CreateQuery tab (children 3)
 Identifier tab
 Columns definition (children 2)
  ExpressionList (children 4)
   ColumnDeclaration n (children 1)
    DataType UInt32
   ColumnDeclaration x (children 1)
    DataType UInt32
   ColumnDeclaration y (children 1)
    DataType UInt32
   ColumnDeclaration z (children 1)
    DataType UInt32
  ExpressionList (children 1)
   Projection (children 1)
    ProjectionSelectQuery (children 2)
     ExpressionList (children 1)
      Function count (children 1)
       ExpressionList
     ExpressionList (children 2)
      Identifier x
      Identifier z
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
