Il Lun 16 Mar 2020, 23:55 Julian Hyde ha scritto:
> Change the unparse operation for the dialect so that you generate UPSERT
> rather than MERGE.
>
> IIRC we did this for another dialect - maybe Phoenix.
>
Julian,
In my case (HerdDB) I need to see the presence of UPSERT in the RelNode
(Enumerabl
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Change the unparse operation for the dialect so that you generate UPSERT rather
than MERGE.
IIRC we did this for another dialect - maybe Phoenix.
Julian
> On Mar 16, 2020, at 1:22 AM, Enrico Olivelli wrote:
>
> Il Lun 16 Mar 2020, 09:06 Stamatis Zampetakis ha
> scritto:
>
>> Hi Enrico,
>
Interestingly, I was looking at this same piece of code not so long ago and
I agree it is a bit confusing.
Looking around the places that we obtain a RexExecutor, most often
(always?) we observe the following pattern:
RexExecutor executor =
Util.first(query.getCluster().getPlanner().getExecutor()
Thanks, the code is a little mess, here is how I understand it:
The executor from `final RexExecutor executor =
Util.first(cluster.getPlanner().getExecutor(), RexUtil.EXECUTOR)` is mainly
used to construct the RexSimplify, in the RexSimplify, the expression that we
evaluate is what we can make
Il Lun 16 Mar 2020, 09:06 Stamatis Zampetakis ha
scritto:
> Hi Enrico,
>
> I have the impression that UPSERT is currently supported only at the parser
> level [1] so it seems normal that you don't find something relevant in
> LogicalTableModify etc. Note that the SQL standard equivalent is the ME
Hi Enrico,
I have the impression that UPSERT is currently supported only at the parser
level [1] so it seems normal that you don't find something relevant in
LogicalTableModify etc. Note that the SQL standard equivalent is the MERGE
statement [2] but this also seems to be supported only at the
par
In method reduceExpressionsInternal, we get RexExecutor from cluster, it
can be null:
[image: image.png]
But in the outside(reduceExpressions), `final RexExecutor executor =
Util.first(cluster.getPlanner().getExecutor(),
RexUtil.EXECUTOR)`, it can't be null.
And reduceExpressions is the only cal
