lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData Class Reference

Inheritance diagram for lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData:

Public Member Functions
	__init__ (self, list[str] columns, list[tuple] rows)
None	set_column_types (self, dict[str, felis.datamodel.DataType] types)
Sequence[str]	column_names (self)
Sequence[tuple[str, felis.datamodel.DataType]]	column_defs (self)
Collection[tuple]	rows (self)
None	append (self, ApdbCassandraTableData other)
None	project (self, *, Iterable[str] drop=set())
Iterator[tuple]	__iter__ (self)

Protected Attributes
	_columns = columns
Collection[tuple]	_rows = rows
dict	_column_types = {}

Detailed Description

Implementation of ApdbTableData that wraps Cassandra raw data.

Member Function Documentation

__iter__()

Iterator[tuple] lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData.__iter__

(

self

)

Make it look like a row iterator, needed for some odd logic.

append()

None lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData.append	(		self,
		ApdbCassandraTableData	other )

Extend rows in this table with rows in other table

column_defs()

Sequence[tuple[str, felis.datamodel.DataType]] lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData.column_defs

(

self

)

Return ordered sequence of column names and their types.

Returns
-------
columns : `~collections.abc.Sequence` \
    [`tuple`[`str`, `felis.datamodel.DataType`]]
    Sequence of 2-tuples, each tuple consists of column name and its
    type.

Reimplemented from lsst.dax.apdb.apdbReplica.ApdbTableData.

column_names()

Sequence[str] lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData.column_names

(

self

)

Return ordered sequence of column names in the table.

Returns
-------
names : `~collections.abc.Sequence` [`str`]
    Column names.

Reimplemented from lsst.dax.apdb.apdbReplica.ApdbTableData.

project()

None lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData.project	(		self,
		*	,
		Iterable[str]	drop = set() )

Modify data in place by droppiing some columns.

rows()

Collection[tuple] lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData.rows

(

self

)

Return table rows, each row is a tuple of values.

Returns
-------
rows : `~collections.abc.Collection` [`tuple`]
    Collection of tuples.

Reimplemented from lsst.dax.apdb.apdbReplica.ApdbTableData.

set_column_types()

None lsst.dax.apdb.cassandra.cassandra_utils.ApdbCassandraTableData.set_column_types	(		self,
		dict[str, felis.datamodel.DataType]	types )

Update column types.

Parameters
----------
types : `dict`[`str`, `felis.datamodel.DataType`]
    Mapping of column name its type.

Notes
-----
Due to the way how instances of this class are constructed it is
impossible to pass types of columns to the constructor, instead we will
need to make a call to this method after construction.

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The documentation for this class was generated from the following file:

• python/lsst/dax/apdb/cassandra/cassandra_utils.py