GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/11503
[SPARK-12721] [SQL] SQL Generation for Script Transformation
#### What changes were proposed in this pull request?
This PR is to convert to SQL from analyzed logical plans containing
operator `ScriptTransformation`.
For example, below is the SQL containing `Transform`
```
SELECT TRANSFORM (a, b, c, d) USING 'cat' FROM parquet_t2
```
Its logical plan is like
```
ScriptTransformation [a#210L,b#211L,c#212L,d#213L], cat,
[key#208,value#209],
HiveScriptIOSchema(List(),List(),Some(org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe),Some(org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe),List((field.delim,
)),List((field.delim,
)),Some(org.apache.hadoop.hive.ql.exec.TextRecordReader),Some(org.apache.hadoop.hive.ql.exec.TextRecordWriter),true)
+- SubqueryAlias parquet_t2
+- Relation[a#210L,b#211L,c#212L,d#213L] ParquetRelation
```
The generated SQL will be like
```
SELECT TRANSFORM (`parquet_t2`.`a`, `parquet_t2`.`b`, `parquet_t2`.`c`,
`parquet_t2`.`d`) USING 'cat' AS (`key` string, `value` string) FROM
`default`.`parquet_t2`
```
## How was this patch tested?
Seven test cases are added to `LogicalPlanToSQLSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark transformToSQL
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11503.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 #11503
----
commit a39def82e2ad09c1c311e9ca062d7ac16304eee5
Author: gatorsmile <[email protected]>
Date: 2016-03-03T23:52:01Z
SQL generation for script transformation
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