Handle select * case in columnar batch read from Spark #263
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This PR fixes the failure that happens with select * queries when columnar batch read is enabled. Without this fix, TPC-DS queries including 72, 21,.. will fail.
This can be reproed with SELECT * and spark-bigquery-with-dependencies jar released after PR : #237 (which enabled arrow format in V2)
Test : added 1 integration test case