ORA-13432：NULL or invalid blankCellValue
错误码
错误描述：NULL or invalid blankCellValue
错误原因：The blankCellValue element could not be found in the metadata of a blank GeoRaster object, or the specified blankCellValue element value was NULL or invalid.
解决方法：Call the SDO_GEOR.setBlankCellValue package to add blankCellValue to the metadata whenever the isBlank element value is TRUE, and ensure that the specified blankCellValue element value is not NULL and is in the range as designated by the cellDepth definition of the GeoRaster object.
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