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This bug appeared after the patch for bug 21390 that had added some code to handle outer joins with no matches after substitution of a const table in an efficient way. That code as it is cannot be applied to the case of nested outer join operations. Being applied to the queries with nested outer joins the code can cause crashes or wrong result sets. The fix blocks row substitution for const inner tables of an outer join if the inner operand is not a single table.
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