CreateQuery t (children 3)
 Identifier t
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration c0 (children 1)
    DataType DateTime
   ColumnDeclaration c1 (children 1)
    DataType DateTime
   ColumnDeclaration a (children 2)
    DataType DateTime
    Function toStartOfFifteenMinutes (children 1)
     ExpressionList (children 1)
      Identifier c0
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList
