add fiels to feel out using path to extract

ideas/sql_from_srce_definition.sql

@@ -0,0 +1,52 @@
+WITH s AS (
+select 
+$${
+    "name":"DMAPI",
+    "source":"client_file",
+    "loading_function":"csv",
+    "constraint":[
+        "{doc}"
+    ],
+    "schema_type":"JSONB_POPULATE",
+    "table_schema":[
+        {
+            "path":"{doc,origin_addresses,0}",
+            "type":"text",
+            "column_name":"origin_address"
+        },
+        {
+            "path":"{doc,destination_addresses,0}",
+            "type":"text",
+            "column_name":"origin_address"
+        },
+        {
+            "path":"{doc,status}",
+            "type":"text",
+            "column_name":"status"
+        },
+        {
+            "path":"{doc,rows,0,elements,0,distance,value}",
+            "type":"numeric",
+            "column_name":"distance"
+        },
+        {
+            "path":"{doc,rows,0,elements,0,duration,value}",
+            "type":"numeric",
+            "column_name":"duration"
+        }
+    ]
+}$$::jsonb->'table_schema' defn
+)
+,ext AS (
+SELECT 
+    ae.v->>'path' path
+    ,ae.v->>'type' dtype
+    ,ae.v->>'column_name' column_name
+FROM 
+    s
+    LEFT JOIN LATERAL JSONB_ARRAY_ELEMENTS(s.defn) ae(v) ON TRUE
+)
+SELECT
+    'SELECT '||string_agg('(rec#>>('''||path||'''::text[]))::'||dtype||' AS '||column_name,', ')||' FROM tps.trans WHERE srce = ''DMAPI'''
+FROM
+    ext

perf_test/parse_jsonb_with_path.sql

@@ -0,0 +1,44 @@
+create temp table x as (
+select
+	t.rec
+from
+	generate_series(1,1000000,1) s
+	inner join tps.trans t on
+		srce = 'DMAPI'
+) with data;
+
+
+create temp table x2 as (	
+select
+	(
+		rec #>>(
+			'{doc,origin_addresses,0}'::text[]
+		)
+	)::text as origin_address,
+	(
+		rec #>>(
+			'{doc,destination_addresses,0}'::text[]
+		)
+	)::text as desatination_address,
+	(
+		rec #>>(
+			'{doc,status}'::text[]
+		)
+	)::text as status,
+	(
+		rec #>>(
+			'{doc,rows,0,elements,0,distance,value}'::text[]
+		)
+	)::numeric as distance,
+	(
+		rec #>>(
+			'{doc,rows,0,elements,0,duration,value}'::text[]
+		)
+	)::numeric as duration
+from
+	x
+) with data;
+	
+
+drop table x;
+drop table x2;