CreateQuery set (children 4)
 Identifier set
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration s (children 1)
    DataType String
 Storage definition (children 1)
  Function Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Function arrayJoin (children 1)
      ExpressionList (children 1)
       Literal Array_[\'src_table_1\', \'src_table_2\']
