title: flink sql how to do explode(array)=== if we use array to pase a json how to do explode () in flinksql---does flink support explode
body: <p>see example :
  create table conv (
  SM ROW(objectType STRING, verb string, actor ROW(orgId string), object ROW(contentCategory string, links ARRAY&lt;ROW(ecmType STRING)&gt;)),
  <code>timestamp</code> string</p>
  <p>)
  WITH (
  'connector' = 'kafka', -- using kafka connector
  'topic' = 'sj1_spark_conv_hdfs',
  )</p>
  <p>how to use explode on SM.object.ecmType instead of using ecmType[1]</p>