[DOC-12349] Update Query Execution Diagram

modules/learn/pages/services-and-indexes/services/query-service.adoc

@@ -11,7 +11,8 @@ The Query Service depends on both the _Index Service_ and the _Data Service_.
 The architecture of the _Query Service_ is shown by the following illustration:
 
 [#query_service_architecture]
-image::services-and-indexes/services/queryServiceArchitecture.png[,700,align=left]
+.Query Service Architecture
+image::services-and-indexes/services/queryServiceArchitecture.png[,700,align=centre]
 
 The principal components are:
 
@@ -26,17 +27,27 @@ Other data stores are also included, such as the store for the local filesystem.
 
 == Query Execution
 
-The sequence whereby queries are executed is shown below:
+The following diagram shows the sequence of operations during query execution.
 
 [#query_sequence]
-image::services-and-indexes/services/querySequence.png[,820,align=left]
-
-The client's {sqlpp} query is shown entering the Query Service at the left-hand side.
-The Query Processor performs its *Parse* routine, to validate the submitted statement, then creates the execution *Plan*.
-*Scan* operations are then performed on the relevant index, by accessing the *Index Service* or the *Search Service*.
-Next, *Fetch* operations are performed by accessing the *Data Service*, and the data duly returned is used in *Join* operations.
-The Query Service continues by performing additional processing, which includes *Filter*, *Aggregate*, and *Sort* operations.
-Note the degree of parallelism with which operations are frequently performed, represented by the vertically aligned groups of right-pointing arrows.
+.Query Execution Sequence
+[plantuml,query-execution,svg]
+....
+include::indexes:partial$diagrams/query-service.puml[]
+....
+
+When the Query Service receives the client's {sqlpp} query, it immediately passes it to the Query Processor.
+The Query Processor first parses the query to validate the statement and then creates an execution plan for the request. 
+
+The Execution Engine then begins executing the plan. 
+It performs Scan operations on the relevant index, using either the Index Service or the Search Service. 
+Next, it performs Fetch operations to get the actual data from the Data Service, and then uses this data for Join operations. 
+
+The Query Service processes the data further by applying Filter, Aggregate, Project, and Sort operations. 
+These operations often run in parallel, as represented by the vertically aligned groups of right-pointing arrows.
+Finally, it executes Offset and Limit operations to set the result size and starting point, and then streams the results back to the client.
+
+For more information about each of these operations, see xref:n1ql:n1ql-language-reference/selectintro.adoc#query-execution-phases[Query Phases].
 
 == Using {sqlpp}
 

preview/DOC-12349-query-execution-diagram.yml

@@ -0,0 +1,3 @@
+sources:
+  docs-devex:
+    branches: [DOC-12349-query-execution-diagram]