andygrove / sqlparser-rs / 411

92%

master: 92%

Pull #130

travis-ci

Don't lose precision when parsing decimal fractions

The SQL standard requires that numeric literals with a decimal point,
like 1.23, are represented exactly, up to some precision. That means
that parsing these literals into f64s is invalid, as it is impossible
to represent many decimal numbers exactly in binary floating point (for
example, 0.3).

This commit instead parses these literals into a big decimal type that
is capable of representing every decimal fraction exactly. Downstream
consumers can lower this representation into something more efficient
but less precise (like the old f64) if desired.

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