Details : 
  - Issue was seen when ORDER BY clause is used. 
      
Issue:
  - For each table, size of position structure (m_pos) supposed to be the size of a record in that table. In this case, reason 
    for wrong result is the wrong size of position structure aka m_pos (ref length) used in statement_current table to 
    traverse through records.  
      
Fix:
 - Corrected the size of position structure, m_pos (ref length) in statement_current table so that it can correctly 
    traverse thorough all records.