Tim Armstrong has uploaded a new change for review. http://gerrit.cloudera.org:8080/7081
Change subject: IMPALA-5347: reduce codegen overhead of timestamp trunc() ...................................................................... IMPALA-5347: reduce codegen overhead of timestamp trunc() Trunc has many implementations that are switched between based on a string argument. Before this patch all implementations were compiled for every call to trunc(), which added a lot of unnecessary codegen time. This patch avoids the problem by moving the implementation out of the cross-compiled code. Testing: Ran expr-test. I ran the repro query from IMPALA-5347 and verified that codegen time was significantly reduced from ~1.4s to ~.35s. Perf: I ran the following targeted benchmark: set num_nodes=1; set num_scanner_threads=1; select count(*) from lineitem where trunc(l_shipdate, 'yy') >= '1998-01-01' The end-to-end query latency was reduced to 0.52s from 0.72s on average. The time spent in the scanner increased slightly from around 390ms to around 410ms. This seems like a good-tradeoff. Change-Id: I222258f51b2093a38929df847fdb5d25bb9aafc3 --- M be/src/exprs/CMakeLists.txt M be/src/exprs/udf-builtins-ir.cc A be/src/exprs/udf-builtins.cc M be/src/exprs/udf-builtins.h 4 files changed, 275 insertions(+), 227 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/81/7081/1 -- To view, visit http://gerrit.cloudera.org:8080/7081 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newchange Gerrit-Change-Id: I222258f51b2093a38929df847fdb5d25bb9aafc3 Gerrit-PatchSet: 1 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: Tim Armstrong <tarmstr...@cloudera.com>
