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 > > regards, tom lane >
