CreateQuery requests (children 3)
 Identifier requests
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration event_time (children 1)
    DataType DateTime
   ColumnDeclaration event_date (children 2)
    DataType Date
    Function toDate (children 1)
     ExpressionList (children 1)
      Identifier event_time
   ColumnDeclaration event_tm (children 2)
    DataType DateTime
    Identifier event_time
 Storage definition (children 2)
  Function MergeTree
  Identifier event_time
