calculated column with 2 equal sign (no var involved) - is this accepted practice?

[Anonymous]

Hi 
I came across the following calculated column:

Latest OH Test = 'OccupationalHealth'[Test Date] =
CALCULATE(
MAX('OccupationalHealth'[Test Date]),
FILTER(ALL('OccupationalHealth'), 'OccupationalHealth'[COID]=EARLIER('OccupationalHealth'[COID]))
)

[Test Date] is a date columns.  I was surprised to see this column turn to a true/false data type.  Is this documented anywhere or a known practice?

note the two equal signs (=) in the formula

thank you

[Zubair_Muhammad · Accepted solution]

Hi @Anonymous

This is common..It is just comparing a column value with a calculation

You can try this column as well

Calculated Column = 1=1

[Anonymous]

thank you!