PERF: vectorize PeriodIndex.from_fields#65921
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Add period_ordinals_from_fields Cython function that converts arrays of year/month/day/hour/minute/second fields to period ordinals in a single C-level loop, replacing the Python-space list-append loop in _range_from_fields, and vectorize the quarter-to-calendar-month conversion with numpy ops. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Split out of GH-65195 (which also vectorized
to_datetime(DataFrame)); this PR is just thePeriodIndex.from_fieldshalf, with the more involvedto_datetimeassembly path to follow in a separate PR.Adds a
period_ordinals_from_fieldsCython function that converts arrays of date/time fields to period ordinals in a single C-level loop, replacing the Python-space list-append loop in_range_from_fields, and vectorizes the quarter-to-calendar-month conversion with numpy ops. Fields that would overflow theint32npy_datetimestructslots raiseOverflowError, matchingperiod_ordinalonmain.PeriodIndex.from_fields(2k monthly)PeriodIndex.from_fields(100k monthly)Test plan
pandas/tests/indexes/period/andpandas/tests/arrays/period/passpandas/tests/scalar/period/andpandas/tests/tslibs/passQ-DEC, all-6-field hourly periods, empty arrays, and field values outsideint32range raising🤖 Generated with Claude Code