CreateQuery tba (children 3)
 Identifier tba
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration event_id (children 1)
    DataType Int64
   ColumnDeclaration event_dt (children 1)
    DataType Int64
 Storage definition (children 2)
  Function MergeTree
  Identifier event_id
