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MySQL NDB Cluster API Developer Guide
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2.3.4.6 Dictionary::createHashMap()

Description.  Creates a HashMap.

Signature. 

int createHashMap
    (
      const HashMap& hashmap,
      ObjectId* id = 0
    )

Parameters.  A reference to the hash map, and, optionally, an ID to be assigned to it. Added in NDB 7.2.7.

Return value.  Returns 0 on success; on failure, returns -1 and sets an error.