Function dpiSodaColl_dropIndex 

pub unsafe extern "C" fn dpiSodaColl_dropIndex(
    coll: *mut dpiSodaColl,
    name: *const c_char,
    nameLength: u32,
    flags: u32,
    isDropped: *mut c_int,
) -> c_int

Drop an index on the collection.

The function returns DPI_SUCCESS for success and DPI_FAILURE for failure.