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[IMPALA-7655] Codegen output for conditional functions (if,isnull, coalesce) is very suboptimal - Impala - [issue]
... provided a clue that an aggregation involving an if() function was very slow, 10x slower than the equivalent version using a case:[localhost:21000] def...    Author: Tim Armstrong , 2018-10-18, 23:17
[IMPALA-5200] Profile timers not updated during long-running sort - Impala - [issue]
...If you have a query plan with a long-running sort operation (e.g. minutes), the profile timers are not updated to reflect the time spent in the sort until the sort starts returning rows.E.g....    Author: Tim Armstrong , 2018-10-18, 22:00
[IMPALA-6924] Compute stats profiles should include reference to child queries - Impala - [issue]
..."Compute stats" queries spawn off child queries that do most of the work. It's non-trivial to track down the child queries and get their profiles if something goes wrong. We really should ha...    Author: Tim Armstrong , 2018-10-18, 21:56
[IMPALA-6964] Track stats about column and page sizes in Parquet reader - Impala - [issue]
...It would be good to have stats for scanned parquet data about page sizes. We currently can't tell much about the "shape" of the parquet pages from the profile. Some questions that are intere...    Author: Tim Armstrong , 2018-10-18, 21:56
[IMPALA-6977] Report CPU usage (user/sys) per fragment - Impala - [issue]
...The exec summary only shows wallclock time, because that is the only time reported per operator.Operator       #Hosts  Avg Time  Max Time  #Rows  Est. #Row...    Author: Tim Armstrong , 2018-10-18, 21:52
[IMPALA-7164] Define public API for RuntimeProfile - Impala - [issue]
...Currently the only public API for the runtime profile is the Thrift definition. The exact layout and counters are all implementation-dependent and subject to change. People are trying to bui...    Author: Tim Armstrong , 2018-10-18, 21:50
[IMPALA-7637] Include more hash table stats in profile - Impala - [issue]
...Our hash table collects some useful stats about collisions and travel length, but then we don't do anything to expose them:    Author: Tim Armstrong , 2018-10-18, 21:46
[IMPALA-6140] Unexplained gap between "All backends started" and "Rows available" - Impala - [issue]
...In the query timeline below there is a significant delay before rows are available.     Query Timeline      Query submitted: 305.17us (305173)      Pl...    Author: Tim Armstrong , 2018-10-18, 21:42
[IMPALA-7545] Add admission control status to query log - Impala - [issue]
...We already include the query progress in the HS2 GetLog() response (although for some reason we don't do the same for beeswax) so we should include admission control progress. We should defi...    Author: Tim Armstrong , 2018-10-17, 17:32
[IMPALA-7471] Impala crashes or returns incorrect results when querying parquet nested types - Impala - [issue]
...From found a case where Impala return...    Author: Tim Armstrong , 2018-10-15, 18:22