Add doc for ODFE SQL demo

docs/user/presentations/111620-sql-demo.md

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+
+## Agenda
+
+Presenter: Chen Dai 
+
+Contact info: https://www.linkedin.com/in/chen-dai/
+
+Date: Nov 16, 2020
+
+Topics:
+
+1. A Brief Introduction to SQL and related projects
+2. What’re already supported in the SQL engine
+3. What’re new improvements in the SQL engine
+
+
+---
+## Introduction
+
+Here is a great blog that covers main features of SQL, Query Workbench, SQL-CLI, JDBC/ODBC driver: https://opendistro.github.io/for-elasticsearch/blog/odfe-updates/2020/06/An-overview-of-the-SQL-Engine-in-Open-Distro-for-Elasticsearch/
+
+Now we can start the demo. Note that you can follow the instructions in Resources (II) Demo Cluster to set up Elasticsearch and Kibana cluster locally.
+
+## Current SQL Engine
+
+Demonstrate the support for basic SQL queries, complex queries and Elasticsearch functions.
+
+```
+#Queries
+##Basic query
+SELECT Carrier, AVG(FlightDelayMin)
+FROM kibana_sample_data_flights
+WHERE OriginWeather = 'Sunny'
+GROUP BY Carrier
+HAVING AVG(FlightDelayMin) > 40
+ORDER BY Carrier
+LIMIT 3
+
+##Complex query
+SELECT f1.FlightNum, f2.Carrier
+FROM kibana_sample_data_flights f1
+JOIN kibana_sample_data_flights f2
+  ON f1.FlightNum = f2.FlightNum
+WHERE f1.OriginWeather = 'Sunny'
+
+#Elasticsearch
+##Full text search
+SELECT customer_full_name
+FROM kibana_sample_data_ecommerce
+WHERE MATCH_QUERY(customer_full_name, 'King')
+
+##Nested field query
+SELECT * FROM employees LIMIT 10
+
+SELECT p.name, p.started_year
+FROM employees e,
+    e.projects p
+WHERE p.name LIKE '%Redshift%'
+
+```
+
+## Improvements on SQL Engine
+
+Architecture changes: https://github.com/opendistro-for-elasticsearch/sql/blob/develop/docs/dev/Architecture.md
+
+```
+#New query planner: explain this to see
+SELECT Carrier, AVG(FlightDelayMin)
+FROM kibana_sample_data_flights
+WHERE OriginWeather = 'Sunny' 
+GROUP BY Carrier
+
+#Extensibility example: ranking window function
+SELECT
+    Carrier, FlightDelayMin,
+    RANK() OVER(
+    PARTITION BY Carrier
+    ORDER BY FlightDelayMin DESC
+    ) AS rnk
+FROM kibana_sample_data_flights
+WHERE FlightDelayMin > 0
+
+#New expression system
+SELECT
+  SUBSTRING(Carrier, 1, 2) AS sub,
+  AVG(ABS(FlightDelayMin * -10))
+FROM kibana_sample_data_flights
+WHERE OriginWeather = 'Sunny' 
+GROUP BY sub
+```
+
+## Features in Development
+
+1. SQL standard
+    1. SQL Functions
+    2. Complex queries: JOINs
+2. Elasticsearch
+    1. More nested field support
+    2. More metrics and bucket functions
+
+Contribution: https://github.com/opendistro-for-elasticsearch/sql/blob/develop/docs/developing.rst
+
+---
+## Resources
+
+### (I) Documentations
+
+1. SQL reference manual
+    1. https://opendistro.github.io/for-elasticsearch-docs/docs/sql/
+    2. https://github.com/opendistro-for-elasticsearch/sql/blob/develop/docs/user/index.rst
+2. Setting for enabling new SQL engine: https://github.com/opendistro-for-elasticsearch/sql/blob/master/docs/user/admin/settings.rst#opendistro-sql-engine-new-enabled
+
+### (II) Demo Cluster Setup
+
+1. Create a Docker compose file as below
+2. Start docker container: `docker-compose up`
+3. Visit Kibana on http://localhost:5601 (default username and password are both `admin`)
+4. Load Kibana sample flights and ecommerce indices and `employees` test index as below
+5. Start playing with our SQL plugin
+
+
+`docker-compose.yml` sample:
+
+```
+version: '3'
+services:
+  odfe-node1:
+    image: amazon/opendistro-for-elasticsearch:1.11.0
+    container_name: odfe-node1
+    environment:
+      - cluster.name=odfe-cluster
+      - discovery.type=single-node
+      - "ES_JAVA_OPTS=-Xms1024m -Xmx1024m" # minimum and maximum Java heap size, recommend setting both to 50% of system RAM
+    ports:
+      - 9200:9200
+      - 9600:9600 # required for Performance Analyzer
+    networks:
+      - odfe-net
+  kibana:
+    image: amazon/opendistro-for-elasticsearch-kibana:1.11.0
+    container_name: odfe-kibana
+    ports:
+      - 5601:5601
+    expose:
+      - "5601"
+    environment:
+      ELASTICSEARCH_URL: https://odfe-node1:9200
+      ELASTICSEARCH_HOSTS: https://odfe-node1:9200
+    networks:
+      - odfe-net
+
+networks:
+  odfe-net:
+```
+
+Index mapping for `employees`:
+
+```
+PUT employees
+{
+  "mappings": {
+    "properties": {
+      "id": {
+        "type": "long"
+      },
+      "name": {
+        "type": "text",
+        "fields": {
+          "keyword": {
+            "type": "keyword",
+            "ignore_above": 256
+          }
+        }
+      },
+      "projects": {
+        "type": "nested",
+        "properties": {
+          "name": {
+            "type": "text",
+            "fields": {
+              "keyword": {
+                "type": "keyword"
+              }
+            },
+            "fielddata": true
+          },
+          "started_year": {
+            "type": "long"
+          }
+        }
+      },
+      "title": {
+        "type": "text",
+        "fields": {
+          "keyword": {
+            "type": "keyword",
+            "ignore_above": 256
+          }
+        }
+      }
+    }
+  }
+}
+
+POST employees/_bulk
+{"index":{"_id":"1"}}
+{"id":3,"name":"Bob Smith","title":null,"projects":[{"name":"AWS Redshift Spectrum querying","started_year":1990},{"name":"AWS Redshift security","started_year":1999},{"name":"AWS Aurora security","started_year":2015}]}
+{"index":{"_id":"2"}}
+{"id":4,"name":"Susan Smith","title":"Dev Mgr","projects":[]}
+{"index":{"_id":"3"}}
+{"id":6,"name":"Jane Smith","title":"Software Eng 2","projects":[{"name":"AWS Redshift security","started_year":1998},{"name":"AWS Hello security","started_year":2015,"address":[{"city":"Dallas","state":"TX"}]}]}
+```
+