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This change adds a new query option "timezone" which defines the timezone used for utc<->local conversions. The main goal is to simplify testing, but I think that some users may also find it useful so it is added as a "general" query option. Examples: set timezone=UTC; set timezone="Europe/Budapest" The timezones are validated, but as query options are not sent to the coordinator immediately, the error checking will only happen when running a query. Leading/trailing " and 'characters are stripped because the / character cannot be entered unquoted in some contexts. Currently the timezone has effect in the following cases: -function now() -conversions between unix time and timestamp if flag use_local_tz_for_unix_timestamp_conversions is true -reading parquet timestamps written by Hive if flag convert_legacy_hive_parquet_utc_timestamps is true In the near future Parquet timestamps's isAdjustedToUTC property will be supported, which will decide whether to do utc->local conversion on a per file+column basis. This conversion will be also affected. Testing: - Extended test_local_tz_conversion.py to actually test utc<->local conversion. Until now the effect of flag use_local_tz_for_unix_timestamp_conversions was practically untested. - Added a shell test to check that the default of the query option is the system's timezone. - Added a shell test to check timezone validation. Change-Id: I73de86eff096e1c581d3b56a0d9330d686f77272 Reviewed-on: http://gerrit.cloudera.org:8080/11064 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
62 lines
1.3 KiB
Plaintext
62 lines
1.3 KiB
Plaintext
# This test should be run with -use_local_tz_for_unix_timestamp_conversions=true
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====
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---- QUERY
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SET timezone=CET;
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SELECT
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from_unixtime(0),
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from_unixtime((40 * 365) * 24 * 60 * 60),
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from_unixtime((180 + 40 * 365) * 24 * 60 * 60);
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---- TYPES
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STRING,STRING,STRING
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---- RESULTS
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'1970-01-01 01:00:00','2009-12-22 01:00:00','2010-06-20 02:00:00'
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====
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---- QUERY
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set timezone="America/Los_Angeles";
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SELECT
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from_unixtime(0),
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from_unixtime((40 * 365) * 24 * 60 * 60),
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from_unixtime((180 + 40 * 365) * 24 * 60 * 60);
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---- TYPES
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STRING,STRING,STRING
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---- RESULTS
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'1969-12-31 16:00:00','2009-12-21 16:00:00','2010-06-19 17:00:00'
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====
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---- QUERY
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SET timezone=CET;
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SELECT
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unix_timestamp('1970-01-01 01:00:00'),
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unix_timestamp('2009-12-22 01:00:00'),
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unix_timestamp('2010-06-20 02:00:00');
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---- TYPES
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BIGINT,BIGINT,BIGINT
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---- RESULTS
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0,1261440000,1276992000
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====
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---- QUERY
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set timezone="America/Los_Angeles";
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SELECT
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unix_timestamp('1969-12-31 16:00:00'),
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unix_timestamp('2009-12-21 16:00:00'),
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unix_timestamp('2010-06-19 17:00:00');
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---- TYPES
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BIGINT,BIGINT,BIGINT
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---- RESULTS
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0,1261440000,1276992000
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====
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---- QUERY
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SET timezone=CET;
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select cast(0 as timestamp);
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---- TYPES
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TIMESTAMP
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---- RESULTS
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1970-01-01 01:00:00
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====
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---- QUERY
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SET timezone="America/Los_Angeles";
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select cast(0 as timestamp);
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---- TYPES
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TIMESTAMP
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---- RESULTS
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1969-12-31 16:00:00
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