CreateQuery old_format_mt (children 3)
 Identifier old_format_mt
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration event_date (children 1)
    DataType Date
   ColumnDeclaration key (children 1)
    DataType UInt64
   ColumnDeclaration value1 (children 1)
    DataType UInt64
   ColumnDeclaration value2 (children 1)
    DataType String
 Storage definition (children 1)
  Function MergeTree (children 1)
   ExpressionList (children 3)
    Identifier event_date
    Function tuple (children 1)
     ExpressionList (children 2)
      Identifier key
      Identifier value1
    Literal UInt64_8192
