SQL Server to Postgres Migration

[labkey-martyp]

Rationale

Two functions were added as part of the SQL Server to Postgres migration.

1. timestampdiff2: This is a work around for the parameter swapping issue in the PG JDBC timestampdiff function. This implementation does not use the pass through JDBC timestampdiff function. This may be a temporary function depending on PG JDBC group fixing the underlying issue with parameter swapping.
2. age_in_days: This is to preserve the timestampdiff(SQL_TSI_DAY_0, param1, param2) SQL Server behavior. By default timestampdiff with frequency of days/months/years on SQL Server will count calendar boundaries. On Postgres, timestampdiff counts actual time between parameters, so a day is 24 hours. This will be a permanent addition to LabKey SQL.

Related Pull Requests

• https://github.com/LabKey/premiumModules/pull/499
• https://github.com/LabKey/tnprcEHRModules/pull/277

Changes

• timestampdiff2 function added with tests
• age_in_days method added and SQL_TSI_DAY added as option in age() method