BUG: can't mutate and then drop #1299
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closes #1296
The issue is that
_maybe_resolve_exprswas not ignoring columns that don't exist in a childSelectionso it would try to resolve them and throw anIbisTypeError. This is okay, because the expressions have already been resolved in theProjectorconstructor so trying to project a column that doesn't anywhere would raise this exception long before getting to_maybe_resolve_exprs.