Sergey Vojtovich 0865e3deab MDEV-7792 - SQL Parsing Error - UNION AND ORDER BY WITH JOIN ...

ORDER BY against union may confuse name resolution context, causing valid
SQL statements to fail.

The purpose of context change was presumably intended for the duration of
gathering field list for ORDER BY. However it isn't actually required (name
resolution context is never accessed by the latter).

See also alternative solution (in MySQL 5.7): 92145b95.

2015-06-29 11:04:55 +04:00

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