CreateQuery h (children 3)
 Identifier h
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration EventDate (children 1)
    DataType Date
   ColumnDeclaration CounterID (children 1)
    DataType UInt64
   ColumnDeclaration WatchID (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier CounterID
    Identifier EventDate
