The in-memory representation of a Bigtable cell.
Bigtable stores data in rows, indexes by row keys. Each row may contain multiple column families, each column family might contain multiple columns, and each column has multiple cells indexed by timestamp. Notice that the storage is sparse, column families, columns, and timestamps might contain zero cells.
The Cell class owns all its data.
Constructors
Cell(KeyType &&, std::string, ColumnType &&, std::int64_t, ValueType &&, std::vector< std::string >)
Creates a Cell and fill it with data.
This function does not participate in overload resolution if ValueType
is not an integral type. The case for integral types is handled by a separate overload.
row_key
KeyType &&
family_name
std::string
column_qualifier
ColumnType &&
timestamp
std::int64_t
value
ValueType &&
labels
std::vector< std::string >
typename KeyType
typename ColumnType
typename ValueType
Cell(KeyType &&, std::string, ColumnType &&, std::int64_t, std::int64_t, std::vector< std::string >)
Create a Cell and fill it with a 64-bit value encoded as big endian.
row_key
KeyType &&
family_name
std::string
column_qualifier
ColumnType &&
timestamp
std::int64_t
value
std::int64_t
labels
std::vector< std::string >
typename KeyType
typename ColumnType
Cell(KeyType &&, std::string, ColumnType &&, std::int64_t, ValueType &&)
Create a cell and fill it with data, but with empty labels.
row_key
KeyType &&
family_name
std::string
column_qualifier
ColumnType &&
timestamp
std::int64_t
value
ValueType &&
typename KeyType
typename ColumnType
typename ValueType
Functions
row_key() const
Return the row key this cell belongs to.
The returned value is not valid after this object is deleted.
RowKeyType const &
family_name() const
Return the family this cell belongs to.
The returned value is not valid after this object is deleted.
std::string const &
column_qualifier() const
Return the column this cell belongs to.
The returned value is not valid after this object is deleted.
ColumnQualifierType const &
timestamp() const
Return the timestamp of this cell.
std::chrono::microseconds
value() const &
Return the contents of this cell.
The returned value is not valid after this object is deleted.
CellValueType const &
value() &&
Return the contents of this cell.
CellValueType &&
decode_big_endian_integer() const
Interpret the value as a big-endian encoded T
and return it.
Google Cloud Bigtable stores arbitrary blobs in each cell. Some applications interpret these blobs as strings, other as encoded protos, and sometimes as big-endian integers. This is a helper function to convert the blob into a T value.
typename T
StatusOr< T >
labels() const
Return the labels applied to this cell by label transformer read filters.
std::vector< std::string > const &
