Test: Use BigQuery Read API for reading external BigLake tables #24452
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The storage APIs support reading BigLake external tables (ie external tables with a connection). But the current implementation uses views which can be expensive, because it requires a query. This PR adds support to read BigLake tables directly using the storage API. There are no behavior changes for external tables and BQ native tables - they use the view and storage APIs respectively. Added a new test for BigLake tables. Co-authored-by: Marcin Rusek <[email protected]>
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#22974