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https://issues.apache.org/jira/browse/CALCITE-7187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18021037#comment-18021037
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Yu Xu commented on CALCITE-7187:
--------------------------------
This case returns the byte[] type, but after thinking about it carefully, I
agree with your point of view. There is no need to support the
Byte[]/Character[] type at present. If no one else objects, I will close the
previous jira(https://issues.apache.org/jira/browse/CALCITE-7186) and note 'Not
a Problem'.
> Java UDF byte/Byte array can not mapping to VARBINARY
> -----------------------------------------------------
>
> Key: CALCITE-7187
> URL: https://issues.apache.org/jira/browse/CALCITE-7187
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.40.0
> Reporter: Yu Xu
> Priority: Minor
>
> When we customize a Java UDF with a return type of Byte/byte[], for example:
>
> {code:java}
> public static class CharacterArrayFunction {
> public static byte[] eval(String s) {
> if (s == null) {
> return null;
> }
> try {
> return s.getBytes(StandardCharsets.UTF_8);
> } catch (Exception e) {
> return null;
> }
> }
> } {code}
> After codegen, the execution may encounter the following compatibility
> issues. Currently, Calcite is not compatible with byte/Byte[] to ByteString:
>
> {code:java}
> Caused by: org.codehaus.commons.compiler.CompileException: Line 22, Column
> 65: Cannot cast "byte[]" to "org.apache.calcite.avatica.util.ByteString" at
> org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:13228)
> at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:5311) at
> org.codehaus.janino.UnitCompiler.access$8800(UnitCompiler.java:240) at
> org.codehaus.janino.UnitCompiler$16.visitCast(UnitCompiler.java:4819)
> at org.codehaus.janino.UnitCompiler$16.visitCast(UnitCompiler.java:4800)
> at org.codehaus.janino.Java$Cast.accept(Java.java:5283) at
> org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:4800) at
> org.codehaus.janino.UnitCompiler.compileGetValue(UnitCompiler.java:5945)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2897) at
> org.codehaus.janino.UnitCompiler.access$2800(UnitCompiler.java:240) at
> org.codehaus.janino.UnitCompiler$6.visitReturnStatement(UnitCompiler.java:1594)
> at
> org.codehaus.janino.UnitCompiler$6.visitReturnStatement(UnitCompiler.java:1579)
> at org.codehaus.janino.Java$ReturnStatement.accept(Java.java:3888)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:1579) at
> org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:1665)
> {code}
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