CreateQuery t1 (children 4)
 Identifier t1
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType DateTime64 (children 1)
     ExpressionList (children 1)
      Literal UInt64_3
   ColumnDeclaration b (children 1)
    DataType FixedString (children 1)
     ExpressionList (children 1)
      Literal UInt64_6
 Storage definition (children 3)
  Function MergeTree
  Function toStartOfDay (children 1)
   ExpressionList (children 1)
    Identifier a
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier a
    Identifier b
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 2)
     Literal \'2023-01-01 00:00:00.000\'
     Literal \'fd4c03\'
