ORA-13457: bitmap mask cell data error: string

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ORA-13457: bitmapmask cell data error: string
Cause: Therewas an error in the cell data of an original bitmap mask or in the cell
data of the pyramids of a bitmap mask.
Action: Ifthe error is related to an original bitmap mask, remove the bitmap
mask. If the error is related to the pyramids of a bitmap mask, delete thepyramids
and regenerate them.