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MDEV-16930 Crash when VALUES in derived table contains expressions
This patch always provides columns of the temporary table used for materialization of a table value constructor with some names. Before this patch these names were always borrowed from the items of the first row of the table value constructor. When this row contained expressions and expressions were not named then it could cause different kinds of problems. In particular if the TVC is used as the specification of a derived table this could cause a crash. The names given to the expressions used in a TVC are the same as those given to the columns of the result set from the corresponding SELECT.
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