@Test public void testReadAllRecordsInDb() throws Exception { SpannerConfig spannerConfig = createSpannerConfig(); PCollectionView<Transaction> tx = p.apply( SpannerIO.createTransaction() .withSpannerConfig(spannerConfig) .withTimestampBound(TimestampBound.strong())); PCollection<Struct> allRecords = p.apply( SpannerIO.read() .withSpannerConfig(spannerConfig) .withBatching(false) .withQuery( "SELECT t.table_name FROM information_schema.tables AS t WHERE t" + ".table_catalog = '' AND t.table_schema = ''")) .apply( MapElements.into(TypeDescriptor.of(ReadOperation.class)) .via( (SerializableFunction<Struct, ReadOperation>) input -> { String tableName = input.getString(0); return ReadOperation.create().withQuery("SELECT * FROM " + tableName); })) .apply(SpannerIO.readAll().withTransaction(tx).withSpannerConfig(spannerConfig)); PAssert.thatSingleton(allRecords.apply("Count rows", Count.globally())).isEqualTo(5L); p.run(); }