Question: An existence bitmap has a bit for each record position, with the bit set to 1 if the record exists, and 0 if there is

An existence bitmap has a bit for each record position, with the bit set to 1 if the record exists, and 0 if there is no record at that position (for example, if the record were deleted). Show how to compute the existing bitmap from other bitmaps. Make sure that your technique works even in the presence of null values by using a bitmap for the value null.

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