CreateQuery f (children 3)
 Identifier f
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration k1 (children 1)
    DataType UInt64
   ColumnDeclaration k2 (children 1)
    DataType String
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration payload (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 3)
    Identifier k1
    Identifier k2
    Identifier id
