inspect: remove redundant join conditions #701
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The TABLE_SCHEMA and TABLE_NAME are already guaranteed to have the same value in COLUMNS and UNIQUES because of the WHEREs in each query. Dropping it from the ON clause makes it complete much faster. On (at least) MySQL 5.6 installs with thousands of tables, this query completes in a few seconds without the additional join conditions, but takes more than a minute with it.
shlomi-noach
changed the title
This was referenced Jan 28, 2019
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This is a resubmission of #699 by @twotwotwo, for internal purposes.