feat: support create index if not exist
statement
#15189
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difficulty/simple
Issues that relatively easy and friendly to newcomers.
help wanted
Issues that need help from contributors
type/feature
Milestone
Is your feature request related to a problem? Please describe.
It seems that since Postgresql 9.5, this statement is available:https://dba.stackexchange.com/questions/35616/create-index-if-it-does-not-exist
proposed by an existing customer
Describe the solution you'd like
No response
Describe alternatives you've considered
No response
Additional context
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