest.AfterTest(t)()

	stopper := stop.NewStopper()
	defer stopper.Stop()
	e := NewInMem(roachpb.Attributes{}, 1<<20)
	stopper.AddCloser(e)

	rng, _ := randutil.NewPseudoRand()

	for i := 0; i < 1000; i++ {
		count := 1 + rng.Intn(1000)

		func() {
			batch := e.NewBatch().(*rocksDBBatch)
			// Ensure that, even though we reach into the batch's internals with
			// dbPut etc, asking for the batch's Repr will get data from C++ and
			// not its unused builder.
			batch.flushes++
			defer batch.Close()

			builder := &RocksDBBatchBuilder{}

			for j := 0; j < count; j++ {
				var ts hlc.Timestamp
				if rng.Float32() <= 0.9 {
					// Give 90% of keys timestamps.
					ts.WallTime = rng.Int63()
					if rng.Float32() <= 0.1 {
						// Give 10% of timestamps a non-zero logical component.
						ts.Logical = rng.Int31()
					}
				}
				key := MVCCKey{
					Key:       []byte(fmt.Sprintf("%d", rng.Intn(10000))),
					Timestamp: ts,
				}
				// Generate a random mixture of puts, deletes and merges.
				switch rng.Intn(3) {
				case 0:
					if err := dbPut(batch.batch, key, []byte("value")); err != nil {
						t.Fatal(err)
					}
					builder.Put(key, []byte("value"))
				case 1:
					if err := dbClear(batch.batch, key); err != nil {
						t.Fatal(err)
					}
					builder.Clear(key)
				case 2:
					if err := dbMerge(batch.batch, key, appender("bar")); err != nil {
						t.Fatal(err)
					}
					builder.Merge(key, appender("bar"))
				}
			}

			batchRepr := batch.Repr()
			builderRepr := builder.Finish()
			if !bytes.Equal(batchRepr, builderRepr) {
				t.Fatalf("expected [% x], but got [% x]", batchRepr, builderRepr)
			}
		}()
	}
}