ly923976094 commented on issue #3626: timezone problem URL: https://github.com/apache/incubator-pinot/issues/3626#issuecomment-450606079 > Yes, you are right the UDF converts each row rather than the result. It is required to ensure the right grouping happens after applying the UDF. However, in your case it is not necessary as one day already has one single millis value (which is a special case). We will explore on making this faster for your case (eg by caching the conversion). But in the meanwhile, is it possible for you to apply the conversion at the client side? Also, if you can share, are you already using Pinot in production, or evaluating may the moment? Get Outlook for iOS<https://aka.ms/o0ukef> > […](#) > ________________________________ From: Sun-Li <[email protected]> Sent: Sunday, December 30, 2018 6:37 PM To: apache/incubator-pinot Cc: Mayank Shrivastava; Comment Subject: Re: [apache/incubator-pinot] timezone problem (#3626) Thanks for sharing the information. From the second result it seems the query selects 1.2B records, which means too much computation needs to happen. Do you really need to store the data in milliseconds granularity? If not, preaggregating offline data after with larger granularity will reduce data size, and hence the the num records to process. May I ask which company/organization is this use case for? I work in sina weibo (Beijing), and my main work is the big data r&d engineer. The data of this table has been pre-aggregated for days outside, and the time stamp of day milliseconds is stored in pinot. In fact, if the time is not converted using SIMPLE_DATE_FORMAT, the query time is very fast (that is, the time zone cannot be specified, resulting in the mismatch between time and real time)，SIMPLE_DATE_FORMAT converts each piece of data rather than the query result — You are receiving this because you commented. Reply to this email directly, view it on GitHub<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fapache%2Fincubator-pinot%2Fissues%2F3626%23issuecomment-450602555&data=02%7C01%7Cmshrivas%40linkedin.com%7C1bd0d135f3bc43e14f7c08d66ec8e08b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636818206392019077&sdata=jyq4ddidHUIrBy9arNVd9vbyEo9%2BhEz0rz2yCfsZkBU%3D&reserved=0>, or mute the thread<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAMCAzZvCQfrd2iJhMGzisja0gF0cjxMfks5u-XhVgaJpZM4Zkbf0&data=02%7C01%7Cmshrivas%40linkedin.com%7C1bd0d135f3bc43e14f7c08d66ec8e08b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636818206392019077&sdata=fWpRMIwihaV8ju0T9FtWJmT6Twp0P%2FizqBJsquvfKIk%3D&reserved=0>.
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