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34 lines
881 B
Markdown
34 lines
881 B
Markdown
# PostgreSQL ASCII folding
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Reasonably fast (tested on Musicbrainz dataset, is 40% faster than a simple `UPPER()`)
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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
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*Example:*
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```
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postgres=# SELECT asciifold('Hello, ⒩ᴐⱤú⒴⁈～!');
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asciifold
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----------------------
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Hello, (n)ORu(y)?!~!
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(1 row)
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postgres=# SELECT asciifold_lower('Hello, ⒩ᴐⱤú⒴⁈～!');
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asciifold
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----------------------
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hello, (n)oru(y)?!~!
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(1 row)
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```
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UTF8 input string is not sanitized (invalid UTF8 might lead to undefined behavior)
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### Compiling from source (CMake)
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```bash
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apt install postgresql-server-11-dev
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cmake .
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make
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```
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See [asciifolding.c](asciifolding.c) & [build.sh](build.sh) for more information
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