add LOAD DATA LOCAL INFILE to speed up data insert#450

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slowtech wants to merge 4 commits intoakopytov:masterfrom slowtech:feature-load-data

+70-10

Commits on Mar 27, 2022

add LOAD DATA LOCAL INFILE to speed up data insert
slowtech
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Commits on Mar 29, 2022

specify csv separator
ivictor@foxmail.com
committed

Commits on Apr 1, 2022

Modify the type of use_local_infile
ivictor@foxmail.com
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remove print(query)
ivictor@foxmail.com
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