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https://issues.apache.org/jira/browse/CALCITE-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822403#comment-16822403
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pengzhiwei edited comment on CALCITE-3000 at 4/20/19 9:52 AM:
--------------------------------------------------------------
Hi [~julianhyde], the description of the issue has been updated and a PR has
pulled.
Here is the mainly change list in this PR:
# Add {{SqlUtil#findBestMatchMethod}} to support find best matched method in
the function class.
# Support dynamic type inference according to the calling argument types based
on (1).({{SqlFunction#getReturnTypeInferenceForClass}}、
{{SqlFunction#getOperandTypeInferenceForClass }} and
{{SqlFunction#getOperandTypeCheckerForClass}})
# Add {{argTypes}} and {{typeFactory}} parameters to
{{ImplementableFunction#getImplementor}} to create {{CallImplementor}}
according to the argument types.
# Add {{argTypes}} and {{typeFactory}} parameters to
{{TableFunction#getRowType}} to infer return type according to the argument
types.
# Add {{JavaScalarFunction}} and {{JavaTableFunction}} to represent the
class-level function schema mapping a java class.
was (Author: pzw2018):
Hi [~julianhyde], the description of the issue has been updated and a PR has
pulled.
Here is the mainly change list in this PR:
# Add {{SqlUtil#findBestMatchMethod}} to support find best matched method in
the function class.
# Support dynamic type inference according to the calling argument types based
on (1).({{SqlFunction#getReturnTypeInferenceForClass}}、
{{SqlFunction#getOperandTypeInferenceForClass }} and
{{SqlFunction#getOperandTypeCheckerForClass}})
# Add {{argTypes}} and {{typeFactory}} parameters to
{{ImplementableFunction#getImplementor}} to create {{CallImplementor}}
according to the argument types.
# Add {{argTypes}} and {{typeFactory}} parameters to
{{TableFunction#getRowType}} to infer return type according to the argument
types.
# Add {{JavaScalarFunction}} and {{JavaTableFunction}} to represent the
function schema mapping a java class.
> Improve SqlUserDefinedFunction and SqlUserDefinedTableFunction to support
> overload method call
> ----------------------------------------------------------------------------------------------
>
> Key: CALCITE-3000
> URL: https://issues.apache.org/jira/browse/CALCITE-3000
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: pengzhiwei
> Assignee: pengzhiwei
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Here are User-defined scalar function class and table function class:
>
> {code:java}
> @UDFDescription(name = "MY_UDF", category =
> SqlFunctionCategory.USER_DEFINED_FUNCTION)
> public static class MyUdfFunction {
> public static String eval(String a) {
> ...
> }
> public static String eval(String a, String b) {
> ....
> }
> public static String eval(String a, int c) {
> ....
> }
> }
> {code}
> {code:java}
> @UDFDescription(name = "MY_UDTF", category =
> SqlFunctionCategory.USER_DEFINED_TABLE_FUNCTION)
> public static class MyUdtfFunction {
> public static MyScannableTable eval(String a) {
> ...
> }
> public static MyScannableTable eval(long a) {
> ...
> }
> public static MyScannableTable eval(int a) {
> ...
> }
> }
> {code}
> This issue wants to improve the SqlUserDefinedFunction and
> SqlUserDefinedTableFunction to support the overload functions in both
> User-defined scalar function class and table function class.
>
>
>
>
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