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[jira] [Created] (FLINK-10965) suggest that change $resultTypeTerm to Object at org.apache.flink.table.codegen.calls.ScalarFunctionCallGen:104


shaomeng.wang created FLINK-10965:
-------------------------------------

             Summary: suggest that change $resultTypeTerm to Object at org.apache.flink.table.codegen.calls.ScalarFunctionCallGen:104
                 Key: FLINK-10965
                 URL: https://issues.apache.org/jira/browse/FLINK-10965
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
    Affects Versions: 1.5.5
         Environment: 1.5.4
            Reporter: shaomeng.wang


at org.apache.flink.table.codegen.calls.ScalarFunctionCallGen:104

 

 
{code:java}
val functionCallCode =
 s"""
 |${parameters.map(_.code).mkString("\n")}
 |$resultTypeTerm $resultTerm = $functionReference.eval(
 | ${parameters.map(_.resultTerm).mkString(", ")});
 |""".stripMargin{code}
 

 

when wrap a scalar function from another, I use the prototype of "eval" and "getResultType" as

 
{code:java}
public Object eval(Object... objs) throws Exception
public TypeInformation<?> getResultType(Class<?>[] signature) {
{code}
 

but, in codegen, it is change to

 
{code:java}
String reseult = eval(...){code}
 

when getResultType return Types.STRING

and get error message as:

 

 
{panel:title=error msg}


Caused by: org.codehaus.commons.compiler.CompileException: Line 121, Column 13: Assignment conversion not possible from type "java.lang.Object" to type "double"
 at org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:11672)
 at org.codehaus.janino.UnitCompiler.assignmentConversion(UnitCompiler.java:10528)
 at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:3452)
 at org.codehaus.janino.UnitCompiler.access$5200(UnitCompiler.java:212)
 at org.codehaus.janino.UnitCompiler$9.visitAssignment(UnitCompiler.java:3416)
 at org.codehaus.janino.UnitCompiler$9.visitAssignment(UnitCompiler.java:3396)
 at org.codehaus.janino.Java$Assignment.accept(Java.java:4300)
 at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:3396)
 at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2316)
 at org.codehaus.janino.UnitCompiler.access$1700(UnitCompiler.java:212)
 at org.codehaus.janino.UnitCompiler$6.visitExpressionStatement(UnitCompiler.java:1450)
 at org.codehaus.janino.UnitCompiler$6.visitExpressionStatement(UnitCompiler.java:1443)
 at org.codehaus.janino.Java$ExpressionStatement.accept(Java.java:2848)
 at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:1443)
 at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:1523)
 at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1509)
 at org.codehaus.janino.UnitCompiler.access$1600(UnitCompiler.java:212)
{panel}
 

 

the gen code is:

 

 
{code:java}
@Override
 public void flatMap(Object _in1, org.apache.flink.util.Collector c) throws Exception {
 org.apache.flink.types.Row in1 = (org.apache.flink.types.Row) _in1;
 
boolean isNull$1 = (java.lang.String) in1.getField(0) == null;
java.lang.String result$0;
if (isNull$1) {
 result$0 = "";
}
else {
 result$0 = (java.lang.String) (java.lang.String) in1.getField(0);
}
 
 
 

java.lang.String result$2 = function_com$test$Test.eval(
 isNull$1 ? null : (java.lang.String) result$0);

boolean isNull$4 = result$2 == null;
java.lang.String result$3;
if (isNull$4) {
 result$3 = "";
}
else {
 result$3 = (java.lang.String) result$2;
}

if (isNull$4) {
 out.setField(0, null);
}
else {
 out.setField(0, result$3);
}
c.collect(out);
}
{code}
 



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