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Move the guts of our Levenshtein implementation into core.

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The hope is that we can use this to produce better diagnostics in
some cases.

Peter Geoghegan, reviewed by Michael Paquier, with some further
changes by me.
This commit is contained in:
Robert Haas
2014-11-13 12:25:10 -05:00
parent 1d69ae419d
commit c0828b78e9
6 changed files with 118 additions and 79 deletions
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22
src/backend/utils/adt/varlena.c
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@ -1546,7 +1546,6 @@ varstr_cmp(char *arg1, int len1, char *arg2, int len2, Oid collid)
return result;
}
/* text_cmp()
* Internal comparison function for text strings.
* Returns -1, 0 or 1
@ -4747,3 +4746,24 @@ text_format_nv(PG_FUNCTION_ARGS)
{
return text_format(fcinfo);
}
/*
* Helper function for Levenshtein distance functions. Faster than memcmp(),
* for this use case.
*/
static inline bool
rest_of_char_same(const char *s1, const char *s2, int len)
{
while (len > 0)
{
len--;
if (s1[len] != s2[len])
return false;
}
return true;
}
/* Expand each Levenshtein distance variant */
#include "levenshtein.c"
#define LEVENSHTEIN_LESS_EQUAL
#include "levenshtein.c"