ColumnTag¶

class lsst.daf.relation.ColumnTag(*args, **kwargs)¶

An interface for objects that represent columns in a relation.

See Column Tags for details.

Attributes Summary

`is_key`	Whether this column can be used for deduplication and join equality-constraints (`bool`).
`qualified_name`	A string that is just as unique as this `ColumnTag` is, for use in engines that require a string for column names (`str`).

Attributes Documentation

is_key¶

Whether this column can be used for deduplication and join equality-constraints (bool).

Columns that are not keys are assumed to always be accompanied in relations by related key columns that should be used instead.

qualified_name¶

A string that is just as unique as this ColumnTag is, for use in engines that require a string for column names (str).

This does not need to be limited to avoid special characters; we assume it can and will be appropriately quoted when necessary.