Query Definitions
-----------------

Place in this directory query definitions in JSON format
used by the Historical Flow Explorer.

Built-in examples are provided and can be used as starting
point for building new queries. Please note that:

- The 'select' object can contain a list of items in the 'items'
  array. A raw SQL select can be defined in the 'sql' string. A
  list of items is still required to define the columns and value 
  type (if not a plain column).

- It is possible to use SQL functions as 'select' item as shown
  in the examples by specifying the 'func' (e.g. SUM) and the
  parameter (e.g. TOTAL_BYTES)

- The 'filters' object contains a list of items to filter in the
  'items' array. Defining the 'name' is enough, however additional
  settings can be configured to overwrite the default (e.g. the
  operators to be used, the input type, optional field, etc.).

- The interface index, and first/last seen are automatically included
  by the engine: no need to define them as filters in the query definition.

- Custom SQL code can be also provided:
  - For sections of the query (e.g. select.sql)
  - For the full query - in this case $FROM$, $WHERE$, $GROUPBY$, $ORDERBY$, $LIMIT$ 
    tokens can be used to inject conditions and values built from the engine.

Examples
--------

Select example - list of fields:

	"select" : {
		"items" : [
			{
				"name": "IPV4_SRC_ADDR",
			},
			{
				"name": "IPV4_DST_ADDR", 
			},
			{
				"name": "VLAN_ID",
			},
			{
				"name": "L7_PROTO",
			},
			{
				"name": "bytes",
				"func": "SUM",
				"param": "TOTAL_BYTES",
				"value_type": "bytes",
			}
		]
	}

Select example - custom SQL (note: list of items still need to be declared to build the datatable structure):

	"select" : {
		"sql": "IPv4NumToString(IPV4_SRC_ADDR) IPV4_SRC_ADDR_FORMATTED, IPv4NumToString(IPV4_DST_ADDR) IPV4_DST_ADDR_FORMATTED, L7_PROTO, SUM(TOTAL_BYTES) bytes",
		"items" : [
			{ 
				"name" : "IPV4_SRC_ADDR" 
			},
			{
				"name" : "IPV6_SRC_ADDR"
			},
			{
				"name" : "bytes",
				"func" : "",
				"value_type" : "bytes"
			}
		]
	}

Filters examples:

	"filters" : {
		"items" : [
			{
				"name": "IPV4_SRC_ADDR"
			},
			{
				"name": "TOTAL_BYTES",
				"op": "gte",
				"value_type": "number",
				"input": "user",
				"optional": true
			},
			{
				"name": "L7_PROTO",
				"op": "eq",
				"value_type": "l7_proto",
				"input": "fixed",
				"value": "TLS"
			}
		]
	}

Full query using Custom SQL example (see top_receiver_networks.json):

	"sql" : "SELECT VLAN_ID, NETWORK_ID, SUM(BYTES) AS total_bytes FROM (SELECT VLAN_ID,SRC_NETWORK_ID AS NETWORK_ID, DST2SRC_BYTES AS BYTES $FROM$ $WHERE$ AND SRC_NETWORK_ID!=4294967295 UNION ALL SELECT VLAN_ID,DST_NETWORK_ID AS NETWORK_ID, SRC2DST_BYTES AS BYTES $FROM$ $WHERE$ AND DST_NETWORK_ID!=4294967295) AS f $GROUPBY$ $ORDERBY$ $LIMIT$"

