[ 
https://issues.apache.org/jira/browse/CALCITE-4834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Ruben Q L updated CALCITE-4834:
-------------------------------
    Description: 
This seems caused by CALCITE-4546 
([fbbdf46|https://github.com/apache/calcite/commit/fbbdf465df46b4e6f9863d7d1dfdcb19a43f2032])

{{JaninoRelMetadataProvider}} lines 135 & 141 is using (for the generated code) 
the hardcoded name of the class {{MetadataDef}}:
{code}
buff.append("  private final org.apache.calcite.rel.metadata.MetadataDef 
def;\n");
for (Map.Entry<MetadataHandler<?>, String> handlerAndName : 
handlerToName.entrySet()) {
  ...
  .append("      org.apache.calcite.rel.metadata.MetadataDef def");
{code}

This can lead to issues (e.g. if a downstream project shades Calcite library). 
The safer way to do this is using {{Class#getName}}, as it is already done in 
the rest of the code, e.g. in {{JaninoRelMetadataProvider:158}}:
{code}
.append(MetadataDef.class.getName())
{code}

  was:
This seems caused by CALCITE-4546.

{{JaninoRelMetadataProvider}} lines 135 & 141 is using (for the generated code) 
the hardcoded name of the class {{MetadataDef}}:
{code}
buff.append("  private final org.apache.calcite.rel.metadata.MetadataDef 
def;\n");
for (Map.Entry<MetadataHandler<?>, String> handlerAndName : 
handlerToName.entrySet()) {
  ...
  .append("      org.apache.calcite.rel.metadata.MetadataDef def");
{code}

This can lead to issues (e.g. if a downstream project shades Calcite library). 
The safer way to do this is using {{Class#getName}}, as it is already done in 
the rest of the code, e.g. in {{JaninoRelMetadataProvider:158}}:
{code}
.append(MetadataDef.class.getName())
{code}


> JaninoRelMetadataProvider uses hardcoded class name
> ---------------------------------------------------
>
>                 Key: CALCITE-4834
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4834
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Ruben Q L
>            Assignee: Ruben Q L
>            Priority: Major
>             Fix For: 1.28.0
>
>
> This seems caused by CALCITE-4546 
> ([fbbdf46|https://github.com/apache/calcite/commit/fbbdf465df46b4e6f9863d7d1dfdcb19a43f2032])
> {{JaninoRelMetadataProvider}} lines 135 & 141 is using (for the generated 
> code) the hardcoded name of the class {{MetadataDef}}:
> {code}
> buff.append("  private final org.apache.calcite.rel.metadata.MetadataDef 
> def;\n");
> for (Map.Entry<MetadataHandler<?>, String> handlerAndName : 
> handlerToName.entrySet()) {
>   ...
>   .append("      org.apache.calcite.rel.metadata.MetadataDef def");
> {code}
> This can lead to issues (e.g. if a downstream project shades Calcite 
> library). The safer way to do this is using {{Class#getName}}, as it is 
> already done in the rest of the code, e.g. in 
> {{JaninoRelMetadataProvider:158}}:
> {code}
> .append(MetadataDef.class.getName())
> {code}



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