i've been struggling with an issue and finally figured out the reason for it. with a

tap-google-sheets

source, i have had issues with columns just not appearing in the target. it turns out that

tap-google-sheets

 will sometimes issue schema defs like the following, and 

pipelinewise-target-snowflake

 doesn't know how to handle that:

"schema": {
   "properties": {
       "period_start_date": {"anyOf": [{"type": ["null", "string"], "format": "date"}
        ...
    }
}

my question is - is

anyof

valid singer spec? trying to understand whether this is an issue on the target side or tap side. https://github.com/transferwise/pipelinewise/issues/449#issuecomment-682120934