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https://issues.apache.org/jira/browse/FLINK-9294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rong Rong updated FLINK-9294:
-----------------------------
Description:
Most of the UDF function signatures that includes composite types such as
*{{MAP}}*, *{{ARRAY}}*, etc would require user to override
*{{getParameterType}}* or *{{getResultType}}* method explicitly.
It should be able to resolve the composite type based on the function
signature, such as:
{code:java}
public String[] eval(Map<String, Integer> mapArg) { /* ... */ }
{code}
should either
1. Automatically resolve that:
- *{{ObjectArrayTypeInfo<BasicTypeInfo.STRING>}}* to be the result type.
- *{{MapTypeInfo<BasicTypeInfo.STRING, BasicTypeInfo.INTEGER>}}* to be the
parameter type.
2. Improved function mapping to find and locate function with such signatures.
was:
Most of the UDF function signatures that includes composite types such as
*{{MAP}}*, *{{ARRAY}}*, etc would require user to override
*{{getParameterType}}* or *{{getResultType}}* method explicitly.
It should be able to resolve the composite type based on the function
signature, such as:
{code:java}
public String[] eval(Map<String, Integer> mapArg) {
//...
}
{code}
should either
1. Automatically resolve that:
- *{{ObjectArrayTypeInfo<BasicTypeInfo.STRING>}}* to be the result type.
- *{{MapTypeInfo<BasicTypeInfo.STRING, BasicTypeInfo.INTEGER>}}* to be the
parameter type.
2. Improved function mapping to find and locate function with such signatures.
> Improve type inference for UDFs with composite parameter or result type
> ------------------------------------------------------------------------
>
> Key: FLINK-9294
> URL: https://issues.apache.org/jira/browse/FLINK-9294
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Rong Rong
> Assignee: Rong Rong
> Priority: Major
>
> Most of the UDF function signatures that includes composite types such as
> *{{MAP}}*, *{{ARRAY}}*, etc would require user to override
> *{{getParameterType}}* or *{{getResultType}}* method explicitly.
> It should be able to resolve the composite type based on the function
> signature, such as:
> {code:java}
> public String[] eval(Map<String, Integer> mapArg) { /* ... */ }
> {code}
> should either
> 1. Automatically resolve that:
> - *{{ObjectArrayTypeInfo<BasicTypeInfo.STRING>}}* to be the result type.
> - *{{MapTypeInfo<BasicTypeInfo.STRING, BasicTypeInfo.INTEGER>}}* to be the
> parameter type.
> 2. Improved function mapping to find and locate function with such signatures.
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