com.gpudb.protocol

Class AggregateUniqueRequest

java.lang.Object

com.gpudb.protocol.AggregateUniqueRequest

All Implemented Interfaces:

org.apache.avro.generic.GenericContainer, org.apache.avro.generic.IndexedRecord

public class AggregateUniqueRequest
extends Object
implements org.apache.avro.generic.IndexedRecord

A set of parameters for GPUdb.aggregateUniqueRaw(AggregateUniqueRequest).

Returns all the unique values from a particular column (specified by columnName) of a particular table or view (specified by tableName). If columnName is a numeric column the values will be in binaryEncodedResponse. Otherwise if columnName is a string column the values will be in jsonEncodedResponse. The results can be paged via the offset and limit parameters.

Columns marked as store-only are unable to be used with this function.

To get the first 10 unique values sorted in descending order options would be::

{"limit":"10","sort_order":"descending"}.

The response is returned as a dynamic schema. For details see: dynamic schemas documentation.

If a result_table name is specified in the options, the results are stored in a new table with that name--no results are returned in the response. Both the table name and resulting column name must adhere to standard naming conventions; any column expression will need to be aliased. If the source table's shard key is used as the columnName, the result table will be sharded, in all other cases it will be replicated. Sorting will properly function only if the result table is replicated or if there is only one processing node and should not be relied upon in other cases. Not available if the value of columnName is an unrestricted-length string.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AggregateUniqueRequest.Encoding Specifies the encoding for returned records.
static class	AggregateUniqueRequest.Options Optional parameters.

Constructor Summary

Constructors

Constructor and Description
AggregateUniqueRequest() Constructs an AggregateUniqueRequest object with default parameters.
AggregateUniqueRequest(String tableName, String columnName, long offset, long limit, Map<String,String> options) Constructs an AggregateUniqueRequest object with the specified parameters.
AggregateUniqueRequest(String tableName, String columnName, long offset, long limit, String encoding, Map<String,String> options) Constructs an AggregateUniqueRequest object with the specified parameters.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
Object	get(int index) This method supports the Avro framework and is not intended to be called directly by the user.
static org.apache.avro.Schema	getClassSchema() This method supports the Avro framework and is not intended to be called directly by the user.
String	getColumnName()
String	getEncoding()
long	getLimit()
long	getOffset()
Map<String,String>	getOptions()
org.apache.avro.Schema	getSchema() This method supports the Avro framework and is not intended to be called directly by the user.
String	getTableName()
int	hashCode()
void	put(int index, Object value) This method supports the Avro framework and is not intended to be called directly by the user.
AggregateUniqueRequest	setColumnName(String columnName)
AggregateUniqueRequest	setEncoding(String encoding)
AggregateUniqueRequest	setLimit(long limit)
AggregateUniqueRequest	setOffset(long offset)
AggregateUniqueRequest	setOptions(Map<String,String> options)
AggregateUniqueRequest	setTableName(String tableName)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

AggregateUniqueRequest

public AggregateUniqueRequest()

Constructs an AggregateUniqueRequest object with default parameters.

AggregateUniqueRequest

public AggregateUniqueRequest(String tableName,
                              String columnName,
                              long offset,
                              long limit,
                              Map<String,String> options)

Constructs an AggregateUniqueRequest object with the specified parameters.

Parameters:

tableName - Name of an existing table or view on which the operation will be performed.

columnName - Name of the column or an expression containing one or more column names on which the unique function would be applied.

offset - A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The default value is 0.The minimum allowed value is 0. The maximum allowed value is MAX_INT.

limit - A positive integer indicating the maximum number of results to be returned. Or END_OF_SET (-9999) to indicate that the max number of results should be returned. The number of records returned will never exceed the server's own limit, defined by the max_get_records_size parameter in the server configuration. Use hasMoreRecords to see if more records exist in the result to be fetched, and offset & limit to request subsequent pages of results. The default value is -9999.

options - Optional parameters.

• COLLECTION_NAME: Name of a collection which is to contain the table specified in result_table. If the collection provided is non-existent, the collection will be automatically created. If empty, then the table will be a top-level table.
• EXPRESSION: Optional filter expression to apply to the table.
• SORT_ORDER: String indicating how the returned values should be sorted. Supported values:
  • ASCENDING
  • DESCENDING
  The default value is ASCENDING.
• RESULT_TABLE: The name of the table used to store the results. If present, no results are returned in the response. Has the same naming restrictions as tables. Not available if columnName is an unrestricted-length string.
• RESULT_TABLE_PERSIST: If true, then the result table specified in result_table will be persisted and will not expire unless a ttl is specified. If false, then the result table will be an in-memory table and will expire unless a ttl is specified otherwise. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• RESULT_TABLE_FORCE_REPLICATED: Force the result table to be replicated (ignores any sharding). Must be used in combination with the result_table option. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• RESULT_TABLE_GENERATE_PK: If true then set a primary key for the result table. Must be used in combination with the result_table option. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• TTL: Sets the TTL of the table specified in result_table.
• CHUNK_SIZE: Indicates the number of records per chunk to be used for the result table. Must be used in combination with the result_table option.
• VIEW_ID: ID of view of which the result table will be a member. The default value is ''.

The default value is an empty Map.

AggregateUniqueRequest

public AggregateUniqueRequest(String tableName,
                              String columnName,
                              long offset,
                              long limit,
                              String encoding,
                              Map<String,String> options)

Constructs an AggregateUniqueRequest object with the specified parameters.

Parameters:

tableName - Name of an existing table or view on which the operation will be performed.

columnName - Name of the column or an expression containing one or more column names on which the unique function would be applied.

offset - A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The default value is 0.The minimum allowed value is 0. The maximum allowed value is MAX_INT.

limit - A positive integer indicating the maximum number of results to be returned. Or END_OF_SET (-9999) to indicate that the max number of results should be returned. The number of records returned will never exceed the server's own limit, defined by the max_get_records_size parameter in the server configuration. Use hasMoreRecords to see if more records exist in the result to be fetched, and offset & limit to request subsequent pages of results. The default value is -9999.

encoding - Specifies the encoding for returned records. Supported values:

• BINARY: Indicates that the returned records should be binary encoded.
• JSON: Indicates that the returned records should be json encoded.

The default value is BINARY.

options - Optional parameters.

• COLLECTION_NAME: Name of a collection which is to contain the table specified in result_table. If the collection provided is non-existent, the collection will be automatically created. If empty, then the table will be a top-level table.
• EXPRESSION: Optional filter expression to apply to the table.
• SORT_ORDER: String indicating how the returned values should be sorted. Supported values:
  • ASCENDING
  • DESCENDING
  The default value is ASCENDING.
• RESULT_TABLE: The name of the table used to store the results. If present, no results are returned in the response. Has the same naming restrictions as tables. Not available if columnName is an unrestricted-length string.
• RESULT_TABLE_PERSIST: If true, then the result table specified in result_table will be persisted and will not expire unless a ttl is specified. If false, then the result table will be an in-memory table and will expire unless a ttl is specified otherwise. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• RESULT_TABLE_FORCE_REPLICATED: Force the result table to be replicated (ignores any sharding). Must be used in combination with the result_table option. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• RESULT_TABLE_GENERATE_PK: If true then set a primary key for the result table. Must be used in combination with the result_table option. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• TTL: Sets the TTL of the table specified in result_table.
• CHUNK_SIZE: Indicates the number of records per chunk to be used for the result table. Must be used in combination with the result_table option.
• VIEW_ID: ID of view of which the result table will be a member. The default value is ''.

The default value is an empty Map.

Method Detail

getClassSchema

public static org.apache.avro.Schema getClassSchema()

This method supports the Avro framework and is not intended to be called directly by the user.

Returns:

the schema for the class.

getTableName

public String getTableName()

Returns:

Name of an existing table or view on which the operation will be performed.

setTableName

public AggregateUniqueRequest setTableName(String tableName)

Parameters:

tableName - Name of an existing table or view on which the operation will be performed.

Returns:

this to mimic the builder pattern.

getColumnName

public String getColumnName()

Returns:

Name of the column or an expression containing one or more column names on which the unique function would be applied.

setColumnName

public AggregateUniqueRequest setColumnName(String columnName)

Parameters:

columnName - Name of the column or an expression containing one or more column names on which the unique function would be applied.

Returns:

this to mimic the builder pattern.

getOffset

public long getOffset()

Returns:

A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The default value is 0.The minimum allowed value is 0. The maximum allowed value is MAX_INT.

setOffset

public AggregateUniqueRequest setOffset(long offset)

Parameters:

offset - A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The default value is 0.The minimum allowed value is 0. The maximum allowed value is MAX_INT.

Returns:

this to mimic the builder pattern.

getLimit

public long getLimit()

Returns:

A positive integer indicating the maximum number of results to be returned. Or END_OF_SET (-9999) to indicate that the max number of results should be returned. The number of records returned will never exceed the server's own limit, defined by the max_get_records_size parameter in the server configuration. Use hasMoreRecords to see if more records exist in the result to be fetched, and offset & limit to request subsequent pages of results. The default value is -9999.

setLimit

public AggregateUniqueRequest setLimit(long limit)

Parameters:

limit - A positive integer indicating the maximum number of results to be returned. Or END_OF_SET (-9999) to indicate that the max number of results should be returned. The number of records returned will never exceed the server's own limit, defined by the max_get_records_size parameter in the server configuration. Use hasMoreRecords to see if more records exist in the result to be fetched, and offset & limit to request subsequent pages of results. The default value is -9999.

Returns:

this to mimic the builder pattern.

getEncoding

public String getEncoding()

Returns:

Specifies the encoding for returned records. Supported values:

• BINARY: Indicates that the returned records should be binary encoded.
• JSON: Indicates that the returned records should be json encoded.

The default value is BINARY.

setEncoding

public AggregateUniqueRequest setEncoding(String encoding)

Parameters:

encoding - Specifies the encoding for returned records. Supported values:

• BINARY: Indicates that the returned records should be binary encoded.
• JSON: Indicates that the returned records should be json encoded.

The default value is BINARY.

Returns:

this to mimic the builder pattern.

getOptions

public Map<String,String> getOptions()

Returns:

Optional parameters.

• COLLECTION_NAME: Name of a collection which is to contain the table specified in result_table. If the collection provided is non-existent, the collection will be automatically created. If empty, then the table will be a top-level table.
• EXPRESSION: Optional filter expression to apply to the table.
• SORT_ORDER: String indicating how the returned values should be sorted. Supported values:
  • ASCENDING
  • DESCENDING
  The default value is ASCENDING.
• RESULT_TABLE: The name of the table used to store the results. If present, no results are returned in the response. Has the same naming restrictions as tables. Not available if columnName is an unrestricted-length string.
• RESULT_TABLE_PERSIST: If true, then the result table specified in result_table will be persisted and will not expire unless a ttl is specified. If false, then the result table will be an in-memory table and will expire unless a ttl is specified otherwise. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• RESULT_TABLE_FORCE_REPLICATED: Force the result table to be replicated (ignores any sharding). Must be used in combination with the result_table option. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• RESULT_TABLE_GENERATE_PK: If true then set a primary key for the result table. Must be used in combination with the result_table option. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• TTL: Sets the TTL of the table specified in result_table.
• CHUNK_SIZE: Indicates the number of records per chunk to be used for the result table. Must be used in combination with the result_table option.
• VIEW_ID: ID of view of which the result table will be a member. The default value is ''.

The default value is an empty Map.

setOptions

public AggregateUniqueRequest setOptions(Map<String,String> options)

Parameters:

options - Optional parameters.

• COLLECTION_NAME: Name of a collection which is to contain the table specified in result_table. If the collection provided is non-existent, the collection will be automatically created. If empty, then the table will be a top-level table.
• EXPRESSION: Optional filter expression to apply to the table.
• SORT_ORDER: String indicating how the returned values should be sorted. Supported values:
  • ASCENDING
  • DESCENDING
  The default value is ASCENDING.
• RESULT_TABLE: The name of the table used to store the results. If present, no results are returned in the response. Has the same naming restrictions as tables. Not available if columnName is an unrestricted-length string.
• RESULT_TABLE_PERSIST: If true, then the result table specified in result_table will be persisted and will not expire unless a ttl is specified. If false, then the result table will be an in-memory table and will expire unless a ttl is specified otherwise. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• RESULT_TABLE_FORCE_REPLICATED: Force the result table to be replicated (ignores any sharding). Must be used in combination with the result_table option. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• RESULT_TABLE_GENERATE_PK: If true then set a primary key for the result table. Must be used in combination with the result_table option. Supported values:
  • TRUE
  • FALSE
  The default value is FALSE.
• TTL: Sets the TTL of the table specified in result_table.
• CHUNK_SIZE: Indicates the number of records per chunk to be used for the result table. Must be used in combination with the result_table option.
• VIEW_ID: ID of view of which the result table will be a member. The default value is ''.

The default value is an empty Map.

Returns:

this to mimic the builder pattern.

getSchema

public org.apache.avro.Schema getSchema()

This method supports the Avro framework and is not intended to be called directly by the user.

Specified by:

getSchema in interface org.apache.avro.generic.GenericContainer

Returns:

the schema object describing this class.

get

public Object get(int index)

This method supports the Avro framework and is not intended to be called directly by the user.

Specified by:

get in interface org.apache.avro.generic.IndexedRecord

Parameters:

index - the position of the field to get

Returns:

value of the field with the given index.

Throws:

IndexOutOfBoundsException

put

public void put(int index,
                Object value)

This method supports the Avro framework and is not intended to be called directly by the user.

Specified by:

put in interface org.apache.avro.generic.IndexedRecord

Parameters:

index - the position of the field to set

value - the value to set

Throws:

IndexOutOfBoundsException

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object