[jira] [Created] (SPARK-14747) Add assertStreaming/assertNoneStreaming checks in DataFrameWriter

["Liwei Lin (JIRA)" <ji...@apache.org>]

Liwei Lin created SPARK-14747:
---------------------------------

             Summary: Add assertStreaming/assertNoneStreaming checks in DataFrameWriter
                 Key: SPARK-14747
                 URL: https://issues.apache.org/jira/browse/SPARK-14747
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Liwei Lin
            Priority: Minor


If an end user happens to write the code mixed with continuous-query-oriented methods and non-continuous-query-oriented methods:

{code}
ctx.read
   .format("text")
   .stream("...")  // continuous query
   .write
   .text("...")    // non-continuous query
{code}

He/she would get somehow a confusing exception:

{quote}
Exception in thread "main" java.lang.AssertionError: assertion failed: No plan for FileSource\[./continuous_query_test_input\]
	at scala.Predef$.assert(Predef.scala:170)
	at org.apache.spark.sql.catalyst.planning.QueryPlanner.plan(QueryPlanner.scala:59)
	at org.apache.spark.sql.catalyst.planning.QueryPlanner.planLater(QueryPlanner.scala:54)
	at ...
{quote}

This JIRA proposes to add checks for continuous-query-oriented methods and non-continuous-query-oriented methods in `DataFrameWriter`.



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