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http://svn.apache.org/repos/asf/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/ColumnInfo.java <https://reviews.apache.org/r/15561/#comment56246> This import seems not being used. http://svn.apache.org/repos/asf/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/ColumnPrunerProcFactory.java <https://reviews.apache.org/r/15561/#comment56247> What is this fix for? - Xuefu Zhang On Nov. 17, 2013, 12:37 p.m., Ted Xu wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > https://reviews.apache.org/r/15561/ > ----------------------------------------------------------- > > (Updated Nov. 17, 2013, 12:37 p.m.) > > > Review request for hive. > > > Bugs: HIVE-5771 > https://issues.apache.org/jira/browse/HIVE-5771 > > > Repository: hive > > > Description > ------- > > Currently there is no constant folding/propagation optimizer, all expressions > are evaluated at runtime. > > HIVE-2470 did a great job on evaluating constants on UDF initializing phase, > however, it is still a runtime evaluation and it doesn't propagate constants > from a subquery to outside. > > It may reduce I/O and accelerate process if we introduce such an optimizer. > > > Diffs > ----- > > > http://svn.apache.org/repos/asf/hive/trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java > 1542644 > > http://svn.apache.org/repos/asf/hive/trunk/contrib/src/test/results/clientpositive/udf_example_add.q.out > 1542644 > > 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http://svn.apache.org/repos/asf/hive/trunk/ql/src/test/results/compiler/plan/udf_when.q.xml > 1542644 > > Diff: https://reviews.apache.org/r/15561/diff/ > > > Testing > ------- > > > Thanks, > > Ted Xu > >
