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ingres_field_length() returns
the length of a field. This is the number of bytes used by
the server to store the field. For detailed information, see
the Ingres/OpenAPI User Guide - Appendix C.
index is the number of
the field and must be between 1 and the value given by
ingres_num_fields().
See also ingres_query(),
ingres_fetch_array(),
ingres_fetch_object(), and
ingres_fetch_row().