Golang
Pinot Client for Golang
- 1.
bin/quick-start-batch.sh
- 2.
git clone [email protected]:startreedata/pinot-client-go.git
cd pinot-client-go
- 3.
go build ./examples/batch-quickstart
./batch-quickstart
Initialize the Pinot client using one of the methods below.
pinotClient := pinot.NewFromZookeeper([]string{"localhost:2123"}, "", "QuickStartCluster")
pinotClient := pinot.NewFromBrokerList([]string{"localhost:8000"})
pinotClient := pinot.NewWithConfig(&pinot.ClientConfig{
ZkConfig: &pinot.ZookeeperConfig{
ZookeeperPath: zkPath,
PathPrefix: strings.Join([]string{zkPathPrefix, pinotCluster}, "/"),
SessionTimeoutSec: defaultZkSessionTimeoutSec,
},
ExtraHTTPHeader: map[string]string{
"extra-header":"value",
},
})
Code snippet:
pinotClient, err := pinot.NewFromZookeeper([]string{"localhost:2123"}, "", "QuickStartCluster")
if err != nil {
log.Error(err)
}
brokerResp, err := pinotClient.ExecuteSQL("baseballStats", "select count(*) as cnt, sum(homeRuns) as sum_homeRuns from baseballStats group by teamID limit 10")
if err != nil {
log.Error(err)
}
log.Infof("Query Stats: response time - %d ms, scanned docs - %d, total docs - %d", brokerResp.TimeUsedMs, brokerResp.NumDocsScanned, brokerResp.TotalDocs)
The query response has the following format:
type BrokerResponse struct {
AggregationResults []*AggregationResult `json:"aggregationResults,omitempty"`
SelectionResults *SelectionResults `json:"SelectionResults,omitempty"`
ResultTable *ResultTable `json:"resultTable,omitempty"`
Exceptions []Exception `json:"exceptions"`
TraceInfo map[string]string `json:"traceInfo,omitempty"`
NumServersQueried int `json:"numServersQueried"`
NumServersResponded int `json:"numServersResponded"`
NumSegmentsQueried int `json:"numSegmentsQueried"`
NumSegmentsProcessed int `json:"numSegmentsProcessed"`
NumSegmentsMatched int `json:"numSegmentsMatched"`
NumConsumingSegmentsQueried int `json:"numConsumingSegmentsQueried"`
NumDocsScanned int64 `json:"numDocsScanned"`
NumEntriesScannedInFilter int64 `json:"numEntriesScannedInFilter"`
NumEntriesScannedPostFilter int64 `json:"numEntriesScannedPostFilter"`
NumGroupsLimitReached bool `json:"numGroupsLimitReached"`
TotalDocs int64 `json:"totalDocs"`
TimeUsedMs int `json:"timeUsedMs"`
MinConsumingFreshnessTimeMs int64 `json:"minConsumingFreshnessTimeMs"`
}
Note that
AggregationResults
and SelectionResults
are holders for Pinot query language (PQL) queries.Meanwhile,
ResultTable
is the holder for SQL queries. ResultTable
is defined as:// ResultTable is a ResultTable
type ResultTable struct {
DataSchema RespSchema `json:"dataSchema"`
Rows [][]interface{} `json:"rows"`
}
RespSchema
is defined as:// RespSchema is response schema
type RespSchema struct {
ColumnDataTypes []string `json:"columnDataTypes"`
ColumnNames []string `json:"columnNames"`
}
There are multiple functions defined for
ResultTable
, such as the following:func (r ResultTable) GetRowCount() int
func (r ResultTable) GetColumnCount() int
func (r ResultTable) GetColumnName(columnIndex int) string
func (r ResultTable) GetColumnDataType(columnIndex int) string
func (r ResultTable) Get(rowIndex int, columnIndex int) interface{}
func (r ResultTable) GetString(rowIndex int, columnIndex int) string
func (r ResultTable) GetInt(rowIndex int, columnIndex int) int
func (r ResultTable) GetLong(rowIndex int, columnIndex int) int64
func (r ResultTable) GetFloat(rowIndex int, columnIndex int) float32
func (r ResultTable) GetDouble(rowIndex int, columnIndex int) float64
// Print Response Schema
for c := 0; c < brokerResp.ResultTable.GetColumnCount(); c++ {
fmt.Printf("%s(%s)\t", brokerResp.ResultTable.GetColumnName(c), brokerResp.ResultTable.GetColumnDataType(c))
}
fmt.Println()
// Print Row Table
for r := 0; r < brokerResp.ResultTable.GetRowCount(); r++ {
for c := 0; c < brokerResp.ResultTable.GetColumnCount(); c++ {
fmt.Printf("%v\t", brokerResp.ResultTable.Get(r, c))
}
fmt.Println()
}
Last modified 3mo ago