You should be able to use ReST API [GET MEthod] to fetch column,listing whose data type is "Integer" or "Number".
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are you wanting to search for both the DataType and Length?
the issue is that you can only search for facts that are indexed. In the relational and file system models the datatype and length is not indexed (com.infa.ldm.relational.Datatype, com.infa.ldm.relational.DatatypeLength, com.infa.ldm.file.DatatypeLength, com.infa.ldm.file.Datatype)