Vincent Tran has posted comments on this change. ( http://gerrit.cloudera.org:8080/7009 )
Change subject: IMPALA-5315: Cast to timestamp fails for YYYY-M-D format ...................................................................... Patch Set 5: Looks like the slow down is due to the 2x slower TotalReadThroughput from the SCAN node due to LAZY_CTX.Reset() being called for each value vs. called once for each DateTimeFormatContext in TimestampParser::Init() when the format string is stamped out. New path - TotalReadThroughput: 10.03 MB/sec Old path - TotalReadThroughput: 20.75 MB/sec Will look for alternatives. -- To view, visit http://gerrit.cloudera.org:8080/7009 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: Ib9a184a09d7e7783f04d47588537612c2ecec28f Gerrit-Change-Number: 7009 Gerrit-PatchSet: 5 Gerrit-Owner: Vincent Tran <vtt...@cloudera.com> Gerrit-Reviewer: Dan Hecht <dhe...@cloudera.com> Gerrit-Reviewer: Lars Volker <l...@cloudera.com> Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com> Gerrit-Reviewer: Vincent Tran <vtt...@cloudera.com> Gerrit-Comment-Date: Tue, 12 Dec 2017 02:20:59 +0000 Gerrit-HasComments: No