Fix flaky BigQuery tests using snapshot tables

[hashhar]

Description

BigQuery has limits on how many snapshots or clones can exist for a single table. It seems BigQuery is miscounting though because we occasionally see errors like below on CI even though all snapshots get dropped by their respective tests:

Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 400 Bad Request
POST https://www.googleapis.com/bigquery/v2/projects/sep-bq-cicd/queries
{
  "code": 400,
  "errors": [
    {
      "domain": "global",
      "message": "Cannot have more than 1000 active clones and snapshots of a table. Please use a deep copy, or remove some active clones or snapshots.",
      "reason": "invalid"
    }
  ],
  "message": "Cannot have more than 1000 active clones and snapshots of a table. Please use a deep copy, or remove some active clones or snapshots.",
  "status": "INVALID_ARGUMENT"
}

A workaround is to use a different table as the source of the snapshot everytime which is what this change does.

Fixes #18266

Release notes

(x) This is not user-visible or docs only and no release notes are required.

[hashhar]

couldn't think of a cleaner alternative than parameterizing the "table definition" as well. Suggestions welcome.

[ebyhr]

How about split into several test methods? DataProvider is helpful for simple cases, but the new code is a little hard to read for me.

    @Test
    public void testEmptyProjectionTable()
    {
        testEmptyProjection(
                tableName -> onBigQuery("CREATE TABLE " + tableName + " AS SELECT * FROM tpch.region"),
                tableName -> onBigQuery("DROP TABLE " + tableName));
    }

... 

    @Test
    public void testEmptyProjectionSnapshot()
    {
        String regionCopy = TEST_SCHEMA + ".region_" + randomNameSuffix();
        testEmptyProjection(
                tableName -> {
                    // BigQuery has limits on how many snapshots/clones a single table can have and seems to miscount leading to failure when creating too many snapshots from single table
                    // For snapshot table test we use a different source table everytime
                    onBigQuery("CREATE TABLE " + regionCopy + " AS SELECT * FROM tpch.region");
                    onBigQuery("CREATE SNAPSHOT TABLE " + tableName + " CLONE " + regionCopy);
                },
                tableName -> {
                    onBigQuery("DROP SNAPSHOT TABLE " + tableName);
                    onBigQuery("DROP TABLE " + regionCopy);
                });
    }

    private void testEmptyProjection(Consumer<String> createTable, Consumer<String> dropTable)
    {
        // Regression test for https://github.com/trinodb/trino/issues/14981, https://github.com/trinodb/trino/issues/5635 and https://github.com/trinodb/trino/issues/6696
        String name = TEST_SCHEMA + ".test_empty_projection_" + randomNameSuffix();

        createTable.accept(name);
        try {
            assertQuery("SELECT count(*) FROM " + name, "VALUES 5");
            assertQuery("SELECT count(*) FROM " + name, "VALUES 5"); // repeated query to cover https://github.com/trinodb/trino/issues/6696
            assertQuery("SELECT count(*) FROM " + name + " WHERE regionkey = 1", "VALUES 1");
            assertQuery("SELECT count(name) FROM " + name + " WHERE regionkey = 1", "VALUES 1");
        }
        finally {
            dropTable.accept(name);
        }
    }

[hashhar]

Fair point.

[hashhar]

AC @ebyhr. PTAL again.