MaxGekk opened a new pull request #28091: [WIP][SQL] Optimize fromJavaDate() and toJavaDate() URL: https://github.com/apache/spark/pull/28091 ### What changes were proposed in this pull request? ### Why are the changes needed? Before: ``` Save dates to ORC: Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative ------------------------------------------------------------------------------------------------------------------------ after 1582, noop 8410 8410 0 11.9 84.1 1.0X before 1582, noop 8408 8408 0 11.9 84.1 1.0X after 1582 15507 15507 0 6.4 155.1 0.5X before 1582 15099 15099 0 6.6 151.0 0.6X Load dates from ORC: Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative ------------------------------------------------------------------------------------------------------------------------ after 1582, vec off 26858 27479 727 3.7 268.6 1.0X ``` After: ``` Save dates to ORC: Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative ------------------------------------------------------------------------------------------------------------------------ after 1582, noop 7518 7518 0 13.3 75.2 1.0X before 1582, noop 7292 7292 0 13.7 72.9 1.0X after 1582 13286 13286 0 7.5 132.9 0.6X before 1582 16213 16213 0 6.2 162.1 0.5X Java HotSpot(TM) 64-Bit Server VM 1.8.0_231-b11 on Mac OS X 10.15.3 Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz Load dates from ORC: Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative ------------------------------------------------------------------------------------------------------------------------ after 1582, vec off 17867 17918 65 5.6 178.7 1.0X ``` ### Does this PR introduce any user-facing change? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If no, write 'No'. --> ### How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to add some test cases that check the changes thoroughly including negative and positive cases if possible. If it was tested in a way different from regular unit tests, please clarify how you tested step by step, ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future. If tests were not added, please describe why they were not added and/or why it was difficult to add. -->
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