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fix lpad/rpad miss trailing zero #9610

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merged 6 commits into from
Nov 18, 2024
Merged

fix lpad/rpad miss trailing zero #9610

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9de2e01
fix lpad/rpad trailing zero miss
guo-shaoge Nov 13, 2024
081dc30
fix
guo-shaoge Nov 13, 2024
2380749
fix
guo-shaoge Nov 13, 2024
8322b96
fix
guo-shaoge Nov 14, 2024
b213371
refine
guo-shaoge Nov 14, 2024
67af62d
Merge branch 'master' into fix_pad_traling_zero
ti-chi-bot[bot] Nov 18, 2024
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19 changes: 11 additions & 8 deletions dbms/src/Functions/FunctionsString.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3622,6 +3622,13 @@ class TidbPadImpl
}
}

static void addTrailingZero(ColumnString::Chars_t & res, ColumnString::Offset & res_offset)
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{
res.resize(res.size() + 1);
res[res_offset] = '\0';
++res_offset;
}

// Do padding for one row.
// data_size/padding_size includes the tailing '\0'.
// Return true if result is null.
Expand All @@ -3640,6 +3647,7 @@ class TidbPadImpl

if (target_len < 0 || (data_len < static_cast<ColumnString::Offset>(target_len) && pad_len == 0))
{
addTrailingZero(res, res_offset);
return true;
}

Expand Down Expand Up @@ -3691,10 +3699,7 @@ class TidbPadImpl
++left;
}
}
// Add trailing zero.
res.resize(res.size() + 1);
res[res_offset] = '\0';
res_offset++;
addTrailingZero(res, res_offset);
return false;
}

Expand All @@ -3714,6 +3719,7 @@ class TidbPadImpl

if (target_len < 0 || (data_len < static_cast<ColumnString::Offset>(target_len) && pad_len == 0))
{
addTrailingZero(res, res_offset);
return true;
}

Expand Down Expand Up @@ -3766,10 +3772,7 @@ class TidbPadImpl
copyResult(res, res_offset, data, 0, tmp_target_len);
res_offset += tmp_target_len;
}
// Add trailing zero.
res.resize(res.size() + 1);
res[res_offset] = '\0';
res_offset++;
addTrailingZero(res, res_offset);
return false;
}

Expand Down
24 changes: 24 additions & 0 deletions tests/fullstack-test/expr/pad.test
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Expand Up @@ -111,3 +111,27 @@ mysql> set tidb_isolation_read_engines='tiflash'; set tidb_enforce_mpp=1; select

mysql> set tidb_isolation_read_engines='tiflash'; set tidb_enforce_mpp=1; SELECT max(lpad('y',0,c1)) FROM test.t2
max(lpad('y',0,c1))


mysql> drop table if exists test.t1
mysql> create table test.t1(c1 varchar(100), c2 int)
mysql> alter table test.t1 set tiflash replica 1
mysql> insert into test.t1 values('a', -1)
func> wait_table test t1

# crc32 will call ColumnString::getDataAt(i), which assume all string rows ends with '\0'.
mysql> select crc32(lpad(c1, c2, 'b')) from test.t1
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+--------------------------+
| crc32(lpad(c1, c2, 'b')) |
+--------------------------+
| NULL |
+--------------------------+

mysql> select crc32(rpad(c1, c2, 'b')) from test.t1
+--------------------------+
| crc32(rpad(c1, c2, 'b')) |
+--------------------------+
| NULL |
+--------------------------+

mysql> drop table if exists test.t1