CreateQuery check_system_tables_mv (children 3)
 Identifier check_system_tables_mv
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 3)
     Identifier name1
     Identifier name2
     Identifier name3
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier check_system_tables
 ViewTargets (children 1)
  Storage definition (children 2)
   Function MergeTree (children 1)
    ExpressionList
   Identifier name2
