GPUdb C++ API
Version 7.0.19.0
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A set of input parameters for const. More...
#include <gpudb/protocol/aggregate_unique.h>
Public Member Functions | |
AggregateUniqueRequest () | |
Constructs an AggregateUniqueRequest object with default parameter values. More... | |
AggregateUniqueRequest (const std::string &tableName_, const std::string &columnName_, const int64_t offset_, const int64_t limit_, const std::map< std::string, std::string > &options_) | |
Constructs an AggregateUniqueRequest object with the specified parameters. More... | |
AggregateUniqueRequest (const std::string &tableName_, const std::string &columnName_, const int64_t offset_, const int64_t limit_, const std::string &encoding_, const std::map< std::string, std::string > &options_) | |
Constructs an AggregateUniqueRequest object with the specified parameters. More... | |
Public Attributes | |
std::string | tableName |
std::string | columnName |
int64_t | offset |
int64_t | limit |
std::string | encoding |
std::map< std::string, std::string > | options |
A set of input parameters for const.
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.
Definition at line 50 of file aggregate_unique.h.
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inline |
Constructs an AggregateUniqueRequest object with default parameter values.
Definition at line 57 of file aggregate_unique.h.
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inline |
Constructs an AggregateUniqueRequest object with the specified parameters.
[in] | tableName_ | Name of an existing table or view on which the operation will be performed. |
[in] | columnName_ | Name of the column or an expression containing one or more column names on which the unique function would be applied. |
[in] | offset_ | A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The minimum allowed value is 0. The maximum allowed value is MAX_INT. |
[in] | 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. |
[in] | options_ | Optional parameters.
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Definition at line 173 of file aggregate_unique.h.
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inline |
Constructs an AggregateUniqueRequest object with the specified parameters.
[in] | tableName_ | Name of an existing table or view on which the operation will be performed. |
[in] | columnName_ | Name of the column or an expression containing one or more column names on which the unique function would be applied. |
[in] | offset_ | A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The minimum allowed value is 0. The maximum allowed value is MAX_INT. |
[in] | 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. |
[in] | encoding_ | Specifies the encoding for returned records.
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[in] | options_ | Optional parameters.
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Definition at line 300 of file aggregate_unique.h.
std::string gpudb::AggregateUniqueRequest::columnName |
Definition at line 311 of file aggregate_unique.h.
std::string gpudb::AggregateUniqueRequest::encoding |
Definition at line 314 of file aggregate_unique.h.
int64_t gpudb::AggregateUniqueRequest::limit |
Definition at line 313 of file aggregate_unique.h.
int64_t gpudb::AggregateUniqueRequest::offset |
Definition at line 312 of file aggregate_unique.h.
std::map<std::string, std::string> gpudb::AggregateUniqueRequest::options |
Definition at line 315 of file aggregate_unique.h.
std::string gpudb::AggregateUniqueRequest::tableName |
Definition at line 310 of file aggregate_unique.h.