CreateQuery trend (children 3)
 Identifier trend
 Columns definition (children 1)
  ExpressionList (children 5)
   ColumnDeclaration event_date (children 1)
    DataType Date
   ColumnDeclaration user_id (children 1)
    DataType Int32
   ColumnDeclaration timestamp (children 1)
    DataType DateTime
   ColumnDeclaration eventID (children 1)
    DataType Int32
   ColumnDeclaration product (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Function toYYYYMM (children 1)
   ExpressionList (children 1)
    Identifier event_date
  Identifier user_id
