[jira] [Created] (ORC-688) Allow CHAR, VARCHAR to be promoted to STRING

["Shardul Mahadik (Jira)" <ji...@apache.org>]

Shardul Mahadik created ORC-688:
-----------------------------------

             Summary: Allow CHAR, VARCHAR to be promoted to STRING
                 Key: ORC-688
                 URL: https://issues.apache.org/jira/browse/ORC-688
             Project: ORC
          Issue Type: Wish
            Reporter: Shardul Mahadik


E.g. For the evolution File type {{struct<x:char(10)>}} Reader type {{struct<x:string>}}
we currently get the following error
{code}

java.lang.IllegalArgumentException: No conversion of type STRING to self needed

	at org.apache.orc.impl.ConvertTreeReaderFactory.createStringConvertTreeReader(ConvertTreeReaderFactory.java:1954)
	at org.apache.orc.impl.ConvertTreeReaderFactory.createConvertTreeReader(ConvertTreeReaderFactory.java:2267)
	at org.apache.orc.impl.TreeReaderFactory.createTreeReader(TreeReaderFactory.java:2804)
	at org.apache.orc.impl.TreeReaderFactory$StructTreeReader.<init>(TreeReaderFactory.java:2420)
	at org.apache.orc.impl.TreeReaderFactory.createTreeReader(TreeReaderFactory.java:2844)
	at org.apache.orc.impl.TreeReaderFactory.createRootReader(TreeReaderFactory.java:2859)
{code}

Should we allow such an evolution?



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