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unknown authored
const tables. This resulted in choosing extremely inefficient execution plans in same cases when distribution of data in joined were skewed (see the customer test case for the bug). mysql-test/r/select.result: Added a test case for bug #21390: wrong estimate of rows after elimination of const tables. Includded a test case that checks the code added by the patch that handles outer joins with no matches after substitution of a const table in an efficient way. mysql-test/t/select.test: Added a test case for bug #21390: wrong estimate of rows after elimination of const tables. Included a test case that checks the code added by the patch that handles outer joins with no matches after substitution of a const table in an efficient way. sql/sql_select.cc: Fixed bug #21390: wrong estimate of rows after elimination of const tables. This resulted in choosing extremely inefficient execution plans in same cases when distribution of data in joined were skewed (see the customer test case for the bug). Also added the code to handle outer joins with no matches after substitution of a const table in an efficient way. Corrected calculation of the null rejecting key conditions.
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