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https://issues.apache.org/jira/browse/FLINK-32188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17726203#comment-17726203
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Xin Chen commented on FLINK-32188:
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I also explore why lookupFunction returned Option.empty：
Its internal call chain：
{code:java}
1、Try(functionCatalog.lookupFunction(identifier))---->
2、resolveAmbiguousFunctionReference(identifier.getObjectName())---->
3、Optional<FunctionDefinition> candidate =
moduleManager.getFunctionDefinition(normalizedName)---->
4、modules.get(moduleName).listFunctions().stream().anyMatch(name::equalsIgnoreCase)
{code}
Empty is returned here because it cannot find
‘FunctionDefinition：ARRAY_VALUE_CONSTRUCTOR’ from loaded module: core.
!screenshot-3.png!
!screenshot-4.png!
!screenshot-5.png!
!screenshot-6.png!
> Does the custom connector not support pushing down "where" query predicates
> to query fields of array type？
> ----------------------------------------------------------------------------------------------------------
>
> Key: FLINK-32188
> URL: https://issues.apache.org/jira/browse/FLINK-32188
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.12.2, 1.17.0, 1.16.1
> Reporter: Xin Chen
> Priority: Major
> Attachments: image-2023-05-25-17-16-02-288.png, screenshot-1.png,
> screenshot-2.png, screenshot-3.png, screenshot-4.png, screenshot-5.png,
> screenshot-6.png
>
>
> When I customized a data source connector which assumed as image-connector, I
> found that when creating a table with ddl, I specified a field URL as an
> array type. When submitting an SQL task with Flink, I specified query this
> field as a fixed array. For example, select * from image source where
> URL=ARRAY ['/flink. jpg', '/flink_1. jpg'], but it couldn't obtain the
> corresponding predicate filters at all.
> Does the custom connector not support to query fields of array type with
> "where"？
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