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

Commits on Mar 27, 2022

add LOAD DATA LOCAL INFILE to speed up data insert
slowtech
committed

Commits on Mar 29, 2022

specify csv separator
[email protected]
committed

Commits on Apr 1, 2022