IteratorSize() returns unknown size

Author: aplavin

src/SQLCollections.jl

@@ -49,6 +49,7 @@ exists(dbc::SQLCollection) =
 Base.collect(dbc::SQLCollection) = StructArray(dbc)
 
 Base.eltype(dbc::SQLCollection) = @p dbc first(__, 0) collect eltype
+Base.IteratorSize(::Type{<:SQLCollection}) = Base.SizeUnknown()
 
 (::Type{StructArray})(dbc::SQLCollection) = DBInterface.execute(dbc.conn, dbc.query) |> columntable |> StructArray
 (::Type{StructVector})(dbc::SQLCollection) = StructArray(dbc)