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Fix string comparison in jsonpath 

Take into account pg_server_to_any() may return input string "as is".

Reported-by: Andrew Dunstan, Thomas Munro
Discussion: https://postgr.es/m/0ed83a33-d900-466a-880a-70ef456c721f%402ndQuadrant.com
Author: Alexander Korotkov, Thomas Munro
Backpatch-through: 12
This commit is contained in:
Alexander Korotkov 2019-08-12 06:19:19 +03:00
parent b43f7c117e
commit 251c8e39bc
1 changed files with 29 additions and 8 deletions
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37
src/backend/utils/adt/jsonpath_exec.c
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@ -2020,16 +2020,37 @@ compareStrings(const char *mbstr1, int mblen1,
}
else
{
/* We have to convert other encodings to UTF-8 first, then compare. */
char *utf8str1 = pg_server_to_any(mbstr1, mblen1, PG_UTF8),
*utf8str2 = pg_server_to_any(mbstr2, mblen2, PG_UTF8);
int cmp;
char *utf8str1,
*utf8str2;
int cmp,
utf8len1,
utf8len2;
cmp = binaryCompareStrings(utf8str1, strlen(utf8str1),
utf8str2, strlen(utf8str2));
/*
* We have to convert other encodings to UTF-8 first, then compare.
* Input strings may be not null-terminated and pg_server_to_any() may
* return them "as is". So, use strlen() only if there is real
* conversion.
*/
utf8str1 = pg_server_to_any(mbstr1, mblen1, PG_UTF8);
utf8str2 = pg_server_to_any(mbstr2, mblen2, PG_UTF8);
utf8len1 = (mbstr1 == utf8str1) ? mblen1 : strlen(utf8str1);
utf8len2 = (mbstr2 == utf8str2) ? mblen2 : strlen(utf8str2);
pfree(utf8str1);
pfree(utf8str2);
cmp = binaryCompareStrings(utf8str1, utf8len1, utf8str2, utf8len2);
/*
* If pg_server_to_any() did no real conversion, then we actually
* compared original strings. So, we already done.
*/
if (mbstr1 == utf8str1 && mbstr2 == utf8str2)
return cmp;
/* Free memory if needed */
if (mbstr1 != utf8str1)
pfree(utf8str1);
if (mbstr2 != utf8str2)
pfree(utf8str2);
/*
* When all Unicode codepoints are equal, return result of binary