Mihaly Szjatinya 22723d0f27 IMPALA-7086: Cache timezone in *_utc_timestamp() ...

Added Prepare - Close routine around from/to_utc standard functions.
This gives a consistent time improvement for constant timezones.

Given sample table with 600M timestamp rows, on all-default
environment the query below gives a stable 2-3 seconds improvement.
SELECT count(*) FROM a_table
where from_utc_timestamp(ts, "a_timezone") > "a_date";

Averaged results for Release, SET MT_OP=1, SET DISABLE_CODEGEN=TRUE:
from_utc: 16,53s -> 12,53s
to_utc: 14,02 - > 11,53

Change-Id: Icdf5ff82c5d0554333aef1bc3bba034a4cf48230
Reviewed-on: http://gerrit.cloudera.org:8080/21735
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

2024-09-06 18:08:26 +00:00

..

.gitignore

- Move thrift out of FE src and into impala/common

2011-12-30 19:35:20 -08:00

CMakeLists.txt

IMPALA-11745: Add Hive's ESRI geospatial functions as builtins

2023-02-07 20:18:47 +00:00

gen_builtins_catalog.py

IMPALA-9627: Update utility scripts for Python 3 (part 2)

2023-04-26 18:52:23 +00:00

gen_geospatial_udf_wrappers.py

IMPALA-9627: Update utility scripts for Python 3 (part 2)

2023-04-26 18:52:23 +00:00

impala_functions.py

IMPALA-7086: Cache timezone in *_utc_timestamp()

2024-09-06 18:08:26 +00:00