title: How convert blob data type into R data type (character or logical)
body: <p>I am reading data from database using <em>odbc</em> driver. I try to use <em>dplyr</em> syntax:</p>
  <pre><code>df &lt;- tbl(con, tbl_name) %&gt;%
      select(...) %&gt;%
      filter(...) %&gt;%
      collect()
  </code></pre>
  <p>But most of fields from tbl_name marked as <em>blob</em> type. I know some of them is character (starts with zeros and marked as blob[16 B], some logical (marked as blob[1 B]). Can I convert them to the R data type for manipulate?</p>
  <p>Also one field have datetime type. I want to use it in filter  - what date type I must to use in expression?  I use <code>'2020-01-01 00:00:00'</code>, <code>as.POSIxt()</code> - not work.</p>