DescribeQuery (children 1)
 TableExpression (children 1)
  Function format (children 1)
   ExpressionList (children 2)
    Identifier JSONEachRow
    Literal \'{"data" : [[1, null, 3, null], [null, {"a" : 12, "b" : 12}, null, "string"], [null, null, 4, "string"]]}\'
