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Fix error in LIKE (found by SQLancer)

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This commit is contained in:
Alexey Milovidov 2021-04-25 03:58:44 +03:00
parent 601108fb1c
commit 263378bb20
3 changed files with 67 additions and 9 deletions
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21
src/Functions/likePatternToRegexp.h
View File

@ -36,18 +36,21 @@ inline String likePatternToRegexp(const String & pattern)
res += "."; res += ".";
break; break;
case '\\': case '\\':
++pos; /// Known escape sequences.
if (pos == end) if (pos + 1 != end && (pos[1] == '%' || pos[1] == '_'))
{
res += pos[1];
++pos;
}
else if (pos + 1 != end && pos[1] == '\\')
{
res += "\\\\"; res += "\\\\";
++pos;
}
else else
{ {
if (*pos == '%' || *pos == '_') /// Unknown escape sequence treated literally: as backslash and the following character.
res += *pos; res += "\\\\";
else
{
res += '\\';
res += *pos;
}
} }
break; break;
default: default:

25
tests/queries/0_stateless/01847_bad_like.reference Normal file
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30
tests/queries/0_stateless/01847_bad_like.sql Normal file
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@ -0,0 +1,30 @@
SELECT '\w' LIKE '%\w%';
SELECT '\w' LIKE '\w%';
SELECT '\w' LIKE '%\w';
SELECT '\w' LIKE '\w';
SELECT '\\w' LIKE '%\\w%';
SELECT '\\w' LIKE '\\w%';
SELECT '\\w' LIKE '%\\w';
SELECT '\\w' LIKE '\\w';
SELECT '\i' LIKE '%\i%';
SELECT '\i' LIKE '\i%';
SELECT '\i' LIKE '%\i';
SELECT '\i' LIKE '\i';
SELECT '\\i' LIKE '%\\i%';
SELECT '\\i' LIKE '\\i%';
SELECT '\\i' LIKE '%\\i';
SELECT '\\i' LIKE '\\i';
SELECT '\\' LIKE '%\\\\%';
SELECT '\\' LIKE '\\\\%';
SELECT '\\' LIKE '%\\\\';
SELECT '\\' LIKE '\\\\';
SELECT '\\' LIKE '\\';
SELECT '\\xyz\\' LIKE '\\\\%\\\\';
SELECT '\\xyz\\' LIKE '\\\\___\\\\';
SELECT '\\xyz\\' LIKE '\\\\_%_\\\\';
SELECT '\\xyz\\' LIKE '\\\\%_%\\\\';