[jira] [Created] (SPARK-5603) Preinsert casting and renaming rule is needed in the Analyzer

["Yin Huai (JIRA)" <ji...@apache.org>]

Yin Huai created SPARK-5603:
-------------------------------

             Summary: Preinsert casting and renaming rule is needed in the Analyzer
                 Key: SPARK-5603
                 URL: https://issues.apache.org/jira/browse/SPARK-5603
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
            Reporter: Yin Huai
            Priority: Blocker


For an INSERT INTO/OVERWRITE statement, we should add necessary Cast and Alias to the output of the query.

{code}
CREATE TEMPORARY TABLE jsonTable (a int, b string)
USING org.apache.spark.sql.json.DefaultSource
OPTIONS (
  path '...'
)
INSERT OVERWRITE TABLE jsonTable SELECT a * 2, a * 4 FROM table
{code}
For a*2, we should create an Alias, so the InsertableRelation can know it is the column a. For a*4, it is actually the column b in jsonTable. We should first cast it to StringType and add an Alias b to it.



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