[firestore-bigquery-export] Support partitioned table base on Timestamp field

[alfred-risb]

Firestore have extension to export data into bigquery, the table is partitioned base on when the record success push to server (_partitiontime).

My project require to partition table base on specific field (Timestamp or int type) in document, it will be amazing if such feature available in "export to Bigquery" extension

[dackers86]

Thanks @alfred-risb.

This should be something that can be added. Moved to under-consideration.

[jasonberryman]

@i14h Can we also add support for the partition value to be derived from a ISO8601 datetime string and make the field a configurable parameter in the extension setup?

[darnmason]

another vote for ISO8601 formatted strings, if possible.

[dackers86]

For the issue of partitioning based on the timestamp, this should be currently working as expected.

The issue can re-opened if it is still as an issue.

For the ISO8601 formatted strings please track https://github.com/firebase/extensions/issues/1483