Fix of MDEV-3874: Server crashes in Item_field::print on a SELECT from a MERGE...
Fix of MDEV-3874: Server crashes in Item_field::print on a SELECT from a MERGE view with materialization+semijoin, subquery, ORDER BY. The problem was that in debugging binaries it try to print item to assign human readable name to the item. But subquery item was already freed (join_free/cleanup with full cleanup) so Item_field refers to temporary table which memory had been already freed.
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