Обсуждение: ModifyTable EXPLAIN Node

Howdy,

I saw that Tom added the ModifyTable node to EXPLAIN output last week. I'd like to update my explanation extension to
useit, but I've no idea what it would look like. Could someone send me an example in the XML format? 

Thanks!

David

"David E. Wheeler" <david@kineticode.com> writes:
> I saw that Tom added the ModifyTable node to EXPLAIN output last week. I'd like to update my explanation extension to
useit, but I've no idea what it would look like. Could someone send me an example in the XML format?
 

It's already there in 9.0 --- I just added the relation-name property.
But since you ask:

regression=# explain (format xml) update int8_tbl set q1 = q1+1;                        QUERY PLAN
   
 
-------------------------------------------------------------<explain xmlns="http://www.postgresql.org/2009/explain">
+ <Query>                                                  +    <Plan>
+     <Node-Type>ModifyTable</Node-Type>                   +      <Operation>Update</Operation>
+     <Relation-Name>int8_tbl</Relation-Name>              +      <Alias>int8_tbl</Alias>
+     <Startup-Cost>0.00</Startup-Cost>                    +      <Total-Cost>1.06</Total-Cost>
+     <Plan-Rows>5</Plan-Rows>                             +      <Plan-Width>22</Plan-Width>
+     <Plans>                                              +        <Plan>
+         <Node-Type>Seq Scan</Node-Type>                  +
<Parent-Relationship>Member</Parent-Relationship>+         <Relation-Name>int8_tbl</Relation-Name>          +
<Alias>int8_tbl</Alias>                         +          <Startup-Cost>0.00</Startup-Cost>                +
<Total-Cost>1.06</Total-Cost>                   +          <Plan-Rows>5</Plan-Rows>                         +
<Plan-Width>22</Plan-Width>                     +        </Plan>                                            +
</Plans>                                            +    </Plan>                                                +
</Query>                                                +</explain>
 
(1 row)

        regards, tom lane

On Mar 7, 2011, at 4:41 PM, Tom Lane wrote:

> "David E. Wheeler" <david@kineticode.com> writes:
>> I saw that Tom added the ModifyTable node to EXPLAIN output last week. I'd like to update my explanation extension
touse it, but I've no idea what it would look like. Could someone send me an example in the XML format? 
>
> It's already there in 9.0 --- I just added the relation-name property.
> But since you ask:
>
> regression=# explain (format xml) update int8_tbl set q1 = q1+1;
>                         QUERY PLAN
> -------------------------------------------------------------
> <explain xmlns="http://www.postgresql.org/2009/explain">   +
>   <Query>                                                  +
>     <Plan>                                                 +
>       <Node-Type>ModifyTable</Node-Type>                   +
>       <Operation>Update</Operation>                        +

Oh, just new values for the Node-Type and Operation elements. That's okay, then. I thought it was a new <ModifyTable>
element.Great, nothing for me to change. 

And thanks for sending this to me, much appreciated.

Best,

David