fix(cubesql): Support to_timestamp(epoch) pg function, fix #8901

[droidraja]

Check List

• Tests has been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

Issue Reference this PR resolves
#8901

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[paveltiunov]

@droidraja Thanks for contributing! Could you please provide at least one test for it? Thanks!

[droidraja]

@droidraja Thanks for contributing! Could you please provide at least one test for it? Thanks!

@paveltiunov, This does not work for complex queries like to_timetamp(cast(epoch_varchar as numeric(10))) which is being issued by quicksight, will add a UDF to handle the same and push the changes with tests in some time

[droidraja]

@paveltiunov have added the udf and testcases, please go ahead with the review.

[igorlukanin]

@droidraja Could you also please update the docs here? https://cube.dev/docs/reference/sql-api#data-type-formatting-functions

[droidraja]

@igorlukanin This PR and the existing functionality supports evaluation of constant expression to cube time dimension filter and to_timestamp can't be applied to any columns. So it doesn't support both projection and post processing that is mentioned in the docs.

@paveltiunov please correct my understanding if there are any holes.