cast double to decimal for postgres

[sandeepravi]

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

While pre-aggregating data from Aws Athena to postgres, there was an issue because Athena supports "double" whereas postgres does not.

Added a mapping to convert "double" fields to "decimal"

[paveltiunov]

@sandeepravi Hey Sandeep! Thanks for contributing this one! Do you think it should map to decimal or to double precision?

[sandeepravi]

yeah, I thought about this but I thought decimal should cover all cases as there's no limit on the storage.

But yeah, since postgres supports "double precision", it can be double precision as well.

[paveltiunov]

@sandeepravi Yep. Agree! Let's stick with decimal for now and see how it goes. Thanks for contributing this one!