feat: implement storage for OTLP histogram (#2282)

* feat: implement new histogram data model

* feat:  use prometheus table format for histogram

* refactor: remove duplicated code

* fix: histogram tag column

* fix: use accumulated count in buckets

* refactor: using row based protocol for otlp WIP

* refactor: use row based writer for otlp.

Also updated row writer for owned keys

* refactor: use row writers for otlp

* test: add integration tests for histogram

* refactor: change le column name

src/frontend/src/instance/otlp.rs

@@ -42,7 +42,7 @@ impl OpenTelemetryProtocolHandler for Instance {
             .context(AuthSnafu)?;
         let (requests, rows) = otlp::to_grpc_insert_requests(request)?;
         let _ = self
-            .handle_inserts(requests, ctx)
+            .handle_row_inserts(requests, ctx)
             .await
             .map_err(BoxedError::new)
             .context(error::ExecuteGrpcQuerySnafu)?;

src/servers/src/influxdb.rs

@@ -53,7 +53,7 @@ impl TryFrom<InfluxdbRequest> for RowInsertRequests {
 
             // tags
             if let Some(tags) = tags {
-                let kvs = tags.iter().map(|(k, v)| (k.as_str(), v.as_str()));
+                let kvs = tags.iter().map(|(k, v)| (k.to_string(), v.as_str()));
                 row_writer::write_tags(table_data, kvs, &mut one_row)?;
             }
 
@@ -69,7 +69,7 @@ impl TryFrom<InfluxdbRequest> for RowInsertRequests {
                     ),
                     FieldValue::Boolean(v) => (ColumnDataType::Boolean, ValueData::BoolValue(*v)),
                 };
-                (k.as_str(), datatype, value)
+                (k.to_string(), datatype, value)
             });
             row_writer::write_fields(table_data, fields, &mut one_row)?;