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MDEV-33549: Incorrect handling of UPDATE in PS mode in case a table's…
… colum declared as NOT NULL UPDATE statement that is run in PS mode and uses positional parameter handles columns declared with the clause DEFAULT NULL incorrectly in case the clause DEFAULT is passed as actual value for the positional parameter of the prepared statement. Similar issue happens in case an expression specified in the DEFAULT clause of table's column definition. The reason for incorrect processing of columns declared as DEFAULT NULL is that setting of null flag for a field being updated was missed in implementation of the method Item_param::assign_default(). The reason for incorrect handling of an expression in DEFAULT clause is also missed saving of a field inside implementation of the method Item_param::assign_default().
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