/aggregate/unpivot

URL: http://<db.host>:<db.port>/aggregate/unpivot

Rotate the column values into rows values.

For unpivot details and examples, see Unpivot. For limitations, see Unpivot Limitations.

Unpivot is used to normalize tables that are built for cross tabular reporting purposes. The unpivot operator rotates the column values for all the pivoted columns. A variable column, value column and all columns from the source table except the unpivot columns are projected into the result table. The variable column and value columns in the result table indicate the pivoted column name and values respectively.

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

Input Parameter Description

Name

Type

Description

table_name

string

Name of the table on which the operation will be performed. Must be an existing table/view, in [schema_name.]table_name format, using standard name resolution rules.

column_names

array of strings

List of column names or expressions. A wildcard '*' can be used to include all the non-pivoted columns from the source table.

variable_column_name

string

Specifies the variable/parameter column name. The default value is ''.

value_column_name

string

Specifies the value column name. The default value is ''.

pivoted_columns

array of strings

List of one or more values typically the column names of the input table. All the columns in the source table must have the same data type.

encoding

string

Specifies the encoding for returned records. The default value is binary.

Supported Values	Description
binary	Indicates that the returned records should be binary encoded.
json	Indicates that the returned records should be json encoded.

options

map of string to strings

Optional parameters. The default value is an empty map ( {} ).

Supported Parameters (keys)	Parameter Description
create_temp_table	If true, a unique temporary table name will be generated in the sys_temp schema and used in place of result_table. If result_table_persist is false (or unspecified), then this is always allowed even if the caller does not have permission to create tables. The generated name is returned in qualified_result_table_name. The default value is false. The supported values are: true false
collection_name	[DEPRECATED--please specify the containing schema as part of result_table and use /create/schema to create the schema if non-existent] Name of a schema which is to contain the table specified in result_table. If the schema is non-existent, it will be automatically created.
result_table	The name of a table used to store the results, in [schema_name.]table_name format, using standard name resolution rules and meeting table naming criteria. If present, no results are returned in the response.
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. The default value is false. The supported values are: true false
expression	Filter expression to apply to the table prior to unpivot processing.
order_by	Comma-separated list of the columns to be sorted by; e.g. 'timestamp asc, x desc'. The columns specified must be present in input table. If any alias is given for any column name, the alias must be used, rather than the original column name. The default value is ''.
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.
chunk_column_max_memory	Indicates the target maximum data size for each column in a chunk to be used for the result table. Must be used in combination with the result_table option.
chunk_max_memory	Indicates the target maximum data size for all columns in a chunk to be used for the result table. Must be used in combination with the result_table option.
limit	The number of records to keep. The default value is ''.
ttl	Sets the TTL of the table specified in result_table.
view_id	view this result table is part of. The default value is ''.
create_indexes	Comma-separated list of columns on which to create indexes on the table specified in result_table. The columns specified must be present in output column names. If any alias is given for any column name, the alias must be used, rather than the original column name.
result_table_force_replicated	Force the result table to be replicated (ignores any sharding). Must be used in combination with the result_table option. The default value is false. The supported values are: true false

Output Parameter Description

The GPUdb server embeds the endpoint response inside a standard response structure which contains status information and the actual response to the query. Here is a description of the various fields of the wrapper:

Name

Type

Description

status

String

'OK' or 'ERROR'

message

String

Empty if success or an error message

data_type

String

'aggregate_unpivot_response' or 'none' in case of an error

data

String

Empty string

data_str

JSON or String

This embedded JSON represents the result of the /aggregate/unpivot endpoint:

Name

Type

Description

table_name

string

Typically shows the result-table name if provided in the request (Ignore otherwise).

response_schema_str

string

Avro schema of output parameter binary_encoded_response or output parameter json_encoded_response.

binary_encoded_response

bytes

Avro binary encoded response.

json_encoded_response

string

Avro JSON encoded response.

total_number_of_records

long

Total/Filtered number of records.

has_more_records

boolean

Too many records. Returned a partial set.

info

map of string to strings

Additional information. The default value is an empty map ( {} ).

Possible Parameters (keys)	Parameter Description
qualified_result_table_name	The fully qualified name of the table (i.e. including the schema) used to store the results.

Empty string in case of an error.