BigQueryIO.Read.Bound (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

java.lang.Object
- com.google.cloud.dataflow.sdk.transforms.PTransform<PInput,PCollection<TableRow>>
- - com.google.cloud.dataflow.sdk.io.BigQueryIO.Read.Bound

All Implemented Interfaces:

HasDisplayData, Serializable

Enclosing class:

BigQueryIO.Read
```
public static class BigQueryIO.Read.Bound
extends PTransform<PInput,PCollection<TableRow>>
```
A PTransform that reads from a BigQuery table and returns a bounded PCollection of TableRows.

See Also:

Serialized Form

Field Summary
- Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform
  name

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`PCollection<TableRow>`	`apply(PInput input)` Applies this `PTransform` on the given `InputT`, and returns its `Output`.
`BigQueryIO.Read.Bound`	`from(String tableSpec)` Returns a copy of this transform that reads from the specified table.
`BigQueryIO.Read.Bound`	`from(TableReference table)` Returns a copy of this transform that reads from the specified table.
`BigQueryIO.Read.Bound`	`from(ValueProvider<String> tableSpec)` Returns a copy of this transform that reads from the specified table.
`BigQueryIO.Read.Bound`	`fromQuery(String query)` Returns a copy of this transform that reads the results of the specified query.
`BigQueryIO.Read.Bound`	`fromQuery(ValueProvider<String> query)` Like `fromQuery(String)`, but from a `ValueProvider`.
`protected Coder<TableRow>`	`getDefaultOutputCoder()` Returns the default `Coder` to use for the output of this single-output `PTransform`.
`Boolean`	`getFlattenResults()` Returns true/false if result flattening is enabled/disabled, or null if not applicable.
`String`	`getQuery()` Returns the query to be read, or `null` if reading from a table instead.
`ValueProvider<String>`	`getQueryProvider()` Returns the query to be read, or `null` if reading from a table instead.
`TableReference`	`getTable()` Returns the table to read, or `null` if reading from a query instead.
`ValueProvider<TableReference>`	`getTableProvider()` Returns the table to read, or `null` if reading from a query instead.
`Boolean`	`getUseLegacySql()` Returns true (false) if the query will (will not) use BigQuery's legacy SQL mode, or null if not applicable.
`boolean`	`getValidate()` Returns true if table validation is enabled.
`BigQueryIO.Read.Bound`	`named(String name)` Returns a copy of this transform using the name associated with this transformation.
`void`	`populateDisplayData(DisplayData.Builder builder)` Register display data for the given transform or component.
`BigQueryIO.Read.Bound`	`usingStandardSql()` Enables BigQuery's Standard SQL dialect when reading from a query.
`void`	`validate(PInput input)` Called before invoking apply (which may be intercepted by the runner) to verify this transform is fully specified and applicable to the specified input.
`BigQueryIO.Read.Bound`	`withoutResultFlattening()` Disable flattening of query results.
`BigQueryIO.Read.Bound`	`withoutValidation()` Disable table validation.

Methods inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform
getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - named
```
public BigQueryIO.Read.Bound named(String name)
```
    Returns a copy of this transform using the name associated with this transformation.
    Does not modify this object.
  - from
```
public BigQueryIO.Read.Bound from(String tableSpec)
```
    Returns a copy of this transform that reads from the specified table. Refer to BigQueryIO.parseTableSpec(String) for the specification format.
    Does not modify this object.
  - from
```
public BigQueryIO.Read.Bound from(ValueProvider<String> tableSpec)
```
    Returns a copy of this transform that reads from the specified table. Refer to BigQueryIO.parseTableSpec(String) for the specification format.
    Does not modify this object.
  - from
```
public BigQueryIO.Read.Bound from(TableReference table)
```
    Returns a copy of this transform that reads from the specified table.
    Does not modify this object.
  - fromQuery
```
public BigQueryIO.Read.Bound fromQuery(String query)
```
    Returns a copy of this transform that reads the results of the specified query.
    Does not modify this object.
    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.Bound fromQuery(ValueProvider<String> query)
```
    Like fromQuery(String), but from a ValueProvider.
  - withoutValidation
```
public BigQueryIO.Read.Bound withoutValidation()
```
    Disable table validation.
  - withoutResultFlattening
```
public BigQueryIO.Read.Bound 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.Bound 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.
  - validate
```
public void validate(PInput input)
```
    Description copied from class: PTransform
    
    Called before invoking apply (which may be intercepted by the runner) to verify this transform is fully specified and applicable to the specified input.
    By default, does nothing.
    
    Overrides:
    
    validate in class PTransform<PInput,PCollection<TableRow>>
  - apply
```
public PCollection<TableRow> apply(PInput input)
```
    Description copied from class: PTransform
    
    Applies this PTransform on the given InputT, and returns its Output.
    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).
    The default implementation throws an exception. A derived class must either implement apply, or else each runner must supply a custom implementation via PipelineRunner.apply(com.google.cloud.dataflow.sdk.transforms.PTransform<InputT, OutputT>, InputT).
    
    Overrides:
    
    apply in class PTransform<PInput,PCollection<TableRow>>
  - getDefaultOutputCoder
```
protected Coder<TableRow> getDefaultOutputCoder()
```
    Description copied from class: PTransform
    
    Returns the default Coder to use for the output of this single-output PTransform.
    By default, always throws
    
    Overrides:
    
    getDefaultOutputCoder in class PTransform<PInput,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<PInput,PCollection<TableRow>>
    
    Parameters:
    
    builder - The builder to populate with display data.
    
    See Also:
    
    HasDisplayData
  - getTableProvider
```
@Nullable
public ValueProvider<TableReference> getTableProvider()
```
    Returns the table to read, or null if reading from a query instead.
  - getTable
```
@Nullable
public TableReference getTable()
```
    Returns the table to read, or null if reading from a query instead.
  - getQuery
```
@Nullable
public String getQuery()
```
    Returns the query to be read, or null if reading from a table instead.
  - getQueryProvider
```
@Nullable
public ValueProvider<String> getQueryProvider()
```
    Returns the query to be read, or null if reading from a table instead.
  - getValidate
```
public boolean getValidate()
```
    Returns true if table validation is enabled.
  - getFlattenResults
```
public Boolean getFlattenResults()
```
    Returns true/false if result flattening is enabled/disabled, or null if not applicable.
  - getUseLegacySql
```
@Nullable
public Boolean getUseLegacySql()
```
    Returns true (false) if the query will (will not) use BigQuery's legacy SQL mode, or null if not applicable.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2021-04-19 UTC.

BigQueryIO.Read.Bound (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Class BigQueryIO.Read.Bound

Field Summary

Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

Method Summary

Methods inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

Methods inherited from class java.lang.Object

Method Detail

named

from

from

from

fromQuery

fromQuery

withoutValidation

withoutResultFlattening

usingStandardSql

validate

apply

getDefaultOutputCoder

populateDisplayData

getTableProvider

getTable

getQuery

getQueryProvider

getValidate

getFlattenResults

getUseLegacySql