Re: pgsql: Adjust string comparison in jsonpath

On 8/11/19 4:10 PM, Alexander Korotkov wrote:
> Adjust string comparison in jsonpath
>
> We have implemented jsonpath string comparison using default database locale.
> However, standard requires us to compare Unicode codepoints.  This commit
> implements that, but for performance reasons we still use per-byte comparison
> for "==" operator.  Thus, for consistency other comparison operators do per-byte
> comparison if Unicode codepoints appear to be equal.
>
> In some edge cases, when same Unicode codepoints have different binary
> representations in database encoding, we diverge standard to achieve better
> performance of "==" operator.  In future to implement strict standard
> conformance, we can do normalization of input JSON strings.
>


This appears to have upset prion when testing on en_US.iso885915.


cheers


andrew





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Andrew Dunstan                https://www.2ndQuadrant.com
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