Is it possible to add support for the assignment operator in mysql
backend, as in postgresql_statement_backend::prepare():
// Check whether this is an assignment(e.g. x:=y)
// and treat it as a special case, not as a named binding
else if ((next_it != end) && (*next_it == '='))
{
query_ += ":=";
++it;
}
Cause expressions like these:
UPDATE t1 SET c1 = 2 WHERE c1 = @var1 := 1;
performed with an error.
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