Hrm, that's an interesting thought. Any interest in a real-time conversation?
This work is for Blaze <http://blaze.pydata.org/docs/latest/index.html> btw. I'm lowering a relational algebra abstraction to a variety of other systems (pandas, spark, python, sqlalchemy, etc...) On Mon, Sep 22, 2014 at 1:35 PM, Michael Bayer <mike...@zzzcomputing.com> wrote: > this is probably already apparent but if I had this sort of problem, I’d > more be asking why do I have this problem in the first place, that is, my > program has made these two SELECT objects that need to be combined, they > instead should be making two “data criteria” objects of some kind that can > be constructed into a statement later. that is, you need more abstraction > here and you need to bind to the SQL expression system later. > > > > > > On Sep 22, 2014, at 1:32 PM, Matthew Rocklin <mrock...@gmail.com> wrote: > > My current solution is to rely on `replace_selectable` but it's not > particularly robust. > > On Mon, Sep 22, 2014 at 1:30 PM, Michael Bayer <mike...@zzzcomputing.com> > wrote: > >> there’s no magic on that one, you’d need to probably write some routine >> that digs into each select() and does what you need, looking at >> stmt._whereclause and whatever else you want to pull from each one and then >> build up a new select() that does what you want. The introspection of a >> Select object is semi-public at this point but basic things like >> where/order_by etc. are directly available if you take a peek at the source. >> >> >> >> >> On Sep 22, 2014, at 1:26 PM, Matthew Rocklin <mrock...@gmail.com> wrote: >> >> Thanks for the response Michael. >> >> If you're interested, a follow-up question. >> >> >> http://stackoverflow.com/questions/25979620/sqlalchemy-join-expressions-without-nesting >> >> On Friday, September 19, 2014 10:21:05 AM UTC-4, Michael Bayer wrote: >>> >>> its at the bottom but i didn’t go through the effort to make an example…. >>> >>> On Sep 19, 2014, at 9:50 AM, Matthew Rocklin <mroc...@gmail.com> wrote: >>> >>> Inner_columns ended up being the solution on stack-overflow. The >>> current answer that provides this is somewhat convoluted though. >>> >>> If you wanted to say exactly what you just said on SO I'd be happy to >>> mark it as correct for future reference. >>> >>> On Fri, Sep 19, 2014 at 9:49 AM, Michael Bayer <mik...@zzzcomputing.com> >>> wrote: >>> >>>> you use with_only_columns but the columns you place into it must come >>>> from that list that was sent to the select() originally, and *not* the >>>> exported columns of the select itself. >>>> >>>> You either have to hold onto these columns externally, or get at them >>>> via the select.inner_columns accessor. >>>> >>>> >>>> >>>> On Sep 19, 2014, at 6:30 AM, Matthew Rocklin <mroc...@gmail.com> wrote: >>>> >>>> How can I reorder the columns in a SQLAlchemy query object without >>>> causing undue nesting? >>>> >>>> I've asked this question with an example on StackOverflow. Thought I'd >>>> advertise it here as well. Please let me know if this is not preferred. >>>> >>>> >>>> http://stackoverflow.com/questions/25914329/rearrange- >>>> columns-in-sqlalchemy-select-object >>>> >>>> >>>> Best, >>>> >>>> -Matthew >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "sqlalchemy" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to sqlalchemy+...@googlegroups.com. >>>> To post to this group, send email to sqlal...@googlegroups.com. >>>> Visit this group at http://groups.google.com/group/sqlalchemy. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>>> >>>> >>>> -- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "sqlalchemy" group. >>>> To unsubscribe from this topic, visit https://groups.google.com/d/ >>>> topic/sqlalchemy/OxowS9BhAKE/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> sqlalchemy+...@googlegroups.com. >>>> To post to this group, send email to sqlal...@googlegroups.com. >>>> Visit this group at http://groups.google.com/group/sqlalchemy. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "sqlalchemy" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to sqlalchemy+...@googlegroups.com. >>> To post to this group, send email to sqlal...@googlegroups.com. >>> Visit this group at http://groups.google.com/group/sqlalchemy. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "sqlalchemy" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to sqlalchemy+unsubscr...@googlegroups.com. >> To post to this group, send email to sqlalchemy@googlegroups.com. >> Visit this group at http://groups.google.com/group/sqlalchemy. >> For more options, visit https://groups.google.com/d/optout. >> >> >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "sqlalchemy" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/sqlalchemy/OxowS9BhAKE/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> sqlalchemy+unsubscr...@googlegroups.com. >> To post to this group, send email to sqlalchemy@googlegroups.com. >> Visit this group at http://groups.google.com/group/sqlalchemy. >> For more options, visit https://groups.google.com/d/optout. >> > > > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to a topic in the > Google Groups "sqlalchemy" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/sqlalchemy/OxowS9BhAKE/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. 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