CreateQuery x (children 3)
 Identifier x
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration CounterID (children 1)
    DataType UInt32
   ColumnDeclaration EventDate (children 1)
    DataType Date
   ColumnDeclaration UserID (children 1)
    DataType UInt64
 Storage definition (children 4)
  Function MergeTree
  Function toYYYYMM (children 1)
   ExpressionList (children 1)
    Identifier EventDate
  Function tuple (children 1)
   ExpressionList (children 3)
    Identifier CounterID
    Identifier EventDate
    Function intHash32 (children 1)
     ExpressionList (children 1)
      Identifier UserID
  Function intHash32 (children 1)
   ExpressionList (children 1)
    Identifier UserID
