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Merge Facebook commit 154c579b828a60722a7d9477fc61868c07453d08 and e8f0052f9b112dc786bf9b957ed5b16a5749f7fd authored by Steaphan Greene from https://github.com/facebook/mysql-5.6 Optimize prefix index queries to skip cluster index lookup when possible. Currently InnoDB will always fetch the clustered index (primary key index) for all prefix columns in an index, even when the value of a particular record is smaller than the prefix length. This change optimizes that case to use the record from the secondary index and avoid the extra lookup. Also adds two status vars that track how effective this is: innodb_secondary_index_triggered_cluster_reads: Times secondary index lookup triggered cluster lookup. innodb_secondary_index_triggered_cluster_reads_avoided: Times prefix optimization avoided triggering cluster lookup. |
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