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https://issues.apache.org/jira/browse/FLINK-10263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16622274#comment-16622274
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ASF GitHub Bot commented on FLINK-10263:
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twalthr opened a new pull request #6725: [FLINK-10263] [sql-client] Fix
classloader issues in SQL Client
URL: https://github.com/apache/flink/pull/6725
## What is the purpose of the change
Fixes classloading issues when using a UDF with constant parameters. Every
optimization might need to compile code (i.e. for constant folding), thus,
needs access to the user-code classloader.
## Brief change log
Set SQL Client's execution context class loader as thread classloader and
use it for constant folding.
## Verifying this change
End-to-end test has been extended.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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> User-defined function with LITERAL paramters yields CompileException
> --------------------------------------------------------------------
>
> Key: FLINK-10263
> URL: https://issues.apache.org/jira/browse/FLINK-10263
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.7.0
> Reporter: Fabian Hueske
> Assignee: Timo Walther
> Priority: Major
> Labels: pull-request-available
>
> When using a user-defined scalar function only with literal parameters, a
> {{CompileException}} is thrown. For example
> {code}
> SELECT myFunc(CAST(40.750444 AS FLOAT), CAST(-73.993475 AS FLOAT))
> public class MyFunc extends ScalarFunction {
> public int eval(float lon, float lat) {
> // do something
> }
> }
> {code}
> results in
> {code}
> [ERROR] Could not execute SQL statement. Reason:
> org.codehaus.commons.compiler.CompileException: Line 5, Column 10: Cannot
> determine simple type name "com"
> {code}
> The problem is probably caused by the expression reducer because it
> disappears if a regular attribute is added to a parameter expression.
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