CreateQuery tree (children 3)
 Identifier tree
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration link (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType UInt64
   ColumnDeclaration data (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
