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--echo subqueries within outer joins go into ON expr.
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# TODO: psergey: check if case conversions like those are ok (it broke on windows)
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# TODO: psergey: check if case conversions like those are ok (it broke on windows)
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#--echo t2 should be wrapped into OJ-nest, so we have "t1 LJ (t2 J t10)"
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#--echo we shouldn't flatten if we're going to get a join of > MAX_TABLES.