Add unit tests for sql helper functions

[Shaddoll]

What changed?
Add unit tests for sql helper functions

Why?
Improve test coverage

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018e0ac9-44c4-4e33-a66e-1fda34a34063

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 133 unchanged lines in 21 files lost coverage.
• Overall coverage decreased (-0.05%) to 62.9%

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Files with Coverage Reduction	New Missed Lines	%
common/membership/hashring.go	2	82.23%
common/peerprovider/ringpopprovider/config.go	2	81.58%
common/persistence/executionManager.go	2	78.59%
common/persistence/sql/sqlplugin/mysql/db.go	2	83.33%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
common/task/fifo_task_scheduler.go	2	82.47%
service/history/task/transfer_standby_task_executor.go	2	87.01%
service/matching/db.go	2	73.23%
common/log/tag/tags.go	3	50.18%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	3	61.93%

Totals
Change from base Build 018e0aa0-f4cd-4828-ae2b-dcfbdcc1af74:	-0.05%
Covered Lines:	92975
Relevant Lines:	147813

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💛 - Coveralls