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percona-toolkit/t/pt-table-checksum/samples/char-chunk-ascii-explain.txt
2011-06-24 16:02:05 -06:00

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test ascii SELECT /*test.ascii:1/8*/ 0 AS chunk_num, COUNT(*) AS cnt, COALESCE(LOWER(CONV(BIT_XOR(CAST(CRC32(CONCAT_WS('#', `i`, `c`)) AS UNSIGNED)), 10, 16)), 0) AS crc FROM `test`.`ascii` FORCE INDEX (`c`) WHERE (`c` < ')')
test ascii `c` < ')'
test ascii `c` >= ')' AND `c` < '1'
test ascii `c` >= '1' AND `c` < '9'
test ascii `c` >= '9' AND `c` < 'A'
test ascii `c` >= 'A' AND `c` < 'I'
test ascii `c` >= 'I' AND `c` < 'Q'
test ascii `c` >= 'Q' AND `c` < 'Y'
test ascii `c` >= 'Y'