CreateQuery union1 (children 3)
 Identifier union1
 Columns definition (children 1)
  ExpressionList (children 5)
   ColumnDeclaration date (children 1)
    DataType Date
   ColumnDeclaration a (children 1)
    DataType Int32
   ColumnDeclaration b (children 1)
    DataType Int32
   ColumnDeclaration c (children 1)
    DataType Int32
   ColumnDeclaration d (children 1)
    DataType Int32
 Storage definition (children 1)
  Function MergeTree (children 1)
   ExpressionList (children 3)
    Identifier date
    Function tuple (children 1)
     ExpressionList (children 2)
      Identifier a
      Identifier date
    Literal UInt64_8192