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dbms: allowed to parse unix timestamp as DateTime for small unix timestamps [#METR-15790].

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This commit is contained in:
Alexey Milovidov 2015-10-21 22:04:02 +03:00
parent fbe7b48dc9
commit 7fcae3dddd
4 changed files with 20 additions and 11 deletions
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2
dbms/include/DB/IO/ReadHelpers.h
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@ -427,7 +427,7 @@ void readDateTimeTextFallback(time_t & datetime, ReadBuffer & buf);
inline void readDateTimeText(time_t & datetime, ReadBuffer & buf)
{
/** Считываем 10 символов, которые могут быть unix timestamp.
* При этом, поддерживается только unix timestamp из 10 символов - от 9 сентября 2001.
* При этом, поддерживается только unix timestamp из 5-10 символов.
* Потом смотрим на пятый символ. Если это число - парсим unix timestamp.
* Если это не число - парсим YYYY-MM-DD hh:mm:ss.
*/

27
dbms/src/IO/ReadHelpers.cpp
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@ -265,21 +265,28 @@ void readBackQuotedString(String & s, ReadBuffer & buf)
void readDateTimeTextFallback(time_t & datetime, ReadBuffer & buf)
{
char s[19];
static constexpr auto DATE_TIME_BROKEN_DOWN_LENGTH = 19;
static constexpr auto UNIX_TIMESTAMP_MAX_LENGTH = 10;
size_t size = buf.read(s, 10);
if (10 != size)
char s[DATE_TIME_BROKEN_DOWN_LENGTH];
char * s_pos = s;
/// Кусок, похожий на unix timestamp.
while (s_pos < s + UNIX_TIMESTAMP_MAX_LENGTH && !buf.eof() && *buf.position() >= '0' && *buf.position() <= '9')
{
s[size] = 0;
throw Exception(std::string("Cannot parse datetime ") + s, ErrorCodes::CANNOT_PARSE_DATETIME);
*s_pos = *buf.position();
++s_pos;
++buf.position();
}
if (s[4] < '0' || s[4] > '9')
/// 2015-01-01 01:02:03
if (s_pos == s + 4 && !buf.eof() && (*buf.position() < '0' || *buf.position() > '9'))
{
size_t size = buf.read(&s[10], 9);
if (9 != size)
const size_t remaining_size = DATE_TIME_BROKEN_DOWN_LENGTH - (s_pos - s);
size_t size = buf.read(s_pos, remaining_size);
if (remaining_size != size)
{
s[10 + size] = 0;
s_pos[size] = 0;
throw Exception(std::string("Cannot parse datetime ") + s, ErrorCodes::CANNOT_PARSE_DATETIME);
}
@ -297,7 +304,7 @@ void readDateTimeTextFallback(time_t & datetime, ReadBuffer & buf)
datetime = DateLUT::instance().makeDateTime(year, month, day, hour, minute, second);
}
else
datetime = parse<time_t>(s, 10);
datetime = parse<time_t>(s, s_pos - s);
}

1
dbms/tests/queries/0_stateless/00142_parse_timestamp_as_datetime.reference
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@ -1 +1,2 @@
1
1

1
dbms/tests/queries/0_stateless/00142_parse_timestamp_as_datetime.sql
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@ -1 +1,2 @@
SELECT min(ts = toUInt32(toDateTime(toString(ts)))) FROM (SELECT 1000000000 + 1234 * number AS ts FROM system.numbers LIMIT 1000000);
SELECT min(ts = toUInt32(toDateTime(toString(ts)))) FROM (SELECT 10000 + 1234 * number AS ts FROM system.numbers LIMIT 1000000);