SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tmerge
   Function greaterOrEquals (children 1)
    ExpressionList (children 2)
     Identifier dt
     Literal \'2020-01-01 00:00:00\'
