Function grn_expr_syntax_expand_query 

pub unsafe extern "C" fn grn_expr_syntax_expand_query(
    ctx: *mut grn_ctx,
    query: *const c_char,
    query_size: c_int,
    flags: grn_expr_flags,
    expander: *mut grn_obj,
    expanded_query: *mut grn_obj,
) -> grn_rc