GitHub user chenghao-intel opened a pull request:
https://github.com/apache/spark/pull/8494
[SPARK-10327][SQL] Cache Table is not working while subquery has alias in
its project list
```scala
import org.apache.spark.sql.hive.execution.HiveTableScan
sql("select key, value, key + 1 from src").registerTempTable("abc")
cacheTable("abc")
val sparkPlan = sql(
"""select a.key, b.key, c.key from
|abc a join abc b on a.key=b.key
|join abc c on a.key=c.key""".stripMargin).queryExecution.sparkPlan
assert(sparkPlan.collect { case e: InMemoryColumnarTableScan => e
}.size === 3) // failed
assert(sparkPlan.collect { case e: HiveTableScan => e }.size === 0) //
failed
```
The actual plan is:
```
== Parsed Logical Plan ==
'Project
[unresolvedalias('a.key),unresolvedalias('b.key),unresolvedalias('c.key)]
'Join Inner, Some(('a.key = 'c.key))
'Join Inner, Some(('a.key = 'b.key))
'UnresolvedRelation [abc], Some(a)
'UnresolvedRelation [abc], Some(b)
'UnresolvedRelation [abc], Some(c)
== Analyzed Logical Plan ==
key: int, key: int, key: int
Project [key#14,key#61,key#66]
Join Inner, Some((key#14 = key#66))
Join Inner, Some((key#14 = key#61))
Subquery a
Subquery abc
Project [key#14,value#15,(key#14 + 1) AS _c2#16]
MetastoreRelation default, src, None
Subquery b
Subquery abc
Project [key#61,value#62,(key#61 + 1) AS _c2#58]
MetastoreRelation default, src, None
Subquery c
Subquery abc
Project [key#66,value#67,(key#66 + 1) AS _c2#63]
MetastoreRelation default, src, None
== Optimized Logical Plan ==
Project [key#14,key#61,key#66]
Join Inner, Some((key#14 = key#66))
Project [key#14,key#61]
Join Inner, Some((key#14 = key#61))
Project [key#14]
InMemoryRelation [key#14,value#15,_c2#16], true, 10000,
StorageLevel(true, true, false, true, 1), (Project [key#14,value#15,(key#14 +
1) AS _c2#16]), Some(abc)
Project [key#61]
MetastoreRelation default, src, None
Project [key#66]
MetastoreRelation default, src, None
== Physical Plan ==
TungstenProject [key#14,key#61,key#66]
BroadcastHashJoin [key#14], [key#66], BuildRight
TungstenProject [key#14,key#61]
BroadcastHashJoin [key#14], [key#61], BuildRight
ConvertToUnsafe
InMemoryColumnarTableScan [key#14], (InMemoryRelation
[key#14,value#15,_c2#16], true, 10000, StorageLevel(true, true, false, true,
1), (Project [key#14,value#15,(key#14 + 1) AS _c2#16]), Some(abc))
ConvertToUnsafe
HiveTableScan [key#61], (MetastoreRelation default, src, None)
ConvertToUnsafe
HiveTableScan [key#66], (MetastoreRelation default, src, None)
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chenghao-intel/spark weird_cache
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8494.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #8494
----
commit bfd40d999b6530bc04fc03ea6591c0093e10e534
Author: Cheng Hao <[email protected]>
Date: 2015-08-28T02:41:56Z
Cache Table is not working while subquery has alias in its project list
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