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  1. 06 Jul, 2009 1 commit
    • V Narayanan's avatar
      Bug#45803 Inaccurate estimates for partial key values with IBMDB2I · 148141fa
      V Narayanan authored
      Some collations were causing IBMDB2I to report
      inaccurate key range estimations to the optimizer
      for LIKE clauses that select substrings. This can
      be seen by running EXPLAIN. This problem primarily
      affects multi-byte and unicode character sets.
      
      This patch involves substantial changes to several
      modules. There are a number of problems with the
      character set and collation handling. These problems
      have been or are being fixed,  and a comprehensive
      test has been included which should provide much
      better coverage than there was before. This test
      is enabled only for IBM i 6.1, because that version
      has support for the greatest number of collations.
      148141fa