BigQuery client throws NullPointerException when estimatedFields is empty

[lgajowy]

Environment details

• OS: linux /macos
• Java version: 8
• google-cloud-java version(s): ???

Steps to reproduce

1. Run the following code:

BigQueryOptions options = BigQueryOptions.newBuilder().build();
BigQuery client = options.getService();

TableId tableId = TableId.of(projectId, dataset, tableName);

// no options - all table fields are fetched
client.getTable(tableId);

Stacktrace

Exception in thread "main"
java.lang.NullPointerException
at com.google.cloud.bigquery.StandardTableDefinition$StreamingBuffer.fromPb(StandardTableDefinition.java:116)
at com.google.cloud.bigquery.StandardTableDefinition.fromPb(StandardTableDefinition.java:225)
at com.google.cloud.bigquery.TableDefinition.fromPb(TableDefinition.java:155)
at com.google.cloud.bigquery.TableInfo$BuilderImpl.<init>(TableInfo.java:183)
at com.google.cloud.bigquery.Table.fromPb(Table.java:593)
at com.google.cloud.bigquery.BigQueryImpl.getTable(BigQueryImpl.java:410)
at org.apache.beam.sdk.testutils.publishing.BigQueryClient.createTableIfNotExists(BigQueryClient.java:74)
at org.apache.beam.sdk.nexmark.Main.savePerfsToBigQuery(Main.java:184)
at org.apache.beam.sdk.nexmark.Main.runAll(Main.java:148)
at org.apache.beam.sdk.nexmark.Main.runAll(Main.java:98)
at org.apache.beam.sdk.nexmark.Main.main(Main.java:423)

Any additional information below

This happens only if table.streamingBuffer.estimatedFields field is null in table. This is not allways the case but when it is null the exception appears.

See more info here: https://issues.apache.org/jira/browse/BEAM-6076

Thanks!

[lgajowy]

Thanks for fixing this! :)