Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22494
why do we care about breaking operations when turning off a behavior change
config? The config is prepared for this case: if a user hit a problem of the
new behavior, he can use this config to restore to the previous behavior.
If your argument is, picking a precise precision for literal is an
individual featue and not related to #20023, I'm OK to create a new config for
it.
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