group_begin / group_end: Result Set Delimiters

This section describes the query delimiters that indicate where the results of a query begin and end.

group_begin message

The group_begin message marks the beginning of a set of records returned by a SOW query.

For more information, see the State of the World (SOW) Topics and Querying the State of the World (SOW) chapters in the AMPS User Guide.

Header Fields

The following table contains the header fields returned in a group_begin message. Notice that the wire format of the message may abbreviate these field names or encode them differently:

Field	Description
cmd	Type of message. Always group_begin, as encoded by the protocol.
query_id	The query_id of the query that produced this message. If no explicit query ID was submitted, this will be the command ID of the command that ran the query.

group_end message

The group_end message marks the end of a set of records returned by a SOW query.

For more information, see the State of the World (SOW) Topics and Querying the State of the World (SOW) chapters in the AMPS User Guide.

Header Fields

The following table contains the header fields returned in a group_end message:

Field	Description
cmd	Type of message. Always group_end, as encoded by the protocol.
query_id	The query_id of the query that produced this message. If no explicit query ID was submitted, this will be the command ID of the command that ran the query.