test(regress): re-generate expected output using default DateStyle and IntervalStyle

[xiangjinwu]

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What's changed and what's your intention?

PostgreSQL supports multiple DateStyle and IntervalStyle:

Style Specification	Description	Example
ISO (default)	ISO 8601, SQL standard	1997-12-17 07:37:16-08
SQL	traditional style	12/17/1997 07:37:16.00 PST
Postgres (test)	original style	Wed Dec 17 07:37:16 1997 PST
German	regional style	17.12.1997 07:37:16.00 PS

Style Specification	Year-Month Interval	Day-Time Interval	Mixed Interval
sql_standard	1-2	3 4:05:06	-1-2 +3 -4:05:06
postgres (default)	1 year 2 mons	3 days 04:05:06	-1 year -2 mons +3 days -04:05:06
postgres_verbose (test)	@ 1 year 2 mons	@ 3 days 4 hours 5 mins 6 secs	@ 1 year 2 mons -3 days 4 hours 5 mins 6 secs ago
iso_8601	P1Y2M	P3DT4H5M6S	P-1Y-2M3D​T-4H-5M-6S

However, the regress test expectations are generated for DateStyle=Postgres, MDY and IntervalStyle=postgres_verbose.

risingwave/src/tests/regress/src/env.rs

Lines 34 to 45 in 0a6638c

	// Set timezone and datestyle for datetime-related tests
	set_var("PGTZ", "PST8PDT");
	set_var("PGDATESTYLE", "Postgres, MDY");
	// Likewise set intervalstyle to ensure consistent results. This is a bit
	// more painful because we must use PGOPTIONS, and we want to preserve the
	// user's ability to set other variables through that.
	{
	let mut pg_opts = var(VAR_PG_OPTS).unwrap_or_else(|_| "".to_string());
	pg_opts.push_str(" -c intervalstyle=postgres_verbose");
	set_var(VAR_PG_OPTS, pg_opts);
	}

We do not intend to support all these styles soon. So this PR regenerates the expected output to test the default style. The styles are set explicitly in tests and do not rely on environment variable or config files.

The tests in interval.sql always set styles explicitly and do not rely on environment, so there is no need to re-generate.

Note that we have supported setting timezone so expected output relating to timezone are not regenerated in our default timezone.

Checklist For Contributors

• All checks passed in ./risedev check (or alias, ./risedev c)

Documentation

• My PR DOES NOT contain user-facing changes.

[codecov]

Codecov Report

Merging #8386 (38a4f39) into main (03c49d9) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #8386      +/-   ##
==========================================
- Coverage   71.52%   71.52%   -0.01%     
==========================================
  Files        1133     1133              
  Lines      184417   184417              
==========================================
- Hits       131911   131903       -8     
- Misses      52506    52514       +8     

Flag	Coverage Δ
rust	71.52% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/batch/src/task/task_execution.rs	51.25% <0.00%> (-0.50%)	⬇️
...frontend/src/scheduler/hummock_snapshot_manager.rs	60.00% <0.00%> (-0.48%)	⬇️
src/object_store/src/object/mem.rs	86.87% <0.00%> (-0.39%)	⬇️
src/storage/src/hummock/compactor/iterator.rs	96.40% <0.00%> (-0.28%)	⬇️
src/storage/src/hummock/sstable_store.rs	64.77% <0.00%> (-0.16%)	⬇️
src/common/src/cache.rs	97.15% <0.00%> (-0.11%)	⬇️
src/stream/src/executor/aggregation/minput.rs	96.25% <0.00%> (-0.11%)	⬇️

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