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Posted to codereview@trafodion.apache.org by GitBox <gi...@apache.org> on 2019/03/04 22:35:15 UTC

[GitHub] [trafodion] DaveBirdsall opened a new pull request #1809: [TRAFODION-3282] Fix buffer overrun in ExHdfsScanTcb::work

DaveBirdsall opened a new pull request #1809: [TRAFODION-3282] Fix buffer overrun in ExHdfsScanTcb::work
URL: https://github.com/apache/trafodion/pull/1809
 
 
   There are two changes in this pull request:
   
   1. Fix a buffer overrun in ExHdfsScanTcb::work, which happens when we process a Hive row longer than we expect and that row spans read buffers. Now we will raise an 8457 error in this case.
   
   2. A workaround to avoid error 8457 is to use CQD HIVE_MAX_STRING_LENGTH_IN_BYTES 'nnnn', setting nnnn to the length of the longest string in the Hive table. There was a bug in UPDATE STATISTICS ... CREATE SAMPLE where this particular CQD was not passed down to the appropriate tdm_arkcmp, defeating the workaround. This bug has been fixed.

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