CreateQuery ref_items_flat (children 3)
 Identifier ref_items_flat
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration name (children 1)
    DataType String
   ColumnDeclaration score (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Identifier id
