csv-parser optimization ~-7.5%
#1553
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First check ascii, if that fails we continue from where ascii fails with utf8 checking
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First check ascii, if that fails we continue
from where ascii fails with utf8 checking
This makes up for perf lost in #1551, but only if string data is ascii. If most of the first part of the column is ascii, its likely also faster.
Ideally this optimization goes upstream in arrow2.
FYI @jorgecarleitao