Add experimental XML output

last_explained_xml.sql

@@ -0,0 +1,86 @@
+-- experimental XML output
+WITH tree(operator_id, parent, object_name, rows, level, path, explain_time, cycle)
+AS
+(
+SELECT 1 AS operator_id
+     , null AS parent 
+     , null AS object_name
+     , null AS stream_count
+     , 0 level
+     , CAST('001' AS VARCHAR(1000)) path
+     , max(explain_time) explain_time
+     , 0
+  FROM SYSTOOLS.EXPLAIN_OPERATOR O
+ WHERE O.EXPLAIN_REQUESTER = SESSION_USER
+
+UNION ALL
+
+SELECT s.source_id AS operator_id
+     , s.target_id AS parent
+     , s.object_name AS object_name
+     , s.stream_count AS rows
+     , level + 1
+     , tree.path || '/' || LPAD(CAST(s.source_id AS VARCHAR(3)), 3, '0')  path
+     , tree.explain_time
+     , POSITION('/' || LPAD(CAST(s.source_id AS VARCHAR(3)), 3, '0')  || '/' IN path USING OCTETS)
+  FROM tree
+     , SYSTOOLS.EXPLAIN_STREAM S
+ WHERE s.target_id    = tree.operator_id
+   AND s.explain_time = tree.explain_time
+   AND S.Object_Name IS NULL
+   AND S.explain_requester = SESSION_USER
+   AND tree.cycle = 0
+   AND level < 100
+)
+SELECT tree.parent
+     , XMLELEMENT(NAME "operation"
+                 , XMLATTRIBUTES(tree.operator_id                   AS "operation_id"
+                               , TRIM(CAST(operator_type  AS VARCHAR(6))) AS "operator_type"
+                               , object_name                        AS "object_name"
+                               , CAST(rows           AS BIGINT    ) AS "rows"
+                               , CAST(TOTAL_COST     AS BIGINT    ) AS "total_cost"
+                               , CAST(IO_COST        AS BIGINT    ) AS "io_cost"
+                               , CAST(CPU_COST       AS BIGINT    ) AS "cpu_cost"
+                               , CAST(FIRST_ROW_COST AS BIGINT    ) AS "first_row_cost"
+                               , CAST(BUFFERS        AS BIGINT    ) AS "buffers"
+                               )
+     , (SELECT XMLAGG(XMLELEMENT(NAME "argument"
+                               , XMLATTRIBUTES(TRIM(argument_type) AS "type"
+                                             , TRIM(argument_value) AS "value"
+                                             )
+                               )
+                     )
+          FROM SYSTOOLS.EXPLAIN_ARGUMENT arg
+         WHERE arg.operator_id       = tree.operator_id
+           AND arg.explain_time      = tree.explain_time
+           AND arg.explain_requester = SESSION_USER
+       )
+     , (SELECT XMLAGG(XMLELEMENT(NAME "actual"
+                               , XMLATTRIBUTES(actual_type  AS "type"
+                                             , actual_value AS "value"
+                                             )
+                               )
+                     )
+          FROM SYSTOOLS.EXPLAIN_ACTUALS act
+         WHERE act.operator_id       = tree.operator_id
+           AND act.explain_time      = tree.explain_time
+           AND act.explain_requester = SESSION_USER
+       )
+     , (SELECT XMLAGG(XMLELEMENT(NAME "predicate"
+                               , XMLATTRIBUTES(TRIM(CAST(how_applied AS VARCHAR(10))) AS "how_applied")
+                               , predicate_text
+                               )
+                     )
+         FROM SYSTOOLS.EXPLAIN_PREDICATE pred
+        WHERE pred.operator_id  = tree.operator_id
+          AND pred.explain_time = tree.explain_time
+          AND pred.explain_requester = SESSION_USER
+       )
+     )
+  FROM tree
+  LEFT JOIN SYSTOOLS.EXPLAIN_OPERATOR O
+    ON (    o.operator_id  = tree.operator_id
+        AND o.explain_time = tree.explain_time
+        AND o.explain_requester = SESSION_USER
+       ) 
+ORDER BY path