CreateQuery event (children 3)
 Identifier event
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration id (children 1)
    DataType Int64
   ColumnDeclaration user_id (children 1)
    DataType Int64
   ColumnDeclaration content (children 1)
    DataType String
   ColumnDeclaration created_time (children 1)
    DataType DateTime
 Storage definition (children 2)
  Function MergeTree
  Identifier user_id
