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Problem: ======= InnoDB persistent statistics doesn't take innodb_stats_method variable while calculating n_diff_pfx for the n-prefix index columns. Solution: ========= While calculating the persistent statistics, InnoDB consider all NULLS as different value when innodb_stats_method is set to NULLS_UNEQUAL or NULLS_IGNORED. InnoDB statistics depends on the value of "innodb_stats_method" variable when the statistics were last recalculated. dict_stats_analyze_index_level(), dict_stats_scan_page(), dict_stats_analyze_index_below_cur(), dict_stats_analyze_index_for_n_prefix(): All function accepts the parameter to indicate the innodb_stats_method. It also calculates the number of non-null key value for each level or leaf page dict_stats_index_set_n_diff(): calculates the number of non-null values similar to number of different key values. Append the non-default innodb_stats_method variable name for n_diff_pfx statistics description in mysql.innodb_index_stats. IndexScanStatistics: Structure to store the various statistical metric gathered during index scan fetch operation. This structure is being used in dict_stats_analyze_index_level() to fetch the statistics |
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| data | ||
| dict | ||
| eval | ||
| fil | ||
| fsp | ||
| fts | ||
| fut | ||
| gis | ||
| ha | ||
| handler | ||
| ibuf | ||
| include | ||
| lock | ||
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| mem | ||
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| mysql-test/storage_engine | ||
| os | ||
| page | ||
| pars | ||
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| read | ||
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| row | ||
| srv | ||
| sync | ||
| trx | ||
| unittest | ||
| ut | ||
| .clang-format-old | ||
| CMakeLists.txt | ||
| COPYING.Google | ||
| COPYING.Percona | ||