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https://issues.apache.org/jira/browse/HIVE-7160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14092991#comment-14092991
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Ashutosh Chauhan commented on HIVE-7160:
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I think design issue here is one raised in HIVE-7632 {{Vectorizer}} currently
inserts casts and than evaluates it so that types of all operands match for
UDF. It does so because currently Hive doesnt upcast operands while it does
semantic checking and leave this to runtime where it is achieved, mainly via
the logic in {{GenericUDFBaseNumeric}} Instead of delegating type casting to
runtime, this should happen at compile time, when we are doing type checking
and should upcast operands as necessary. Once we do this in
{{TypeCheckProcFactory}} there will be no need to insert and evaluate cast
later in compilation (like vectorizer) or runtime (GenericUDFOpNumeric)
> Vectorization Udf: GenericUDFConcat for non-string columns input, is not
> supported
> ----------------------------------------------------------------------------------
>
> Key: HIVE-7160
> URL: https://issues.apache.org/jira/browse/HIVE-7160
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.14.0
> Reporter: Gopal V
> Assignee: Navis
> Priority: Minor
> Attachments: HIVE-7160.1.patch.txt
>
>
> simple UDF missing vectorization - simple example would be
> hive> explain select concat( l_orderkey, ' msecs') from lineitem;
> is not vectorized while
> hive> explain select concat(cast(l_orderkey as string), ' msecs') from
> lineitem;
> can be vectorized.
> {code}
> 14/05/31 15:28:59 [main]: DEBUG vector.VectorizationContext: No vector udf
> found for GenericUDFConcat, descriptor: Argument Count = 2, mode =
> PROJECTION, Argument Types = {LONG, STRING}, Input Expression Types =
> {COLUMN,COLUMN}
> 14/05/31 15:28:59 [main]: DEBUG physical.Vectorizer: Failed to vectorize
> org.apache.hadoop.hive.ql.metadata.HiveException: Udf: GenericUDFConcat, is
> not supported
> at
> org.apache.hadoop.hive.ql.exec.vector.VectorizationContext.getGenericUdfVectorExpression(VectorizationContext.java:918)
> {code}
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