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Pass in the argument "label_length=<value>" to create_engine() to adjust how many characters max will be present in dynamically generated column labels, i.e. "somecolumn AS somelabel". Any value less than 6 will result in a label of minimal size, consiting of an underscore and a numeric counter. The compiler uses the value of dialect.max_identifier_length as a default. [ticket:1211] - removed ANON_NAME regular expression, using string patterns now - _generated_label() unicode subclass is used to indicate generated names which are subject to truncation