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https://issues.apache.org/jira/browse/PHOENIX-3355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15655627#comment-15655627
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ASF GitHub Bot commented on PHOENIX-3355:
-----------------------------------------
Github user maryannxue commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/222#discussion_r87512188
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/calcite/PhoenixScalarFunction.java
---
@@ -90,6 +153,10 @@ public PFunction getFunctionInfo() {
return functionInfo;
}
+ public FunctionParseNode.BuiltInFunctionInfo getParseInfo(){
--- End diff --
So here maybe all we need is the exact FunctionExpression class. In case of
abstract function class, we need some additional information in
BuiltinFunctionInfo. So I'm thinking to add annotation for those derived
function expression classes, e.g. RoundDateFunction as well. And in order to
let the standalone Phoenix function map not to add the derived signatures and
meanwhile to make sure that calcite-phoenix's function map will not have the
abstract function classes, we can add one more attribute to BuiltinFunction as:
{code}
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public
@interface Argument {
Class<? extends PDataType>[] allowedTypes() default {};
boolean isConstant() default false;
String defaultValue() default "";
String enumeration() default "";
String minValue() default "";
String maxValue() default "";
FunctionClassType classType() default FunctionClassType.NONE;
}
public enum FunctionClassType {
NONE,
ABSTRACT,
DERIVED,
}
{code}
Thus in CalciteUtils, we'll use reflection to get the function constructor,
either with or without StatementContext, depending on each individual function,
and instantiate the instance.
> Register Phoenix built-in functions as Calcite functions
> --------------------------------------------------------
>
> Key: PHOENIX-3355
> URL: https://issues.apache.org/jira/browse/PHOENIX-3355
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Assignee: Eric Lomore
> Labels: calcite
> Attachments: PHOENIX-3355.function_constructor.patch,
> PHOENIX-3355.wip, PHOENIX-3355.wip2
>
>
> We should register all Phoenix built-in functions that don't exist in Calcite.
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