Fix column alias with identifer for TableFactor::Derived

[ding-young]

Issue

fix #1060

[coveralls]

Pull Request Test Coverage Report for Build 4391517722

• 30 of 32 (93.75%) changed or added relevant lines in 2 files are covered.
• 27 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.05%) to 98.785%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/executor/fetch.rs	8	10	80.0%

Files with Coverage Reduction	New Missed Lines	%
core/src/ast/mod.rs	1	99.8%
core/src/executor/aggregate/mod.rs	26	86.6%

Totals
Change from base Build 4391237963:	-0.05%
Covered Lines:	40585
Relevant Lines:	41084

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💛 - Coveralls

[panarch]

This looks the best one we can choose for now. looks all good! Thanks a lot 👍