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@vanzin vanzin commented Apr 17, 2017

This required adding information about StreamBlockId to the UI store,
which is not available yet via the API. So an internal type was added
until there's a need to expose that information in the API.

The UI only lists RDDs that have cached partitions, and that information
wasn't being correctly captured in UIListener, so that's also fixed,
along with some minor (internal) API adjustments so that the UI can
get the correct data.

This required adding information about StreamBlockId to the store,
which is not available yet via the API. So an internal type was added
until there's a need to expose that information in the API.

The UI only lists RDDs that have cached partitions, and that information
wasn't being correctly captured in the listener, so that's also fixed,
along with some minor (internal) API adjustments so that the UI can
get the correct data.
@vanzin vanzin closed this May 30, 2017
vanzin pushed a commit that referenced this pull request Oct 3, 2017
## What changes were proposed in this pull request?

This PR aims to optimize GroupExpressions by removing repeating expressions. `RemoveRepetitionFromGroupExpressions` is added.

**Before**
```scala
scala> sql("select a+1 from values 1,2 T(a) group by a+1, 1+a, A+1, 1+A").explain()
== Physical Plan ==
WholeStageCodegen
:  +- TungstenAggregate(key=[(a#0 + 1)#6,(1 + a#0)#7,(A#0 + 1)#8,(1 + A#0)#9], functions=[], output=[(a + 1)#5])
:     +- INPUT
+- Exchange hashpartitioning((a#0 + 1)#6, (1 + a#0)#7, (A#0 + 1)#8, (1 + A#0)#9, 200), None
   +- WholeStageCodegen
      :  +- TungstenAggregate(key=[(a#0 + 1) AS (a#0 + 1)#6,(1 + a#0) AS (1 + a#0)#7,(A#0 + 1) AS (A#0 + 1)#8,(1 + A#0) AS (1 + A#0)#9], functions=[], output=[(a#0 + 1)#6,(1 + a#0)#7,(A#0 + 1)#8,(1 + A#0)#9])
      :     +- INPUT
      +- LocalTableScan [a#0], [[1],[2]]
```

**After**
```scala
scala> sql("select a+1 from values 1,2 T(a) group by a+1, 1+a, A+1, 1+A").explain()
== Physical Plan ==
WholeStageCodegen
:  +- TungstenAggregate(key=[(a#0 + 1)#6], functions=[], output=[(a + 1)#5])
:     +- INPUT
+- Exchange hashpartitioning((a#0 + 1)#6, 200), None
   +- WholeStageCodegen
      :  +- TungstenAggregate(key=[(a#0 + 1) AS (a#0 + 1)#6], functions=[], output=[(a#0 + 1)#6])
      :     +- INPUT
      +- LocalTableScan [a#0], [[1],[2]]
```

## How was this patch tested?

Pass the Jenkins tests (with a new testcase)

Author: Dongjoon Hyun <[email protected]>

Closes apache#12590 from dongjoon-hyun/SPARK-14830.

(cherry picked from commit 6e63201)
Signed-off-by: Michael Armbrust <[email protected]>
vanzin pushed a commit that referenced this pull request Jan 2, 2020
### Why are the changes needed?
`EnsureRequirements` adds `ShuffleExchangeExec` (RangePartitioning) after Sort if `RoundRobinPartitioning` behinds it. This will cause 2 shuffles, and the number of partitions in the final stage is not the number specified by `RoundRobinPartitioning.

**Example SQL**
```
SELECT /*+ REPARTITION(5) */ * FROM test ORDER BY a
```

**BEFORE**
```
== Physical Plan ==
*(1) Sort [a#0 ASC NULLS FIRST], true, 0
+- Exchange rangepartitioning(a#0 ASC NULLS FIRST, 200), true, [id=#11]
   +- Exchange RoundRobinPartitioning(5), false, [id=#9]
      +- Scan hive default.test [a#0, b#1], HiveTableRelation `default`.`test`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [a#0, b#1]
```

**AFTER**
```
== Physical Plan ==
*(1) Sort [a#0 ASC NULLS FIRST], true, 0
+- Exchange rangepartitioning(a#0 ASC NULLS FIRST, 5), true, [id=#11]
   +- Scan hive default.test [a#0, b#1], HiveTableRelation `default`.`test`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [a#0, b#1]
```

### Does this PR introduce any user-facing change?
No

### How was this patch tested?
Run suite Tests and add new test for this.

Closes apache#26946 from stczwd/RoundRobinPartitioning.

Lead-authored-by: lijunqing <[email protected]>
Co-authored-by: stczwd <[email protected]>
Signed-off-by: Wenchen Fan <[email protected]>
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