That's a good point, Tim. Generally, new contributors might want to start with a newbie bug:
https://issues.apache.org/jira/issues/?jql=project%20%3D%20IMPALA%20AND%20status%20%3D%20Open%20AND%20labels%20%3D%20newbie JSON support is a larger project, and it might not be the one most amenable to learning about the Impala community's style and processes. On Tue, Apr 18, 2017 at 9:27 AM, Tim Armstrong <[email protected]> wrote: > Seems like useful functionality that would be great to have in Impala. > There was an earlier attempt to do this that didn't make it in - I'm not > sure that the approach was quite right: > https://gerrit.cloudera.org/#/c/1201/1 . I'm not sure what the exact > problems were but I remember we didn't think it was quite the right > approach. > > I think we'd need to talk through a design first because there are a lot of > considerations and we want to make sure to get it right. I had some initial > questions that I'd want to think through before adding a JSON scanner. > > - What JSON does it accept? > - How do we declare a table schema and map it to the JSON > - How does it handle missing or extra fields - does it just return null > or drop the fields? What if the field type is wrong? > - How do the numeric types work? JSON only supports floating point, but > I think many people would like to store higher-precision decimal or > 64-bit > integer types (which is technically outside of the JSON standard). > - Will it support codegen? If not, is it written in a way that allows it > in future? > > Cheers, > Tim > > - Tim > > On Tue, Apr 18, 2017 at 8:52 AM, Jim Apple <[email protected]> wrote: > > > On Mon, Apr 17, 2017 at 8:02 PM, yu feng <[email protected]> wrote: > > > > > Hi impala community: > > > I am Newly join to Impala, > > > > > > Welcome! > > > > I want to know what is the attitude of impala > > > community for supporting json format. > > > > > > I am in favor of it. I am only one person, though - anybody else object > to > > JSON support? > > > > If this match the roadmap, maybe I > > > can make some contribution. > > > > > > > I do not recall much talk about Apache Impala's roadmap since we joined > the > > ASF. Perhaps I missed a thread about it? > > >
