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https://issues.apache.org/jira/browse/FLINK-18030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17123486#comment-17123486
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Danny Chen commented on FLINK-18030:
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cc [~lzljs3620320]
> Hive UDF doesn't accept empty string literal parameter
> ------------------------------------------------------
>
> Key: FLINK-18030
> URL: https://issues.apache.org/jira/browse/FLINK-18030
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Hive
> Reporter: Rui Li
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.11.0
>
>
> Empty string literal parameters are considered to be of type {{CHAR(0)}},
> which is not supported in Hive. Therefore calling functions like
> {{REGEXP_REPLACE('abcd', 'a', '')}} would fail with exception:
> {noformat}
> Caused by: java.lang.RuntimeException: Char length 0 out of allowed range [1,
> 255]
> at
> org.apache.hadoop.hive.serde2.typeinfo.BaseCharUtils.validateCharParameter(BaseCharUtils.java:39)
> at org.apache.hadoop.hive.serde2.typeinfo.CharTypeInfo.(CharTypeInfo.java:33)
> at
> org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory.createPrimitiveTypeInfo(TypeInfoFactory.java:146)
> at
> org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory.getPrimitiveTypeInfo(TypeInfoFactory.java:109)
> at
> org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory.getCharTypeInfo(TypeInfoFactory.java:165)
> at
> org.apache.flink.table.catalog.hive.util.HiveTypeUtil$TypeInfoLogicalTypeVisitor.visit(HiveTypeUtil.java:191)
> at
> org.apache.flink.table.catalog.hive.util.HiveTypeUtil$TypeInfoLogicalTypeVisitor.visit(HiveTypeUtil.java:173)
> at org.apache.flink.table.types.logical.CharType.accept(CharType.java:149)
> at
> org.apache.flink.table.catalog.hive.util.HiveTypeUtil.toHiveTypeInfo(HiveTypeUtil.java:84)
> at
> org.apache.flink.table.functions.hive.HiveSimpleUDF.getHiveResultType(HiveSimpleUDF.java:127)
> ... 67 more
> {noformat}
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