Commit 16c45930 authored by unknown's avatar unknown
Browse files

BUG 11104 (same as changeset 1.1891 on the 5.0 tree, but realised this 

needed to be fixed in earlier versions)
Fixed the iteration of how substrings are handled with negative indexes in 
SUBSTRING_INDEX


mysql-test/r/func_str.result:
  New results for the fix to substring_index
mysql-test/t/func_str.test:
  Added tests for fix to substring_index, various lenth search patterns. Also included
  are the queuries the user who reported the bug listed in the bug report
sql/item_strfunc.cc:
  Fix to BUG 11104 
      Took out the offset-=delimiter_length-1 out of the for loop. It was causing
      basically this: 
      select substring_index('the king of the the hill', 'the', -2) to not work.
      The first iteration, offset would be initialised to 24, then strstr would 
      point at 'the king of the the* hill' ('*'means right before the 
      character following), returning a offset of 16. The for loop would then 
      decrement offset by two (3 - 1), to 14, now pointing at 
      "the king of th*e the hill", _skipping_ past the 'e' in the second to last
      'the', and therefore strstr would never have a chance of matching the 
      second to last 'the', then moving on to the 'the' at the begginning of the 
      string!
  
      In a nutshell, offset was being decremented by too great a value, preventing
      the second to last 'the' from being ever found, hence the result of 
      'king of the the hill' from the query that is reported in the bug report
parent 90e41fac

mysql-test/r/func_str.result

+117 −0
Original line number Diff line number Diff line
@@ -38,6 +38,123 @@ www. .se 
select substring_index('.tcx.se','.',-2),substring_index('.tcx.se','.tcx',-1);

substring_index('.tcx.se','.',-2)	substring_index('.tcx.se','.tcx',-1)

tcx.se	.se

select substring_index('aaaaaaaaa1','a',1);

substring_index('aaaaaaaaa1','a',1)



select substring_index('aaaaaaaaa1','aa',1);

substring_index('aaaaaaaaa1','aa',1)



select substring_index('aaaaaaaaa1','aa',2);

substring_index('aaaaaaaaa1','aa',2)

aa

select substring_index('aaaaaaaaa1','aa',3);

substring_index('aaaaaaaaa1','aa',3)

aaaa

select substring_index('aaaaaaaaa1','aa',4);

substring_index('aaaaaaaaa1','aa',4)

aaaaaa

select substring_index('aaaaaaaaa1','aa',5);

substring_index('aaaaaaaaa1','aa',5)

aaaaaaaaa1

select substring_index('aaaaaaaaa1','aaa',1);

substring_index('aaaaaaaaa1','aaa',1)



select substring_index('aaaaaaaaa1','aaa',2);

substring_index('aaaaaaaaa1','aaa',2)

aaa

select substring_index('aaaaaaaaa1','aaa',3);

substring_index('aaaaaaaaa1','aaa',3)

aaaaaa

select substring_index('aaaaaaaaa1','aaa',4);

substring_index('aaaaaaaaa1','aaa',4)

aaaaaaaaa1

select substring_index('aaaaaaaaa1','aaaa',1);

substring_index('aaaaaaaaa1','aaaa',1)



select substring_index('aaaaaaaaa1','aaaa',2);

substring_index('aaaaaaaaa1','aaaa',2)

aaaa

select substring_index('aaaaaaaaa1','1',1);

substring_index('aaaaaaaaa1','1',1)

aaaaaaaaa

select substring_index('aaaaaaaaa1','a',-1);

substring_index('aaaaaaaaa1','a',-1)

1

select substring_index('aaaaaaaaa1','aa',-1);

substring_index('aaaaaaaaa1','aa',-1)

1

select substring_index('aaaaaaaaa1','aa',-2);

substring_index('aaaaaaaaa1','aa',-2)

aa1

select substring_index('aaaaaaaaa1','aa',-3);

substring_index('aaaaaaaaa1','aa',-3)

aaaa1

select substring_index('aaaaaaaaa1','aa',-4);

substring_index('aaaaaaaaa1','aa',-4)

aaaaaa1

select substring_index('aaaaaaaaa1','aa',-5);

substring_index('aaaaaaaaa1','aa',-5)

aaaaaaaaa1

select substring_index('aaaaaaaaa1','aaa',-1);

substring_index('aaaaaaaaa1','aaa',-1)

1

select substring_index('aaaaaaaaa1','aaa',-2);

substring_index('aaaaaaaaa1','aaa',-2)

aaa1

select substring_index('aaaaaaaaa1','aaa',-3);

substring_index('aaaaaaaaa1','aaa',-3)

aaaaaa1

select substring_index('aaaaaaaaa1','aaa',-4);

substring_index('aaaaaaaaa1','aaa',-4)



select substring_index('the king of thethe hill','the',-2);

substring_index('the king of thethe hill','the',-2)

the hill

select substring_index('the king of the the hill','the',-2);

substring_index('the king of the the hill','the',-2)

 the hill

select substring_index('the king of the  the hill','the',-2);

substring_index('the king of the  the hill','the',-2)

  the hill

select substring_index('the king of the  the hill',' the ',-1);

substring_index('the king of the  the hill',' the ',-1)

hill

select substring_index('the king of the  the hill',' the ',-2);

substring_index('the king of the  the hill',' the ',-2)

 the hill

select substring_index('the king of the  the hill',' ',-1);

substring_index('the king of the  the hill',' ',-1)

hill

select substring_index('the king of the  the hill',' ',-2);

substring_index('the king of the  the hill',' ',-2)

the hill

select substring_index('the king of the  the hill',' ',-3);

substring_index('the king of the  the hill',' ',-3)

 the hill

select substring_index('the king of the  the hill',' ',-4);

substring_index('the king of the  the hill',' ',-4)

the  the hill

select substring_index('the king of the  the hill',' ',-5);

substring_index('the king of the  the hill',' ',-5)

of the  the hill

select substring_index('the king of the.the hill','the',-2);

substring_index('the king of the.the hill','the',-2)

.the hill

select substring_index('the king of thethethe.the hill','the',-3);

substring_index('the king of thethethe.the hill','the',-3)

the.the hill

select substring_index('the king of thethethe.the hill','the',-1);

substring_index('the king of thethethe.the hill','the',-1)

 hill

select substring_index('the king of the the hill','the',1);

substring_index('the king of the the hill','the',1)



select substring_index('the king of the the hill','the',2);

substring_index('the king of the the hill','the',2)

the king of 

select substring_index('the king of the the hill','the',3);

substring_index('the king of the the hill','the',3)

the king of the 

select concat(':',ltrim('  left  '),':',rtrim('  right  '),':');

concat(':',ltrim('  left  '),':',rtrim('  right  '),':')

:left  :  right:

mysql-test/t/func_str.test

+39 −0
Original line number Diff line number Diff line
@@ -19,6 +19,45 @@ select concat('',left(right(concat('what ',concat('is ','happening')),9),4),'',s 
select substring_index('www.tcx.se','.',-2),substring_index('www.tcx.se','.',1);

select substring_index('www.tcx.se','tcx',1),substring_index('www.tcx.se','tcx',-1);

select substring_index('.tcx.se','.',-2),substring_index('.tcx.se','.tcx',-1);

select substring_index('aaaaaaaaa1','a',1);

select substring_index('aaaaaaaaa1','aa',1);

select substring_index('aaaaaaaaa1','aa',2);

select substring_index('aaaaaaaaa1','aa',3);

select substring_index('aaaaaaaaa1','aa',4);

select substring_index('aaaaaaaaa1','aa',5);

select substring_index('aaaaaaaaa1','aaa',1);

select substring_index('aaaaaaaaa1','aaa',2);

select substring_index('aaaaaaaaa1','aaa',3);

select substring_index('aaaaaaaaa1','aaa',4);

select substring_index('aaaaaaaaa1','aaaa',1);

select substring_index('aaaaaaaaa1','aaaa',2);

select substring_index('aaaaaaaaa1','1',1);

select substring_index('aaaaaaaaa1','a',-1);

select substring_index('aaaaaaaaa1','aa',-1);

select substring_index('aaaaaaaaa1','aa',-2);

select substring_index('aaaaaaaaa1','aa',-3);

select substring_index('aaaaaaaaa1','aa',-4);

select substring_index('aaaaaaaaa1','aa',-5);

select substring_index('aaaaaaaaa1','aaa',-1);

select substring_index('aaaaaaaaa1','aaa',-2);

select substring_index('aaaaaaaaa1','aaa',-3);

select substring_index('aaaaaaaaa1','aaa',-4);

select substring_index('the king of thethe hill','the',-2);

select substring_index('the king of the the hill','the',-2);

select substring_index('the king of the  the hill','the',-2);

select substring_index('the king of the  the hill',' the ',-1);

select substring_index('the king of the  the hill',' the ',-2);

select substring_index('the king of the  the hill',' ',-1);

select substring_index('the king of the  the hill',' ',-2);

select substring_index('the king of the  the hill',' ',-3);

select substring_index('the king of the  the hill',' ',-4);

select substring_index('the king of the  the hill',' ',-5);

select substring_index('the king of the.the hill','the',-2);

select substring_index('the king of thethethe.the hill','the',-3);

select substring_index('the king of thethethe.the hill','the',-1);

select substring_index('the king of the the hill','the',1);

select substring_index('the king of the the hill','the',2);

select substring_index('the king of the the hill','the',3);



select concat(':',ltrim('  left  '),':',rtrim('  right  '),':');

select concat(':',trim(LEADING FROM ' left'),':',trim(TRAILING FROM ' right '),':');

sql/item_strfunc.cc

+14 −2
Original line number Diff line number Diff line
@@ -1084,11 +1084,23 @@ String *Item_func_substr_index::val_str(String *str) 
      }

    }

    else

    {					// Start counting at end

      for (offset=res->length() ; ; offset-=delimeter_length-1)

    {

      /*

        Negative index, start counting at the end

      */

      for (offset=res->length(); offset ;)

      {

        /* 

          this call will result in finding the position pointing to one 

          address space less than where the found substring is located

          in res

        */

	if ((int) (offset=res->strrstr(*delimeter,offset)) < 0)

	  return res;			// Didn't find, return org string

        /*

          At this point, we've searched for the substring

          the number of times as supplied by the index value

        */

	if (!++count)

	{

	  offset+=delimeter_length;