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Computes a 32-bit hash of a value and returns a bitmap containing that hash.

func.bitmap_hash(<value>)
func.bitmap_hash('hello')
┌──────────┐
│ (bitmap) │
└──────────┘
BITMAP_HASH(<value>)
SELECT BITMAP_COUNT(BITMAP_HASH('hello'));
┌───┐
1
└───┘