PERF: regression fixup for timestamp.TimestampConstruction.time_parse_iso8601_tz benchmark

[anmyachev]

• closes #N/A
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff

For detection details see: #26220 (comment)

The slowdown was due to the use of convert_to_tsobject function.

Asv result:

master	patch	ratio	test_name
31.3±0.5μs	21.9±0.2μs	0.70	timestamp.TimestampConstruction.time_parse_iso8601_tz

[codecov]

Codecov Report

Merging #26334 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26334      +/-   ##
==========================================
- Coverage   92.04%   92.03%   -0.01%     
==========================================
  Files         175      175              
  Lines       52297    52297              
==========================================
- Hits        48137    48134       -3     
- Misses       4160     4163       +3

Flag	Coverage Δ
#multiple	90.59% <ø> (ø)	⬆️
#single	40.74% <ø> (-0.13%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.01% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

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[codecov]

Codecov Report

Merging #26334 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26334      +/-   ##
==========================================
- Coverage   92.04%   92.03%   -0.01%     
==========================================
  Files         175      175              
  Lines       52292    52292              
==========================================
- Hits        48132    48129       -3     
- Misses       4160     4163       +3

Flag	Coverage Δ
#multiple	90.59% <ø> (ø)	⬆️
#single	40.73% <ø> (-0.13%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.01% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[gfyoung]

@anmyachev : Nice! Can you show the result of the entire benchmark suite?

[anmyachev]

@gfyoung
asv continuous -f 1.05 master HEAD -b ^timeseries -b ^timestamp -a warmup_time=1 -a sample_time=1:

master	patch	ratio	test_name
30.9±0.6μs	22.1±0.4μs	0.72	timestamp.TimestampConstruction.time_parse_iso8601_tz

[gfyoung]

@anmyachev : I meant the entire benchmark suite, just in case.

[jreback]

this looks fine; waiting on CI resolution.

[anmyachev]

@gfyoung entire benchmark suite will be later.

[jreback]

thanks @anmyachev