GitHub user selvaganesang opened a pull request:
https://github.com/apache/incubator-trafodion/pull/167
[TRAFODION-1575] Avoid transforming update into delete and insert
commands to improve performance of update statements. When a table has
check constraint the update command is transformed into insert and delete.
Added code to evaluate constraint expressions in all TCBs so that
constraint checking is done correctly. But, the subtask [TRAFODION-1610]
needs to implemented before this change is exercised.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/selvaganesang/incubator-trafodion workspace
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-trafodion/pull/167.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #167
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commit c69be87dde510728fafdbe9520df2602573e9522
Author: selvaganesang <[email protected]>
Date: 2015-11-10T17:16:46Z
[TRAFODION-1575] Avoid transforming update into delete and insert
commands to improve performance of update statements. When a table has
check constraint the update command is transformed into insert and delete.
Added code to evaluate constraint expressions in all TCBs so that
constraint checking is done correctly. But, the subtask [TRAFODION-1610]
needs to implemented before this change is exercised.
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