Hi Chris, Thanks for the survey. Do you think I need to update the KIP to put all of these?
On Thu, May 9, 2024 at 4:14 PM Chris Egerton <chr...@aiven.io.invalid> wrote: > After doing a brief survey of the SMTs that ship with Connect, it seems > like these would also benefit: > > - HeaderFrom, which populates record headers with subfields of keys/values > [1] > - Cast, which performs type transformation on subfields of keys/values [2] > - SetSchemaMetadata, which (when the record key/value is a struct) copies > fields from the input struct to the output struct (which uses a different > schema) [3] > - TimestampConverter, which does similar input/output field copying to > SetSchemaMetadata [4] > - ReplaceField, which does similar input/output field copying to > SetSchemaMetadata and TimestampConverter > > [1] - > > https://github.com/apache/kafka/blob/f4fdaa702a2e718bdb44b9c5fec254f32a33f0d8/connect/transforms/src/main/java/org/apache/kafka/connect/transforms/HeaderFrom.java#L143 > [2] - > > https://github.com/apache/kafka/blob/f4fdaa702a2e718bdb44b9c5fec254f32a33f0d8/connect/transforms/src/main/java/org/apache/kafka/connect/transforms/Cast.java#L178 > [3] - > > https://github.com/apache/kafka/blob/f4fdaa702a2e718bdb44b9c5fec254f32a33f0d8/connect/transforms/src/main/java/org/apache/kafka/connect/transforms/SetSchemaMetadata.java#L174 > [4] - > > https://github.com/apache/kafka/blob/2a5efe4a334611fc7c15f76b322482bad0942db0/connect/transforms/src/main/java/org/apache/kafka/connect/transforms/TimestampConverter.java#L420 > [5] - > > https://github.com/apache/kafka/blob/f4fdaa702a2e718bdb44b9c5fec254f32a33f0d8/connect/transforms/src/main/java/org/apache/kafka/connect/transforms/ReplaceField.java#L183 > > On Thu, May 9, 2024 at 3:28 AM Mario Fiore Vitale <mvit...@redhat.com> > wrote: > > > Hi Chris, > > > > > Wouldn't ValueToKey [1] be applicable as well, for example? > > Yes, also that one can be affected. > > > > On Wed, May 8, 2024 at 5:59 PM Chris Egerton <chr...@aiven.io.invalid> > > wrote: > > > > > Wait, just one more thing--are there any other SMTs that could benefit > > from > > > this? Wouldn't ValueToKey [1] be applicable as well, for example? > > > > > > [1] - > > > > > > > > > https://github.com/apache/kafka/blob/2a5efe4a334611fc7c15f76b322482bad0942db0/connect/transforms/src/main/java/org/apache/kafka/connect/transforms/ValueToKey.java#L106 > > > > > > On Wed, May 8, 2024 at 11:46 AM Chris Egerton <chr...@aiven.io> wrote: > > > > > > > Hi Mario, > > > > > > > > I think we could have something like `copy` and `copyWithoutDefaults` > > to > > > > get around that, but now that you bring up compatibility, I think > it's > > > best > > > > to hold off on this. I'm forced to recall that anything we add to the > > > > Connect API may be used by plugin developers who write for the > bleeding > > > > edge of the Connect runtime, but deployed by users who are running on > > > > (possibly much) older versions. In that scenario, any use of new > Struct > > > > methods would cause issues at runtime caused by compatibility clashes > > > > between the newer API that the plugin was written for, and the older > > API > > > > that's provided by the runtime it's running on. > > > > > > > > Anyway, thanks for humoring me. The KIP looks good to me 👍 > > > > > > > > Cheers, > > > > > > > > Chris > > > > > > > > On Wed, May 8, 2024 at 10:50 AM Mario Fiore Vitale < > mvit...@redhat.com > > > > > > > wrote: > > > > > > > >> Hi Chris, > > > >> > > > >> Thanks for reviewing this. > > > >> > > > >> > It seems like the pattern of "copy the contents of this Struct > into > > > >> another > > > >> one for the purpose of mutation" could be fairly common in user code > > > bases > > > >> in addition to the core Connect SMTs. Do you think there's a way to > > > >> simplify this with, e.g., a Struct.putAll(Struct destination) or > > > >> Struct.copy(Schema destinationSchema) method? > > > >> > > > >> The only concern that I see is backward compatibility. Suppose that > > you > > > >> are > > > >> not using the JsonConvert but another convert that does't support > the > > > >> 'replace.null.with.default', when you use the current 'InsertField' > > smt > > > >> the null values will be replace by default values. If we replace the > > > >> "copy" > > > >> logic with a method in the Struct we remove this behavior. > > > >> > > > >> Isn't it? > > > >> > > > >> Mario. > > > >> > > > >> On Wed, May 8, 2024 at 2:14 PM Chris Egerton > <chr...@aiven.io.invalid > > > > > > >> wrote: > > > >> > > > >> > Hi Mario, > > > >> > > > > >> > Thanks for the KIP! Looks good overall. One quick thought--it > wasn't > > > >> > immediately obvious to me why we had to touch on InsertField for > > this. > > > >> It > > > >> > looks like the reason is that we use Struct::get [1] to create a > > clone > > > >> of > > > >> > the input value [2], instead of Struct::getWithoutDefault [3]. > > > >> > > > > >> > It seems like the pattern of "copy the contents of this Struct > into > > > >> another > > > >> > one for the purpose of mutation" could be fairly common in user > code > > > >> bases > > > >> > in addition to the core Connect SMTs. Do you think there's a way > to > > > >> > simplify this with, e.g., a Struct.putAll(Struct destination) or > > > >> > Struct.copy(Schema destinationSchema) method? > > > >> > > > > >> > [1] - > > > >> > > > > >> > > > > >> > > > > > > https://github.com/apache/kafka/blob/f74f596bc7d35fcea97edcd83244e5d6aee308d2/connect/api/src/main/java/org/apache/kafka/connect/data/Struct.java#L78-L91 > > > >> > [2] - > > > >> > > > > >> > > > > >> > > > > > > https://github.com/apache/kafka/blob/f74f596bc7d35fcea97edcd83244e5d6aee308d2/connect/transforms/src/main/java/org/apache/kafka/connect/transforms/InsertField.java#L179-L183 > > > >> > [3] - > > > >> > > > > >> > > > > >> > > > > > > https://github.com/apache/kafka/blob/f74f596bc7d35fcea97edcd83244e5d6aee308d2/connect/api/src/main/java/org/apache/kafka/connect/data/Struct.java#L93-L101 > > > >> > > > > >> > Cheers, > > > >> > > > > >> > Chris > > > >> > > > > >> > On Wed, May 8, 2024 at 3:40 AM Mario Fiore Vitale < > > mvit...@redhat.com > > > > > > > >> > wrote: > > > >> > > > > >> > > Hi All, > > > >> > > > > > >> > > I have created (through Mickael Maison's account since there was > > an > > > >> issue > > > >> > > creating a new one for me) KIP-1040[1] to improve handling of > > > nullable > > > >> > > values in InsertField/ExtractField transformations, this is > > required > > > >> > after > > > >> > > the introduction of KIP-581[2] that introduced the configuration > > > >> property > > > >> > > *replace.null.with.default* to *JsonConverter* to choose whether > > to > > > >> > replace > > > >> > > fields that have a default value and that are null to the > default > > > >> value. > > > >> > > > > > >> > > [1] > > > >> > > > > > >> > > > > >> > > > > > > https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=303794677 > > > >> > > [2] > > > >> > > > > > >> > > > > > >> > > > > >> > > > > > > https://cwiki.apache.org/confluence/display/KAFKA/KIP-581%3A+Value+of+optional+null+field+which+has+default+value > > > >> > > > > > >> > > Feedback and suggestions are welcome. > > > >> > > > > > >> > > Regards, > > > >> > > Mario. > > > >> > > -- > > > >> > > > > > >> > > Mario Fiore Vitale > > > >> > > > > > >> > > Senior Software Engineer > > > >> > > > > > >> > > Red Hat <https://www.redhat.com/> > > > >> > > <https://www.redhat.com/> > > > >> > > > > > >> > > > > >> > > > >> > > > >> -- > > > >> > > > >> Mario Fiore Vitale > > > >> > > > >> Senior Software Engineer > > > >> > > > >> Red Hat <https://www.redhat.com/> > > > >> <https://www.redhat.com/> > > > >> > > > > > > > > > > > > > -- > > > > Mario Fiore Vitale > > > > Senior Software Engineer > > > > Red Hat <https://www.redhat.com/> > > <https://www.redhat.com/> > > > -- Mario Fiore Vitale Senior Software Engineer Red Hat <https://www.redhat.com/> <https://www.redhat.com/>
