SUBSTRING_INDEX returns NULL when the number parameter is negative

Build tested: 1.1.4-1

Reference:

select cidx, CCHAR1, SUBSTRING_INDEX(CCHAR1,'a',-3) from datatypetestm order by cidx

cidx CCHAR1 SUBSTRING_INDEX(CCHAR1,'a',-3)
1 a a

ColumnStore

select cidx, CCHAR1, SUBSTRING_INDEX(CCHAR1,'a',-3) from datatypetestm order by cidx
cidx CCHAR1 SUBSTRING_INDEX(CCHAR1,'a',-3)
1 a NULL