CreateQuery t1 (children 3)
 Identifier t1
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration date (children 1)
    DataType Date
   ColumnDeclaration s1 (children 1)
    DataType String
   ColumnDeclaration s2 (children 1)
    DataType String
 Storage definition (children 4)
  Function MergeTree (children 1)
   ExpressionList
  Function toYYYYMMDD (children 1)
   ExpressionList (children 1)
    Identifier date
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier date
    Identifier s1
  Set