fix: Precision loss on extremely large floating-point numbers #3093
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Sets `extra_float_digits` setting to 1 when connecting to DB. For older (<12) Postgres, this should be enough to cover all values JS can store preciesely. For 12+ postgres this setting should have no effect. Fix brianc#3092
charmander
requested changes
Jun 25, 2024
| @@ -26,6 +26,7 @@ const startup = (opts: Record<string, string>): Buffer => { | |||
| } | |||
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| writer.addCString('client_encoding').addCString('UTF8') | |||
| writer.addCString('extra_float_digits').addCString('1') | |||
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I think this belongs in pg’s use of startup instead of in pg-protocol. (Side benefit: fewer/no other tests to update, since that’s at least part of why CI is failing right now.)
It also needs to be higher than 1 (take 0.42467013940651843 as a random example), with an accordingly stricter test case. I don’t have time right now to figure out exactly how much precision is enough, but setting it to 3 (https://www.postgresql.org/docs/11/runtime-config-client.html#GUC-EXTRA-FLOAT-DIGITS) is probably fine.
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Sets
extra_float_digitssetting to 1 when connecting to DB. For older(<12) Postgres, this should be enough to cover all values JS can store
preciesely. For 12+ postgres this setting should have no effect.
Fix #3092