🐛 [firestore-bigquery-export] Table not partitioned despite using default _PARTITIONTIME pseudo column

[ytetsuro]

[READ] Step 1: Are you in the right place?

Issues filed here should be about bugs for a specific extension in this repository.
If you have a general question, need help debugging, or fall into some
other category use one of these other channels:

• For general technical questions, post a question on StackOverflow
  with the firebase tag.
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• To file a bug against the Firebase Extensions platform, or for an issue affecting multiple extensions, please reach out to
  Firebase support directly.

[REQUIRED] Step 2: Describe your configuration

• Extension name: firestore-bigquery-export
• Extension version: 0.1.55
• Configuration values (redact info where appropriate):
  • BigQuery SQL table Time Partitioning option type: HOUR
  • BigQuery Time Partitioning column name: NONE
  • Firestore Document field name for BigQuery SQL Time Partitioning field option: NONE
  • BigQuery SQL Time Partitioning table schema field(column) type: omit

[REQUIRED] Step 3: Describe the problem

Steps to reproduce:

install the firestore extension with the above settings.
Maybe the following code is the problem.

https://github.com/firebase/extensions/blob/next/firestore-bigquery-export/firestore-bigquery-change-tracker/src/bigquery/partitioning.ts#L97

Expected result

An unpartitioned table is generated.

Actual result

A table with _PARTITIONTIME pseudo column is generated.

Because the BigQuery Time Partitioning column name has the following description

BigQuery table column/schema field name for TimePartitioning. You can choose schema available as timestamp OR a new custom defined column that will be assigned to the selected Firestore Document field below. Defaults to pseudo column _PARTITIONTIME if unspecified. Cannot be changed if Table is already partitioned.

[dan-massey]

I'm also seeing issues with partitioning not working.

If I install a new instance of the extension with the configuration:

• BigQuery SQL table Time Partitioning option type = DAY
• BigQuery Time Partitioning column name (Optional) = [EMPTY]
• Firestore Document field name for BigQuery SQL Time Partitioning field option (Optional) = [EMPTY]
• BigQuery SQL Time Partitioning table schema field(column) type (Optional) = [EMPTY]

I get a table generated that is partitioned by _PARTITIONTIME, but the value of _PARTITIONTIME is always NULL.

If I install I update the instance to create a new dataset with the configuration:

• BigQuery SQL table Time Partitioning option type = DAY
• BigQuery Time Partitioning column name (Optional) = partition_column
• Firestore Document field name for BigQuery SQL Time Partitioning field option (Optional) = [EMPTY]
• BigQuery SQL Time Partitioning table schema field(column) type (Optional) = [EMPTY]

A new table is created, but it isn't partitioned. The column partition_column is not created.

The documentation on configuring clustering through the extension is pretty confusing and would probably benefit from another revision.