Replace aliasing for joins with more general character #1787
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Instead of doing
<table>.<column> AS '<table>.<column>'for aliases (which is weird, but accepted by MySQL), this replaces it to use underscore (<table>.<column> AS <table>_<column>) to be a less "problematic" character for use without extra quotes and be less dependent on MySQL (e.g. because it then requires specific quoting with a dot in the alias).