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SET NOCOUNT ON
DECLARE @p1 datetime
SET @p1 = GETDATE()

SELECT 
    [sql_handle],
    statement_start_offset,
    statement_end_offset,
    -- Use ISNULL here and in other columns to handle in-progress queries that are not yet in sys.dm_exec_query_stats.  
    -- These values only come from sys.dm_exec_query_stats. If the plan does not show up in sys.dm_exec_query_stats 
    -- (first execution of a still-in-progress query, visible in sys.dm_exec_requests), these values will be NULL. 
    MAX (plan_generation_num) AS plan_generation_num,
    plan_handle,
    MIN (creation_time) AS creation_time, 
    MAX (last_execution_time) AS last_execution_time,
    SUM (execution_count) AS execution_count,
    SUM (total_worker_time) AS total_worker_time,
    MIN (min_worker_time) AS min_worker_time,           -- NULLable
    MAX (max_worker_time) AS max_worker_time,
    SUM (total_physical_reads) AS total_physical_reads,
    MIN (min_physical_reads) AS min_physical_reads,     -- NULLable
    MAX (max_physical_reads) AS max_physical_reads,
    SUM (total_logical_writes) AS total_logical_writes,
    MIN (min_logical_writes) AS min_logical_writes,     -- NULLable
    MAX (max_logical_writes) AS max_logical_writes,
    SUM (total_logical_reads) AS total_logical_reads,
    MIN (min_logical_reads) AS min_logical_reads,       -- NULLable
    MAX (max_logical_reads) AS max_logical_reads,
    SUM (total_clr_time) AS total_clr_time,
    MIN (min_clr_time) AS min_clr_time,                 -- NULLable
    MAX (max_clr_time) AS max_clr_time,
    SUM (total_elapsed_time) AS total_elapsed_time,
    MIN (min_elapsed_time) AS min_elapsed_time,         -- NULLable
    MAX (max_elapsed_time) AS max_elapsed_time,
    @p1 AS collection_time
FROM
(
    SELECT  
        [sql_handle],
        statement_start_offset,
        statement_end_offset,
        plan_generation_num,
        plan_handle,
        creation_time,
        last_execution_time,
        execution_count,
        total_worker_time,
        min_worker_time,
        max_worker_time,
        total_physical_reads,
        min_physical_reads,
        max_physical_reads,
        total_logical_writes,
        min_logical_writes,
        max_logical_writes,
        total_logical_reads,
        min_logical_reads,
        max_logical_reads,
        total_clr_time,
        min_clr_time,
        max_clr_time,
        total_elapsed_time,
        min_elapsed_time,
        max_elapsed_time 
    FROM sys.dm_exec_query_stats AS q
    -- Temporary workaround for VSTS #91422.  This should be removed if/when sys.dm_exec_query_stats reflects in-progress queries. 
    UNION ALL 
    SELECT 
        r.[sql_handle],
        r.statement_start_offset,
        r.statement_end_offset,
        ISNULL (qs.plan_generation_num, 0) AS plan_generation_num,
        r.plan_handle,
        ISNULL (qs.creation_time, r.start_time) AS creation_time,
        r.start_time AS last_execution_time,
        1 AS execution_count,
        -- dm_exec_requests shows CPU time as ms, while dm_exec_query_stats 
        -- uses microseconds.  Convert ms to us. 
        r.cpu_time * 1000 AS total_worker_time,
        qs.min_worker_time,     -- min should not be influenced by in-progress queries
        r.cpu_time * 1000 AS max_worker_time,
        r.reads AS total_physical_reads,
        qs.min_physical_reads,  -- min should not be influenced by in-progress queries
        r.reads AS max_physical_reads,
        r.writes AS total_logical_writes,
        qs.min_logical_writes,  -- min should not be influenced by in-progress queries
        r.writes AS max_logical_writes,
        r.logical_reads AS total_logical_reads,
        qs.min_logical_reads,   -- min should not be influenced by in-progress queries
        r.logical_reads AS max_logical_reads,
        qs.total_clr_time,      -- CLR time is not available in dm_exec_requests
        qs.min_clr_time,        -- CLR time is not available in dm_exec_requests
        qs.max_clr_time,        -- CLR time is not available in dm_exec_requests
        -- dm_exec_requests shows elapsed time as ms, while dm_exec_query_stats 
        -- uses microseconds.  Convert ms to us. 
        r.total_elapsed_time * 1000 AS total_elapsed_time,
        qs.min_elapsed_time,    -- min should not be influenced by in-progress queries
        r.total_elapsed_time * 1000 AS max_elapsed_time
    FROM sys.dm_exec_requests AS r 
    LEFT OUTER JOIN sys.dm_exec_query_stats AS qs ON r.plan_handle = qs.plan_handle AND r.statement_start_offset = qs.statement_start_offset 
        AND r.statement_end_offset = qs.statement_end_offset 
    WHERE r.sql_handle IS NOT NULL 
) AS query_stats 
OUTER APPLY sys.dm_exec_sql_text (sql_handle) AS sql
GROUP BY [sql_handle], plan_handle, statement_start_offset, statement_end_offset 
ORDER BY [sql_handle], plan_handle, statement_start_offset, statement_end_offset