docs: clarify calendar cube join requirements #10272
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- Both join dimensions must be of type time (timestamp) - The calendar cube's join dimension must be the primary_key
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This PR updates the calendar cubes documentation to clarify two important requirements when joining a calendar cube to other cubes:
time(timestamp). The dimension on the calendar cube side and the dimension on the other cube side must both be timestamp dimensions.primary_key. The dimension used in the join condition on the calendar cube side must haveprimary_key: trueset.These requirements are critical for calendar cubes to function correctly and were not previously documented.