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fix: Precision loss on extremely large floating-point numbers #3093

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fix: Precision loss on extremely large floating-point numbers #3093

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a438e61
fix: Precision loss on extremely large floating-point numbers
SevInf Nov 6, 2023
89612f2
Merge branch 'master' into fix/max-int-precision
charmander Jun 25, 2024
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1 change: 1 addition & 0 deletions packages/pg-protocol/src/serializer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ const startup = (opts: Record<string, string>): Buffer => {
}

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.


var bodyBuffer = writer.addCString('').flush()
// this message is sent without a code
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2 changes: 1 addition & 1 deletion packages/pg/test/integration/client/type-coercion-tests.js
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Expand Up @@ -109,7 +109,7 @@ var types = [
},
{
name: 'double precision',
values: [-101.3, -1.2, 0, 1.2, 101.1, null],
values: [-101.3, -1.2, 0, 1.2, 101.1, Number.MAX_SAFE_INTEGER, null],
},
{
name: 'timestamptz',
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