CreateQuery test_mv (children 3)
 Identifier test_mv
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Subquery (alias constant_value) (children 1)
      SelectWithUnionQuery (children 1)
       ExpressionList (children 1)
        SelectQuery (children 2)
         ExpressionList (children 1)
          Identifier regex
         TablesInSelectQuery (children 1)
          TablesInSelectQueryElement (children 1)
           TableExpression (children 1)
            TableIdentifier regex_test_table
    ExpressionList (children 1)
     Function extractAll (alias arr) (children 1)
      ExpressionList (children 2)
       Function concat (children 1)
        ExpressionList (children 2)
         Function toString (children 1)
          ExpressionList (children 1)
           Identifier number
         Literal \'a\'
       Function assumeNotNull (children 1)
        ExpressionList (children 1)
         Identifier constant_value
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test_table
 ViewTargets (children 1)
  Storage definition (children 2)
   Function MergeTree
   Identifier arr
