GitHub user chenghao-intel opened a pull request:
https://github.com/apache/spark/pull/7980
[SPARK-6212][SQL] Fix bug of explain CTAS
As we assume the `CreateTableAsSelect` is the leaf node, so it breaks the
transformation rules applied recursively, while we do the `explain` command.
To execute the explain for CTAS like:
```sql
explain extended create table temp__b as select key, 1+4 from src limit 2;
```
W/o this PR:
```
== Parsed Logical Plan ==
'CreateTableAsSelect
HiveTable(None,temp__b,List(),List(),Map(),Map(),ManagedTable,None,Some(org.apache.hadoop.mapred.TextInputFormat),Some(org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat),None,None),
false
'Limit 2
'Project [unresolvedalias('key),unresolvedalias((1 + 4))]
'UnresolvedRelation [src], None
== Analyzed Logical Plan ==
CreateTableAsSelect [Database:default, TableName: temp__b,
InsertIntoHiveTable]
Limit 2
Project [key#1,(1 + 4) AS _c1#3]
MetastoreRelation default, src, None
== Optimized Logical Plan ==
CreateTableAsSelect [Database:default, TableName: temp__b,
InsertIntoHiveTable]
Limit 2
Project [key#1,(1 + 4) AS _c1#3]
MetastoreRelation default, src, None
== Physical Plan ==
ExecutedCommand (CreateTableAsSelect [Database:default, TableName: temp__b,
InsertIntoHiveTable]
Limit 2
Project [key#1,(1 + 4) AS _c1#3]
MetastoreRelation default, src, None)
Code Generation: true
== RDD ==
```
W/ this PR:
```
== Parsed Logical Plan ==
'CreateTableAsSelect
HiveTable(None,temp__b,List(),List(),Map(),Map(),ManagedTable,None,Some(org.apache.hadoop.mapred.TextInputFormat),Some(org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat),None,None),
false
'Limit 2
'Project [unresolvedalias('key),unresolvedalias((1 + 4))]
'UnresolvedRelation [src], None
== Analyzed Logical Plan ==
CreateTableAsSelect [AllowExisting: false, HiveTable:
HiveTable(Some(default),temp__b,List(),List(),Map(),Map(),ManagedTable,None,Some(org.apache.hadoop.mapred.TextInputFormat),Some(org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat),Some(org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe),None)]
Limit 2
Project [key#1,(1 + 4) AS _c1#3]
MetastoreRelation default, src, None
== Optimized Logical Plan ==
CreateTableAsSelect [AllowExisting: false, HiveTable:
HiveTable(Some(default),temp__b,List(),List(),Map(),Map(),ManagedTable,None,Some(org.apache.hadoop.mapred.TextInputFormat),Some(org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat),Some(org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe),None)]
Limit 2
Project [key#1,5 AS _c1#3]
MetastoreRelation default, src, None
== Physical Plan ==
ExecutedCommand [cmd:CreateTableAsSelect [AllowExisting: false, HiveTable:
HiveTable(Some(default),temp__b,List(),List(),Map(),Map(),ManagedTable,None,Some(org.apache.hadoop.mapred.TextInputFormat),Some(org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat),Some(org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe),None)]
Limit 2
Project [key#1,5 AS _c1#3]
MetastoreRelation default, src, None
]
Code Generation: true
== RDD ==
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chenghao-intel/spark SPARK-6212
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/7980.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 #7980
----
commit f6961e59c2975dff2ca6fc9cab9bcd175113639f
Author: Cheng Hao <[email protected]>
Date: 2015-08-05T14:45:06Z
fix bug of explain CTAS
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