misc: Add lookup cast in standard function resolution

[feilong-liu]

Description

cast function is special as it needs to specify both input and output types, hence cannot use the existing lookupBuiltInFunction API. Add the lookupCast API in this PR

Motivation and Context

See description

Impact

See description

Test Plan

Unit test

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== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR adds a dedicated lookupCast API to the SQL function resolution layer, enabling explicit resolution of cast functions by input and output types, and updates unit tests to verify its behavior.

Class diagram for updated StandardFunctionResolution interface and FunctionResolution implementation

classDiagram
class StandardFunctionResolution {
  +boolean isCastFunction(FunctionHandle functionHandle)
  +FunctionHandle lookupCast(String castType, Type fromType, Type toType)
  +boolean isCountFunction(FunctionHandle functionHandle)
  +boolean isCountIfFunction(FunctionHandle functionHandle)
}
class FunctionResolution {
  +boolean isCastFunction(FunctionHandle functionHandle)
  +FunctionHandle lookupCast(String castType, Type fromType, Type toType)
  +boolean isTryCastFunction(FunctionHandle functionHandle)
}
StandardFunctionResolution <|.. FunctionResolution
FunctionResolution --> functionAndTypeResolver: uses
functionAndTypeResolver : lookupCast(castType, fromType, toType)
functionAndTypeResolver : getFunctionMetadata(functionHandle)

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File-Level Changes

Change	Details	Files
Add lookupCast API to resolve cast functions requiring explicit input and output types	Declare lookupCast in StandardFunctionResolution interface Implement lookupCast delegation to functionAndTypeResolver in FunctionResolution Maintain existing lookupBuiltInFunction behavior for non-cast functions	presto-spi/src/main/java/com/facebook/presto/spi/function/StandardFunctionResolution.java presto-main-base/src/main/java/com/facebook/presto/sql/relational/FunctionResolution.java
Extend unit tests to cover lookupCast and isCastFunction	Add assertion that lookupCast returns a valid cast FunctionHandle Verify isCastFunction recognizes the returned handle	presto-main-base/src/test/java/com/facebook/presto/sql/relational/TestFunctionResolution.java

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• The new SPI method lookupCast should either have a default implementation or be added to all existing implementations to avoid breaking backwards compatibility.
• Rather than passing a raw string for the cast function name, consider using a QualifiedObjectName or enum to enforce type safety and prevent typos in the lookupCast API.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The new SPI method lookupCast should either have a default implementation or be added to all existing implementations to avoid breaking backwards compatibility.
- Rather than passing a raw string for the cast function name, consider using a QualifiedObjectName or enum to enforce type safety and prevent typos in the lookupCast API.

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[hantangwangd]

LGTM!