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simon987 2020-06-07 13:11:27 -04:00
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# PostgreSQL ASCII folding
Reasonably fast ASCII folding functions (based on [Lucene asciifolding filter](https://lucene.apache.org/core/4_0_0/analyzers-common/org/apache/lucene/analysis/miscellaneous/ASCIIFoldingFilter.html)) for PostgreSQL
Reasonably fast (tested on Musicbrainz dataset, is 40% faster than a simple `UPPER()`)
ASCII folding functions based on [Lucene's ASCIIFoldingFilter](https://lucene.apache.org/core/4_0_0/analyzers-common/org/apache/lucene/analysis/miscellaneous/ASCIIFoldingFilter.html) for PostgreSQL
*Example:*
```
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----------------------
Hello, (n)ORu(y)?!~!
(1 row)
postgres=# SELECT asciifold_lower('Hello, ⒩ᴐⱤú⒴⁈～!');
asciifold
----------------------
hello, (n)oru(y)?!~!
(1 row)
```
UTF8 input string is not sanitized (invalid UTF8 might lead to undefined behavior)