Thanks for reminding me, I very glad to do some contribution for impala, I will try to solve IMPALA-5016 <https://issues.apache.org/jira/browse/IMPALA-5016> once I have time, and keep communication with community.
2017-05-10 12:59 GMT+08:00 Alexander Behm <[email protected]>: > Hi Yu, > > glad to hear that you are considering contributing to Impala! As others > have mentioned before, I'd strongly recommend starting with a smaller task > to get accustomed our development workflows. > > I'm happy to help with finding a suitable task. For example, you might find > this JIRA interesting: > https://issues.apache.org/jira/browse/IMPALA-5016 > > Please do reach out if I can help. > > Alex > > On Tue, Apr 18, 2017 at 10:55 AM, Alexander Behm <[email protected]> > wrote: > > > The existing attempt used the Rapidjson library to do the parsing. > > Unfortunately, the Rapidjson API is not very convenient for Impala > because > > it returns typed data, i.e., it internally converts to > > float/double/int/whatever which is problematic for decimal (among > others). > > Ideally, we would use the same Impala code to convert data types from > > strings. > > > > 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? > >> > > >> > > > > >
