Hi I need advice. ResetExprContext(econtext) is defined as MemoryContextReset((econtext)->ecxt_per_tuple_memory). I can register callback in MemoryContext but it is always cleaned on every call to MemoryContextReset(). How to reset some fields of ExprContext ( living in per_query_memory ) when ResetExprContext is called ?
czw., 31 paź 2019 o 16:52 Andres Freund <and...@anarazel.de> napisał(a): > Hi, > > On October 31, 2019 8:51:11 AM PDT, Andrzej Barszcz <abus...@gmail.com> > wrote: > >x <> 0 is evaluated first, 1/x only when x <> 0, not ? > > > >czw., 31 paź 2019 o 16:45 Tom Lane <t...@sss.pgh.pa.us> napisał(a): > > > >> Andres Freund <and...@anarazel.de> writes: > >> > Potentially related note: for nodes like seqscan, combining the > >qual and > >> projection processing into one expression seems to be a noticable win > >(at > >> least when taking care do emit two different sets of deform > >expression > >> steps). > >> > >> There's just one problem: that violates SQL semantics, and not in > >> a small way. > >> > >> select 1/x from tab where x <> 0 > > On postgres lists the policy is to reply below the quoted bit, and to trim > the quote appropriately. > > Andres > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. >
