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MySQL NDB Cluster API Developer Guide
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2.3.19.4 NdbDictionary::getNullBitOffset()

Description.  Get the offset of the given attribute ID's null bit from the start of the NdbRecord row. Returns false if the attribute ID is not present.

Signature. 

static bool getNullBitOffset
    (
      const NdbRecord* record,
      Uint32 attrId,
      Uint32& bytes,
      Uint32& bit
    )

Parameters.  An NdbRecord record in which to get the null bit offset of the given attribute ID (attrId). The offset is expressed as a number of bytes (bytes) plus a number of bits within the last byte (bit).

Return value.  Boolean false, if the attribute with the given ID is not present.