Package org.apache.beam.sdk.io.gcp.bigquery

Class BigQueryIO.Read

java.lang.Object
org.apache.beam.sdk.transforms.PTransform<PBegin,PCollection<TableRow>>
org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Read
All Implemented Interfaces:
Serializable, HasDisplayData
Enclosing class:
BigQueryIO
public static class BigQueryIO.Read extends PTransform<PBegin,PCollection<TableRow>>
Implementation of BigQueryIO.read().
See Also:

  • Method Details

    • expand

      public PCollection<TableRow> expand(PBegin input)
      Description copied from class: PTransform
      Override this method to specify how this PTransform should be expanded on the given InputT.

      NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

      Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

      Specified by:
      expand in class PTransform<PBegin,PCollection<TableRow>>

    • populateDisplayData

      public void populateDisplayData(DisplayData.Builder builder)
      Description copied from class: PTransform
      Register display data for the given transform or component.

      populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

      By default, does not register any display data. Implementors may override this method to provide their own display data.

      Specified by:
      populateDisplayData in interface HasDisplayData
      Overrides:
      populateDisplayData in class PTransform<PBegin,PCollection<TableRow>>
      Parameters:
      builder - The builder to populate with display data.
      See Also:

    • withTestServices

      public BigQueryIO.Read withTestServices(BigQueryServices testServices)

    • getTableProvider

      public @Nullable ValueProvider<TableReference> getTableProvider()
      Returns the table to read, or null if reading from a query instead.

    • getTable

      public @Nullable TableReference getTable()
      Returns the table to read, or null if reading from a query instead.

    • from

      public BigQueryIO.Read from(String tableSpec)
      Reads a BigQuery table specified as "[project_id]:[dataset_id].[table_id]" or "[dataset_id].[table_id]" for tables within the current project.

    • from

      public BigQueryIO.Read from(ValueProvider<String> tableSpec)
      Same as from(String), but with a ValueProvider.

    • from

      public BigQueryIO.Read from(TableReference table)
      Read from table specified by a TableReference.

    • fromQuery

      public BigQueryIO.Read fromQuery(String query)
      Reads results received after executing the given query.

      By default, the query results will be flattened -- see "flattenResults" in the Jobs documentation for more information. To disable flattening, use withoutResultFlattening().

      By default, the query will use BigQuery's legacy SQL dialect. To use the BigQuery Standard SQL dialect, use usingStandardSql().

    • fromQuery

      public BigQueryIO.Read fromQuery(ValueProvider<String> query)
      Same as fromQuery(String), but with a ValueProvider.

    • withoutValidation

      public BigQueryIO.Read withoutValidation()
      Disable validation that the table exists or the query succeeds prior to pipeline submission. Basic validation (such as ensuring that a query or table is specified) still occurs.

    • withoutResultFlattening

      public BigQueryIO.Read withoutResultFlattening()
      Disable flattening of query results.

      Only valid when a query is used (fromQuery(java.lang.String)). Setting this option when reading from a table will cause an error during validation.

    • usingStandardSql

      public BigQueryIO.Read usingStandardSql()
      Enables BigQuery's Standard SQL dialect when reading from a query.

      Only valid when a query is used (fromQuery(java.lang.String)). Setting this option when reading from a table will cause an error during validation.

    • withTemplateCompatibility

      public BigQueryIO.Read withTemplateCompatibility()
      Use new template-compatible source implementation.

      Use new template-compatible source implementation. This implementation is compatible with repeated template invocations. It does not support dynamic work rebalancing.