Google BigQuery Storage v1 API - Class ReadSession.Types.TableReadOptions (3.7.0) 

public sealed class ReadSession.Types.TableReadOptions : IMessage<ReadSession.Types.TableReadOptions>, IEquatable<ReadSession.Types.TableReadOptions>, IDeepCloneable<ReadSession.Types.TableReadOptions>, IBufferMessage, IMessage

Reference documentation and code samples for the Google BigQuery Storage v1 API class ReadSession.Types.TableReadOptions.

Options dictating how we read a table.

Inheritance

object > ReadSession.Types.TableReadOptions

Namespace

Google.Cloud.BigQuery.Storage.V1

Assembly

Google.Cloud.BigQuery.Storage.V1.dll

Constructors

TableReadOptions()

public TableReadOptions()

TableReadOptions(TableReadOptions)

public TableReadOptions(ReadSession.Types.TableReadOptions other)
Parameter
NameDescription
otherReadSessionTypesTableReadOptions

Properties

ArrowSerializationOptions

public ArrowSerializationOptions ArrowSerializationOptions { get; set; }

Optional. Options specific to the Apache Arrow output format.

Property Value
TypeDescription
ArrowSerializationOptions

AvroSerializationOptions

public AvroSerializationOptions AvroSerializationOptions { get; set; }

Optional. Options specific to the Apache Avro output format

Property Value
TypeDescription
AvroSerializationOptions

HasSamplePercentage

public bool HasSamplePercentage { get; }

Gets whether the "sample_percentage" field is set

Property Value
TypeDescription
bool

OutputFormatSerializationOptionsCase

public ReadSession.Types.TableReadOptions.OutputFormatSerializationOptionsOneofCase OutputFormatSerializationOptionsCase { get; }
Property Value
TypeDescription
ReadSessionTypesTableReadOptionsOutputFormatSerializationOptionsOneofCase

RowRestriction

public string RowRestriction { get; set; }

SQL text filtering statement, similar to a WHERE clause in a query. Aggregates are not supported.

Examples: "int_field > 5" "date_field = CAST('2014-9-27' as DATE)" "nullable_field is not NULL" "st_equals(geo_field, st_geofromtext("POINT(2, 2)"))" "numeric_field BETWEEN 1.0 AND 5.0"

Restricted to a maximum length for 1 MB.

Property Value
TypeDescription
string

SamplePercentage

public double SamplePercentage { get; set; }

Optional. Specifies a table sampling percentage. Specifically, the query planner will use TABLESAMPLE SYSTEM (sample_percentage PERCENT). This samples at the file-level. It will randomly choose for each file whether to include that file in the sample returned. Note, that if the table only has one file, then TABLESAMPLE SYSTEM will select that file and return all returnable rows contained within.

Property Value
TypeDescription
double

SelectedFields

public RepeatedField<string> SelectedFields { get; }

Optional. The names of the fields in the table to be returned. If no field names are specified, then all fields in the table are returned.

Nested fields -- the child elements of a STRUCT field -- can be selected individually using their fully-qualified names, and will be returned as record fields containing only the selected nested fields. If a STRUCT field is specified in the selected fields list, all of the child elements will be returned.

As an example, consider a table with the following schema:

{ "name": "struct_field", "type": "RECORD", "mode": "NULLABLE", "fields": [ { "name": "string_field1", "type": "STRING", . "mode": "NULLABLE" }, { "name": "string_field2", "type": "STRING", "mode": "NULLABLE" } ] }

Specifying "struct_field" in the selected fields list will result in a read session schema with the following logical structure:

struct_field { string_field1 string_field2 }

Specifying "struct_field.string_field1" in the selected fields list will result in a read session schema with the following logical structure:

struct_field { string_field1 }

The order of the fields in the read session schema is derived from the table schema and does not correspond to the order in which the fields are specified in this list.

Property Value
TypeDescription
RepeatedFieldstring