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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. |
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