TimespanProxy

class lsst.daf.butler.queries.expression_factory.TimespanProxy(expression: IntColumnLiteral | StringColumnLiteral | FloatColumnLiteral | HashColumnLiteral | UUIDColumnLiteral | DateTimeColumnLiteral | TimespanColumnLiteral | RegionColumnLiteral | DimensionKeyReference | DimensionFieldReference | DatasetFieldReference | UnaryExpression | BinaryExpression)

Bases: ExpressionProxy

An ExpressionProxy specialized for timespan columns and literals.

Parameters:

expressiontree.ColumnExpression

Expression that backs this proxy.

Attributes Summary

begin	An expression representing the lower bound (inclusive).
end	An expression representing the upper bound (exclusive).
is_null	A boolean expression that tests whether this expression is NULL.

Methods Summary

overlaps(other)

Return a boolean expression representing an overlap test between this timespan and another timespan or a datetime.

Attributes Documentation

begin

An expression representing the lower bound (inclusive).

end

An expression representing the upper bound (exclusive).

is_null

A boolean expression that tests whether this expression is NULL.

Methods Documentation

overlaps(other: TimespanProxy | Timespan | astropy.time.Time) → tree.Predicate

Return a boolean expression representing an overlap test between this timespan and another timespan or a datetime.

Parameters:

otherTimespanProxy or Timespan

Expression or literal to compare to.

Returns:

predicatetree.Predicate

Boolean expression object.