title: How to update datatype in Big query table?
body: <p>I have just started my POC in Big Query. I would like to know how to update/modify the column definition/schema  in an existing table.</p>
  
  <p>bq mk -t market.cust custid:integer,grp:integer,odate:string
  bq update -t market.cust custid:string,grp:integer,odate:string</p>
  
  <pre><code>**Error:
  spanda2040@instance-3:~/data$ bq update -t market.cust custid:string,grp:integer,odate:string
  BigQuery error in update operation: Provided Schema does not match Table arboreal-height-175822:market.cust. Field custid has changed type from INTEGER to STRING**
  </code></pre>
  
  <p>Table Schema:</p>
  
  <p>Last modified          Schema         Total Rows   Total Bytes   Expiration   Time Partitioning   Labels</p>
  
  <hr>
  
  <p>02 Oct 13:38:29   |- custid: integer   0            0
                      |- grp: integer
                      |- odate: string</p>