示例#1
0
// Encodes datum at the end of key, using direction `dir` for the encoding.
// It takes in an inclusive key and returns an inclusive key if
// isLastEndConstraint is not set, and an exclusive key otherwise (the idea is
// that, for inclusive constraints, the value for the last column in the
// constraint needs to be adapted to an exclusive span.EndKey).
func encodeInclusiveEndValue(
	key roachpb.Key, datum parser.Datum, dir encoding.Direction, isLastEndConstraint bool,
) roachpb.Key {
	// Since the end of a span is exclusive, if the last constraint is an
	// inclusive one, we might need to make the key exclusive by applying a
	// PrefixEnd().  We normally avoid doing this by transforming "a = x" to
	// "a = x±1" for the last end constraint, depending on the encoding direction
	// (since this keeps the key nice and pretty-printable).
	// However, we might not be able to do the ±1.
	needExclusiveKey := false
	if isLastEndConstraint {
		if dir == encoding.Ascending {
			if datum.IsMax() || !datum.HasNext() {
				needExclusiveKey = true
			} else {
				datum = datum.Next()
			}
		} else {
			if datum.IsMin() || !datum.HasPrev() {
				needExclusiveKey = true
			} else {
				datum = datum.Prev()
			}
		}
	}
	key, err := sqlbase.EncodeTableKey(key, datum, dir)
	if err != nil {
		panic(err)
	}
	if needExclusiveKey {
		key = key.PrefixEnd()
	}
	return key
}
示例#2
0
func checkKeyCount(t *testing.T, kvDB *client.DB, prefix roachpb.Key, numKeys int) {
	if kvs, err := kvDB.Scan(context.TODO(), prefix, prefix.PrefixEnd(), 0); err != nil {
		t.Fatal(err)
	} else if l := numKeys; len(kvs) != l {
		t.Fatalf("expected %d key value pairs, but got %d", l, len(kvs))
	}
}
示例#3
0
// TODO(dt): Batch checks of many rows.
func (f baseFKHelper) check(values parser.DTuple) (parser.DTuple, error) {
	var key roachpb.Key
	if values != nil {
		keyBytes, _, err := sqlbase.EncodeIndexKey(
			f.searchTable, f.searchIdx, f.ids, values, f.searchPrefix)
		if err != nil {
			return nil, err
		}
		key = roachpb.Key(keyBytes)
	} else {
		key = roachpb.Key(f.searchPrefix)
	}
	spans := roachpb.Spans{roachpb.Span{Key: key, EndKey: key.PrefixEnd()}}
	if err := f.rf.StartScan(f.txn, spans, true /* limit batches */, 1); err != nil {
		return nil, err
	}
	return f.rf.NextRowDecoded()
}