[ 
https://issues.apache.org/jira/browse/KYLIN-5730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xiaoxiang Yu updated KYLIN-5730:
--------------------------------
    Description: 
h2. Background

When user enable this feature, the query insight page will display helpful 
message

for user to understand why model is not match and what to do in next step.

 

Following messages will display some query analytics, including at least:
 # RelNode Tree
 # OLAPContext and matched Model for each context
 # Spark Physical Plan

Configuration entry is 'kylin.query.dryrun-enabled', at project level.
h2. How to use
 # enable this in project configuration
 # send a query in Insight page
 # read Dry-run message and fix something and retry

 
h4. Dry-run message sample:

1. Last Exception :
  No realization found for \{id = 0, model = not matched, fact table = 
TPCH_CN.LINEITEM}
  Incapable message : MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 
MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 
MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 

2. OLAPContext(s) and matched model(s) :
 Ctx=0 is not matched by any model/snapshot, recommend :
 {
   "Fact Table" : "TPCH_CN.LINEITEM",
   "Dimension Tables" : [ "TPCH_CN.REGION", "TPCH_CN.ORDERS", 
"TPCH_CN.SUPPLIER", "TPCH_CN.PART", "TPCH_CN.CUSTOMER", "TPCH_CN.NATION"],
   "Query Columns" : [ "TPCH_CN.NATION.N_NAME", "TPCH_CN.ORDERS.O_ORDERDATE", 
"TPCH_CN.REGION.R_NAME", "TPCH_CN.PART.P_TYPE", "TPCH_CN.LINEITEM.DISC_PRICE"],
   "Dimension(Group by)" : [ "TPCH_CN.ORDERS.O_ORDERDATE"],
   "Dimension(Filter cond)" : [ "TPCH_CN.ORDERS.O_ORDERDATE", 
"TPCH_CN.REGION.R_NAME", "TPCH_CN.PART.P_TYPE"],
   "Measure" : [ "SUM(UNKNOWN_ALIAS.$F1)", "SUM(T_1_4CD6601C.DISC_PRICE)"],
   "Join" : "
Fact: [T_1_4CD6601C:LINEITEM]
  Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_2_716C1DB8:PART] ON [L_PARTKEY] = 
[P_PARTKEY]
  Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_3_6D21031C:SUPPLIER] ON 
[L_SUPPKEY] = [S_SUPPKEY]
    Dim: [T_3_6D21031C:SUPPLIER] INNER JOIN [T_7_4F00CD31:NATION] ON 
[S_NATIONKEY] = [N_NATIONKEY]
  Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_4_5CEAD9DF:ORDERS] ON [L_ORDERKEY] 
= [O_ORDERKEY]
    Dim: [T_4_5CEAD9DF:ORDERS] INNER JOIN [T_5_54B979E7:CUSTOMER] ON 
[O_CUSTKEY] = [C_CUSTKEY]
      Dim: [T_5_54B979E7:CUSTOMER] INNER JOIN [T_6_42081A08:NATION] ON 
[C_NATIONKEY] = [N_NATIONKEY]
        Dim: [T_6_42081A08:NATION] INNER JOIN [T_8_B14C00A:REGION] ON 
[N_REGIONKEY] = [R_REGIONKEY]",
   "Index Id" : 0,
   "Query Column / Index Column" : "5 / 0",
   "Index Columns" : []
 }


3. RelNode(with ctx id) :
  OLAPToEnumerableConverter
  LimitRel(ctx=[0@null], fetch=[500])
    SortRel(sort0=[$0], dir0=[ASC-nulls-first], ctx=[0@null])
      ProjectRel(O_YEAR=[$0], MKT_SHARE=[/($1, $2)], ctx=[0@null])
        AggregateRel(group-set=[[0]], groups=[null], agg#0=[SUM($1)], 
agg#1=[SUM($2)], ctx=[0@null])
          ProjectRel(O_YEAR=[EXTRACT(FLAG(YEAR), $54)], $f1=[CASE(=($72, 
'BRAZIL'), $16, 0)], VOLUME=[$16], ctx=[0@null])
            FilterRel(condition=[AND(=($76, 'AMERICA'), >=($54, 1995-01-01), 
<=($54, 1996-12-31), =($38, 'ECONOMY ANODIZED STEEL'))], ctx=[0@null])
              JoinRel(condition=[=($69, $75)], joinType=[inner], ctx=[0@null])
                JoinRel(condition=[=($46, $71)], joinType=[inner], ctx=[0@null])
                  JoinRel(condition=[=($62, $67)], joinType=[inner], 
ctx=[0@null])
                    JoinRel(condition=[=($51, $59)], joinType=[inner], 
ctx=[0@null])
                      JoinRel(condition=[=($0, $50)], joinType=[inner], 
ctx=[0@null])
                        JoinRel(condition=[=($2, $43)], joinType=[inner], 
ctx=[0@null])
                          JoinRel(condition=[=($1, $34)], joinType=[inner], 
ctx=[0@null])
                            TableScan(table=[[TPCH_CN, LINEITEM]], 
ctx=[0@null], fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33]])
                            TableScan(table=[[TPCH_CN, PART]], ctx=[0@null], 
fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8]])
                          TableScan(table=[[TPCH_CN, SUPPLIER]], ctx=[0@null], 
fields=[[0, 1, 2, 3, 4, 5, 6]])
                        TableScan(table=[[TPCH_CN, ORDERS]], ctx=[0@null], 
fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8]])
                      TableScan(table=[[TPCH_CN, CUSTOMER]], ctx=[0@null], 
fields=[[0, 1, 2, 3, 4, 5, 6, 7]])
                    TableScan(table=[[TPCH_CN, NATION]], ctx=[0@null], 
fields=[[0, 1, 2, 3]])
                  TableScan(table=[[TPCH_CN, NATION]], ctx=[0@null], 
fields=[[0, 1, 2, 3]])
                TableScan(table=[[TPCH_CN, REGION]], ctx=[0@null], fields=[[0, 
1, 2]])

4. SQL Text :
select /*+ MODEL_PRIORITY(Q8) */ o_year,
 sum(case
 when nation = 'BRAZIL'
 then volume
 else 0
 end) / sum(volume)
 as mkt_share
from
 (
 select year(o_orderdate) as o_year,
 LINEITEM.DISC_PRICE as volume,
 n2.n_name as nation
 from
 tpch_cn.lineitem
 join tpch_cn.part on p_partkey = l_partkey
 join tpch_cn.supplier on s_suppkey = l_suppkey
 join tpch_cn.orders on l_orderkey = o_orderkey
 join tpch_cn.customer on o_custkey = c_custkey
 join tpch_cn.nation n1 on c_nationkey = n1.n_nationkey
 join tpch_cn.nation n2 on s_nationkey = n2.n_nationkey
 join tpch_cn.region on n1.n_regionkey = r_regionkey
 where
 r_name = 'AMERICA'
 and o_orderdate between '1995-01-01' and '1996-12-31'
 and p_type = 'ECONOMY ANODIZED STEEL'
 ) as all_nations
group by
 o_year
order by
 o_year
LIMIT 500

5. Physical plan :
 not exists

<-------------------- Dry Run Info -------------------->

 
h2. Screenshots
h4. Step1 : enable this in project configuration

!KYLIN-5730-01.png!
h4. Step2 : send a query in Insight page

!KYLIN-5730-02.png!
h4. Step3 : Dry-run message in Insight page

!KYLIN-5730-03.png!

 

 

  was:
h2. Background

When user enable this feature, the query insight page will display helpful 
message

for user to understand why model is not match.

 

Following messages will display some query analytics, including at least:
 # RelNode Tree
 # OLAPContext and matched Model for each context
 # Spark Physical Plan

Configuration entry is 'kylin.query.dryrun-enabled', at project level.
h2. How to use
 # enable this in project configuration
 # send a query in Insight page
 # receive and read Dry-run message

 
h4. Dry-run message sample:
{quote}1. Last Exception :
  No realization found for \{id = 0, model = not matched, fact table = 
TPCH_CN.LINEITEM}
  Incapable message : MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 
MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 
MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 

2. OLAPContext(s) and matched model(s) :
 Ctx=0 is not matched by any model/snapshot, recommend :
 {
   "Fact Table" : "TPCH_CN.LINEITEM",
   "Dimension Tables" : [ "TPCH_CN.REGION", "TPCH_CN.ORDERS", 
"TPCH_CN.SUPPLIER", "TPCH_CN.PART", "TPCH_CN.CUSTOMER", "TPCH_CN.NATION"],
   "Query Columns" : [ "TPCH_CN.NATION.N_NAME", "TPCH_CN.ORDERS.O_ORDERDATE", 
"TPCH_CN.REGION.R_NAME", "TPCH_CN.PART.P_TYPE", "TPCH_CN.LINEITEM.DISC_PRICE"],
   "Dimension(Group by)" : [ "TPCH_CN.ORDERS.O_ORDERDATE"],
   "Dimension(Filter cond)" : [ "TPCH_CN.ORDERS.O_ORDERDATE", 
"TPCH_CN.REGION.R_NAME", "TPCH_CN.PART.P_TYPE"],
   "Measure" : [ "SUM(UNKNOWN_ALIAS.$F1)", "SUM(T_1_4CD6601C.DISC_PRICE)"],
   "Join" : "
Fact: [T_1_4CD6601C:LINEITEM]
  Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_2_716C1DB8:PART] ON [L_PARTKEY] = 
[P_PARTKEY]
  Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_3_6D21031C:SUPPLIER] ON 
[L_SUPPKEY] = [S_SUPPKEY]
    Dim: [T_3_6D21031C:SUPPLIER] INNER JOIN [T_7_4F00CD31:NATION] ON 
[S_NATIONKEY] = [N_NATIONKEY]
  Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_4_5CEAD9DF:ORDERS] ON [L_ORDERKEY] 
= [O_ORDERKEY]
    Dim: [T_4_5CEAD9DF:ORDERS] INNER JOIN [T_5_54B979E7:CUSTOMER] ON 
[O_CUSTKEY] = [C_CUSTKEY]
      Dim: [T_5_54B979E7:CUSTOMER] INNER JOIN [T_6_42081A08:NATION] ON 
[C_NATIONKEY] = [N_NATIONKEY]
        Dim: [T_6_42081A08:NATION] INNER JOIN [T_8_B14C00A:REGION] ON 
[N_REGIONKEY] = [R_REGIONKEY]",
   "Index Id" : 0,
   "Query Column / Index Column" : "5 / 0",
   "Index Columns" : []
 }


3. RelNode(with ctx id) :
  OLAPToEnumerableConverter
  LimitRel(ctx=[0@null], fetch=[500])
    SortRel(sort0=[$0], dir0=[ASC-nulls-first], ctx=[0@null])
      ProjectRel(O_YEAR=[$0], MKT_SHARE=[/($1, $2)], ctx=[0@null])
        AggregateRel(group-set=[[0]], groups=[null], agg#0=[SUM($1)], 
agg#1=[SUM($2)], ctx=[0@null])
          ProjectRel(O_YEAR=[EXTRACT(FLAG(YEAR), $54)], $f1=[CASE(=($72, 
'BRAZIL'), $16, 0)], VOLUME=[$16], ctx=[0@null])
            FilterRel(condition=[AND(=($76, 'AMERICA'), >=($54, 1995-01-01), 
<=($54, 1996-12-31), =($38, 'ECONOMY ANODIZED STEEL'))], ctx=[0@null])
              JoinRel(condition=[=($69, $75)], joinType=[inner], ctx=[0@null])
                JoinRel(condition=[=($46, $71)], joinType=[inner], ctx=[0@null])
                  JoinRel(condition=[=($62, $67)], joinType=[inner], 
ctx=[0@null])
                    JoinRel(condition=[=($51, $59)], joinType=[inner], 
ctx=[0@null])
                      JoinRel(condition=[=($0, $50)], joinType=[inner], 
ctx=[0@null])
                        JoinRel(condition=[=($2, $43)], joinType=[inner], 
ctx=[0@null])
                          JoinRel(condition=[=($1, $34)], joinType=[inner], 
ctx=[0@null])
                            TableScan(table=[[TPCH_CN, LINEITEM]], 
ctx=[0@null], fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33]])
                            TableScan(table=[[TPCH_CN, PART]], ctx=[0@null], 
fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8]])
                          TableScan(table=[[TPCH_CN, SUPPLIER]], ctx=[0@null], 
fields=[[0, 1, 2, 3, 4, 5, 6]])
                        TableScan(table=[[TPCH_CN, ORDERS]], ctx=[0@null], 
fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8]])
                      TableScan(table=[[TPCH_CN, CUSTOMER]], ctx=[0@null], 
fields=[[0, 1, 2, 3, 4, 5, 6, 7]])
                    TableScan(table=[[TPCH_CN, NATION]], ctx=[0@null], 
fields=[[0, 1, 2, 3]])
                  TableScan(table=[[TPCH_CN, NATION]], ctx=[0@null], 
fields=[[0, 1, 2, 3]])
                TableScan(table=[[TPCH_CN, REGION]], ctx=[0@null], fields=[[0, 
1, 2]])

4. SQL Text :
select /*+ MODEL_PRIORITY(Q8) */ o_year,
 sum(case
 when nation = 'BRAZIL'
 then volume
 else 0
 end) / sum(volume)
 as mkt_share
from
 (
 select year(o_orderdate) as o_year,
 LINEITEM.DISC_PRICE as volume,
 n2.n_name as nation
 from
 tpch_cn.lineitem
 join tpch_cn.part on p_partkey = l_partkey
 join tpch_cn.supplier on s_suppkey = l_suppkey
 join tpch_cn.orders on l_orderkey = o_orderkey
 join tpch_cn.customer on o_custkey = c_custkey
 join tpch_cn.nation n1 on c_nationkey = n1.n_nationkey
 join tpch_cn.nation n2 on s_nationkey = n2.n_nationkey
 join tpch_cn.region on n1.n_regionkey = r_regionkey
 where
 r_name = 'AMERICA'
 and o_orderdate between '1995-01-01' and '1996-12-31'
 and p_type = 'ECONOMY ANODIZED STEEL'
 ) as all_nations
group by
 o_year
order by
 o_year
LIMIT 500

5. Physical plan :
 not exists

<-------------------- Dry Run Info -------------------->
{quote}
h2. Screenshots
h4. Step1 : enable this in project configuration

!KYLIN-5730-01.png!
h4. Step2 : send a query in Insight page

!KYLIN-5730-02.png!
h4. Step3 : Dry-run message in Insight page

!KYLIN-5730-03.png!

 

 


> Query dry-run for better modeling
> ---------------------------------
>
>                 Key: KYLIN-5730
>                 URL: https://issues.apache.org/jira/browse/KYLIN-5730
>             Project: Kylin
>          Issue Type: Improvement
>    Affects Versions: 5.0-beta
>            Reporter: Xiaoxiang Yu
>            Assignee: Xiaoxiang Yu
>            Priority: Major
>             Fix For: 5.0.0
>
>         Attachments: KYLIN-5730-01.png, KYLIN-5730-02.png, KYLIN-5730-03.png
>
>
> h2. Background
> When user enable this feature, the query insight page will display helpful 
> message
> for user to understand why model is not match and what to do in next step.
>  
> Following messages will display some query analytics, including at least:
>  # RelNode Tree
>  # OLAPContext and matched Model for each context
>  # Spark Physical Plan
> Configuration entry is 'kylin.query.dryrun-enabled', at project level.
> h2. How to use
>  # enable this in project configuration
>  # send a query in Insight page
>  # read Dry-run message and fix something and retry
>  
> h4. Dry-run message sample:
> 1. Last Exception :
>   No realization found for \{id = 0, model = not matched, fact table = 
> TPCH_CN.LINEITEM}
>   Incapable message : MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 
> MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 
> MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, MODEL_UNMATCHED_JOIN, 
> 2. OLAPContext(s) and matched model(s) :
>  Ctx=0 is not matched by any model/snapshot, recommend :
>  {
>    "Fact Table" : "TPCH_CN.LINEITEM",
>    "Dimension Tables" : [ "TPCH_CN.REGION", "TPCH_CN.ORDERS", 
> "TPCH_CN.SUPPLIER", "TPCH_CN.PART", "TPCH_CN.CUSTOMER", "TPCH_CN.NATION"],
>    "Query Columns" : [ "TPCH_CN.NATION.N_NAME", "TPCH_CN.ORDERS.O_ORDERDATE", 
> "TPCH_CN.REGION.R_NAME", "TPCH_CN.PART.P_TYPE", 
> "TPCH_CN.LINEITEM.DISC_PRICE"],
>    "Dimension(Group by)" : [ "TPCH_CN.ORDERS.O_ORDERDATE"],
>    "Dimension(Filter cond)" : [ "TPCH_CN.ORDERS.O_ORDERDATE", 
> "TPCH_CN.REGION.R_NAME", "TPCH_CN.PART.P_TYPE"],
>    "Measure" : [ "SUM(UNKNOWN_ALIAS.$F1)", "SUM(T_1_4CD6601C.DISC_PRICE)"],
>    "Join" : "
> Fact: [T_1_4CD6601C:LINEITEM]
>   Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_2_716C1DB8:PART] ON [L_PARTKEY] 
> = [P_PARTKEY]
>   Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_3_6D21031C:SUPPLIER] ON 
> [L_SUPPKEY] = [S_SUPPKEY]
>     Dim: [T_3_6D21031C:SUPPLIER] INNER JOIN [T_7_4F00CD31:NATION] ON 
> [S_NATIONKEY] = [N_NATIONKEY]
>   Dim: [T_1_4CD6601C:LINEITEM] INNER JOIN [T_4_5CEAD9DF:ORDERS] ON 
> [L_ORDERKEY] = [O_ORDERKEY]
>     Dim: [T_4_5CEAD9DF:ORDERS] INNER JOIN [T_5_54B979E7:CUSTOMER] ON 
> [O_CUSTKEY] = [C_CUSTKEY]
>       Dim: [T_5_54B979E7:CUSTOMER] INNER JOIN [T_6_42081A08:NATION] ON 
> [C_NATIONKEY] = [N_NATIONKEY]
>         Dim: [T_6_42081A08:NATION] INNER JOIN [T_8_B14C00A:REGION] ON 
> [N_REGIONKEY] = [R_REGIONKEY]",
>    "Index Id" : 0,
>    "Query Column / Index Column" : "5 / 0",
>    "Index Columns" : []
>  }
> 3. RelNode(with ctx id) :
>   OLAPToEnumerableConverter
>   LimitRel(ctx=[0@null], fetch=[500])
>     SortRel(sort0=[$0], dir0=[ASC-nulls-first], ctx=[0@null])
>       ProjectRel(O_YEAR=[$0], MKT_SHARE=[/($1, $2)], ctx=[0@null])
>         AggregateRel(group-set=[[0]], groups=[null], agg#0=[SUM($1)], 
> agg#1=[SUM($2)], ctx=[0@null])
>           ProjectRel(O_YEAR=[EXTRACT(FLAG(YEAR), $54)], $f1=[CASE(=($72, 
> 'BRAZIL'), $16, 0)], VOLUME=[$16], ctx=[0@null])
>             FilterRel(condition=[AND(=($76, 'AMERICA'), >=($54, 1995-01-01), 
> <=($54, 1996-12-31), =($38, 'ECONOMY ANODIZED STEEL'))], ctx=[0@null])
>               JoinRel(condition=[=($69, $75)], joinType=[inner], ctx=[0@null])
>                 JoinRel(condition=[=($46, $71)], joinType=[inner], 
> ctx=[0@null])
>                   JoinRel(condition=[=($62, $67)], joinType=[inner], 
> ctx=[0@null])
>                     JoinRel(condition=[=($51, $59)], joinType=[inner], 
> ctx=[0@null])
>                       JoinRel(condition=[=($0, $50)], joinType=[inner], 
> ctx=[0@null])
>                         JoinRel(condition=[=($2, $43)], joinType=[inner], 
> ctx=[0@null])
>                           JoinRel(condition=[=($1, $34)], joinType=[inner], 
> ctx=[0@null])
>                             TableScan(table=[[TPCH_CN, LINEITEM]], 
> ctx=[0@null], fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 
> 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33]])
>                             TableScan(table=[[TPCH_CN, PART]], ctx=[0@null], 
> fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8]])
>                           TableScan(table=[[TPCH_CN, SUPPLIER]], 
> ctx=[0@null], fields=[[0, 1, 2, 3, 4, 5, 6]])
>                         TableScan(table=[[TPCH_CN, ORDERS]], ctx=[0@null], 
> fields=[[0, 1, 2, 3, 4, 5, 6, 7, 8]])
>                       TableScan(table=[[TPCH_CN, CUSTOMER]], ctx=[0@null], 
> fields=[[0, 1, 2, 3, 4, 5, 6, 7]])
>                     TableScan(table=[[TPCH_CN, NATION]], ctx=[0@null], 
> fields=[[0, 1, 2, 3]])
>                   TableScan(table=[[TPCH_CN, NATION]], ctx=[0@null], 
> fields=[[0, 1, 2, 3]])
>                 TableScan(table=[[TPCH_CN, REGION]], ctx=[0@null], 
> fields=[[0, 1, 2]])
> 4. SQL Text :
> select /*+ MODEL_PRIORITY(Q8) */ o_year,
>  sum(case
>  when nation = 'BRAZIL'
>  then volume
>  else 0
>  end) / sum(volume)
>  as mkt_share
> from
>  (
>  select year(o_orderdate) as o_year,
>  LINEITEM.DISC_PRICE as volume,
>  n2.n_name as nation
>  from
>  tpch_cn.lineitem
>  join tpch_cn.part on p_partkey = l_partkey
>  join tpch_cn.supplier on s_suppkey = l_suppkey
>  join tpch_cn.orders on l_orderkey = o_orderkey
>  join tpch_cn.customer on o_custkey = c_custkey
>  join tpch_cn.nation n1 on c_nationkey = n1.n_nationkey
>  join tpch_cn.nation n2 on s_nationkey = n2.n_nationkey
>  join tpch_cn.region on n1.n_regionkey = r_regionkey
>  where
>  r_name = 'AMERICA'
>  and o_orderdate between '1995-01-01' and '1996-12-31'
>  and p_type = 'ECONOMY ANODIZED STEEL'
>  ) as all_nations
> group by
>  o_year
> order by
>  o_year
> LIMIT 500
> 5. Physical plan :
>  not exists
> <-------------------- Dry Run Info -------------------->
>  
> h2. Screenshots
> h4. Step1 : enable this in project configuration
> !KYLIN-5730-01.png!
> h4. Step2 : send a query in Insight page
> !KYLIN-5730-02.png!
> h4. Step3 : Dry-run message in Insight page
> !KYLIN-5730-03.png!
>  
>  



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