https://www.w3schools.com/PYTHON/ref_string_casefold.asp
Python String casefold() Method
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python stringmethod
https://www.mindspore.cn/docs/en/r1.10/api_python/dataset_text/mindspore.dataset.text.CaseFold.html
mindspore.dataset.text.CaseFold | MindSpore 1.10 documentation | MindSpore
mindsporedatasettextdocumentation
https://commitfest.postgresql.org/patch/6391/
Use CASEFOLD() internally rather than LOWER()
rather thanuseinternallylower