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Posted to commits@hudi.apache.org by "bithw1 (via GitHub)" <gi...@apache.org> on 2023/04/03 12:09:42 UTC

[GitHub] [hudi] bithw1 opened a new issue, #8370: [SUPPORT]What's the difference between time-travel-query and point-in-time-query in the doc.

bithw1 opened a new issue, #8370:
URL: https://github.com/apache/hudi/issues/8370

   I am reading at https://hudi.apache.org/docs/quick-start-guide#time-travel-query and https://hudi.apache.org/docs/quick-start-guide#point-in-time-query.
   
   
   Below are the two examples for the time travel query and point in time query. But it looks to me that these two queries are doing the same thing:  they are both doing the `snapshot query` until the time:20210728141108100.
   
   Not sure I have understood correctly ,but I wonder why the query examples have two different names(time travel query vs point in time query).
   
   
   For the time travel query, the example in the doc is:
   
   ```
   spark.read.
     format("hudi").
     option("as.of.instant", "20210728141108100").
     load(basePath)
   
   ```
   
   For the point in time query, the example in the doc is:
   
   ````
   val beginTime = "000"  /// the begin time is 000,denoting the earlist commit
   val endTime = "20210728141108100"
   
   //incrementally query data
   val tripsPointInTimeDF = spark.read.format("hudi").
     option(QUERY_TYPE_OPT_KEY, QUERY_TYPE_INCREMENTAL_OPT_VAL).
     option(BEGIN_INSTANTTIME_OPT_KEY, beginTime).
     option(END_INSTANTTIME_OPT_KEY, endTime).
     load(basePath)
   tripsPointInTimeDF.createOrReplaceTempView("hudi_trips_point_in_time")
   spark.sql
   
   ````
   
   
   


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[GitHub] [hudi] bithw1 closed issue #8370: [SUPPORT]What's the difference between time-travel-query and point-in-time-query in the doc.

Posted by "bithw1 (via GitHub)" <gi...@apache.org>.
bithw1 closed issue #8370: [SUPPORT]What's the difference between time-travel-query and point-in-time-query in the doc. 
URL: https://github.com/apache/hudi/issues/8370


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[GitHub] [hudi] ad1happy2go commented on issue #8370: [SUPPORT]What's the difference between time-travel-query and point-in-time-query in the doc.

Posted by "ad1happy2go (via GitHub)" <gi...@apache.org>.
ad1happy2go commented on issue #8370:
URL: https://github.com/apache/hudi/issues/8370#issuecomment-1494248024

   @bithw1  If I am not wrong, time travel queries means how the table looked at that time. Incremental queries will give the data coming/commited between that time range.
   
   If we use beginTime as "000" then incremental query also should behave exact same as time travel query. 
   


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[GitHub] [hudi] bithw1 commented on issue #8370: [SUPPORT]What's the difference between time-travel-query and point-in-time-query in the doc.

Posted by "bithw1 (via GitHub)" <gi...@apache.org>.
bithw1 commented on issue #8370:
URL: https://github.com/apache/hudi/issues/8370#issuecomment-1495169282

   Thanks @ad1happy2go , we have the same understanding,thanks.


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