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https://issues.apache.org/jira/browse/PIG-904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788765#action_12788765
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Jeff Zhang commented on PIG-904:
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I think this problem is caused by the following code in TypeCheckingVisitor
{code}
static{
//Ordering here decides the score for the best fit function.
//Do not change the order. Conversions to a smaller type is preferred
//over conversion to a bigger type where ordering of types is:
//INTEGER, LONG, FLOAT, DOUBLE, CHARARRAY, TUPLE, BAG, MAP
//from small to big
// castLookup.put(DataType.BOOLEAN, DataType.INTEGER);
// castLookup.put(DataType.BOOLEAN, DataType.LONG);
// castLookup.put(DataType.BOOLEAN, DataType.FLOAT);
// castLookup.put(DataType.BOOLEAN, DataType.DOUBLE);
// castLookup.put(DataType.BOOLEAN, DataType.CHARARRAY);
castLookup.put(DataType.INTEGER, DataType.LONG);
castLookup.put(DataType.INTEGER, DataType.FLOAT);
castLookup.put(DataType.INTEGER, DataType.DOUBLE);
// castLookup.put(DataType.INTEGER, DataType.CHARARRAY);
castLookup.put(DataType.LONG, DataType.FLOAT);
castLookup.put(DataType.LONG, DataType.DOUBLE);
// castLookup.put(DataType.LONG, DataType.CHARARRAY);
castLookup.put(DataType.FLOAT, DataType.DOUBLE);
// castLookup.put(DataType.FLOAT, DataType.CHARARRAY);
// castLookup.put(DataType.DOUBLE, DataType.CHARARRAY);
// castLookup.put(DataType.BYTEARRAY, DataType.BOOLEAN);
castLookup.put(DataType.BYTEARRAY, DataType.INTEGER);
castLookup.put(DataType.BYTEARRAY, DataType.LONG);
castLookup.put(DataType.BYTEARRAY, DataType.FLOAT);
castLookup.put(DataType.BYTEARRAY, DataType.DOUBLE);
castLookup.put(DataType.BYTEARRAY, DataType.CHARARRAY);
castLookup.put(DataType.BYTEARRAY, DataType.TUPLE);
castLookup.put(DataType.BYTEARRAY, DataType.BAG);
castLookup.put(DataType.BYTEARRAY, DataType.MAP);
}
{code}
If I comment the "castLookup.put(DataType.DOUBLE, DataType.CHARARRAY);", the
script above will pass.
I do not know clearly why some cast operation is commented, in my opinion, the
following cast should been supported:
castLookup.put(DataType.BOOLEAN, DataType.CHARARRAY);
castLookup.put(DataType.INTEGER, DataType.CHARARRAY);
castLookup.put(DataType.LONG, DataType.CHARARRAY);
castLookup.put(DataType.FLOAT, DataType.CHARARRAY);
> Conversion from double to chararray for udf input arguments does not occur
> --------------------------------------------------------------------------
>
> Key: PIG-904
> URL: https://issues.apache.org/jira/browse/PIG-904
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.3.1
> Reporter: Pradeep Kamath
>
> Script showing the problem:
> {noformat}
> "a = load '/user/pig/tests/data/singlefile/studenttab10k' as (name, age,
> gpa:double); b = foreach a generate CONCAT(gpa, 'dummy'); dump b;"
> Error shown:
> 2009-08-03 17:04:27,573 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 1045: Could not infer the matching function for org.apache.pig.builtin.CONCAT
> as multiple or none of them fit. Please use an explicit cast.
> {noformat}
> The error goes away if gpa is casted to chararray.
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