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crashes MySQL 5.122 There was a difference in how UNIONs are handled on top level and when in sub-query. Because the rules for sub-queries were syntactically allowing cases that are not currently supported by the server we had crashes (this bug) or wrong results (bug 32051). Fixed by making the syntax rules for UNIONs match the ones at top level. These rules however do not support nesting UNIONs, e.g. (SELECT a FROM t1 UNION ALL SELECT b FROM t2) UNION (SELECT c FROM t3 UNION ALL SELECT d FROM t4) Supports for statements with nested UNIONs will be added in a future version. mysql-test/r/subselect.result: Bug #32036: test case mysql-test/t/subselect.test: Bug #32036: test case sql/sql_yacc.yy: Bug #32036: Make the syntax rules for UNIONs in subqueries the same as for top level UNIONs.
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