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31dd4824d3
Fixed bug where the :meth:`.Table.tometadata` method would not properly accommodate :class:`.Index` objects that didn't consist of simple column expressions, such as indexes against a :func:`.text` construct, indexes that used SQL expressions or :attr:`.func`, etc. The routine now copies expressions fully to a new :class:`.Index` object while substituting all table-bound :class:`.Column` objects for those of the target table. Also refined the means by which tometadata() checks if an Index or UniqueConstraint is generated by a column-level flag, by propagating an attribute "_column_flag=True" to such indexes/constraints. Change-Id: I7ef1b8ea42f9933357ae35f241a5ba9838bac35b Fixes: #4147