GitHub user sirpkt opened a pull request:
https://github.com/apache/tajo/pull/308
TAJO-920: Add FIRST_VALUE and LAST_VALUE window functions
I implemented first_value() and last_value() for TEXT type first.
- It adds first_value, last_value keyword in lexer and parser and modifies
SQLAnalyzer to call corresponding functions.
- first_value() is defined as window function, however, last_value() is
defined as aggregation function because it needs to reach the end row of the
given column to determine the last value.
- With current window function structure, every window function name should
be hardcoded in ExprAnnotator.java, so do it for first_value()
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sirpkt/tajo TAJO-920
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/308.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 #308
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commit d07fdb3ccdf4b929d8562a4fc3535f7a3df68280
Author: sirpkt <[email protected]>
Date: 2014-12-18T08:03:51Z
TAJO-920: Add FIRST_VALUE and LAST_VALUE window functions
commit 7464d62460bc7af2b268541c0be57d57d7e899ce
Author: sirpkt <[email protected]>
Date: 2014-12-18T09:16:26Z
TAJO-920: Add FIRST_VALUE and LAST_VALUE window functions
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