twalthr commented on code in PR #21500:
URL: https://github.com/apache/flink/pull/21500#discussion_r1117229017
##########
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/codegen/CodeGenUtils.scala:
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@@ -1020,16 +1021,19 @@ object CodeGenUtils {
}
// convert internal format to target type
- val externalResultTerm = if (isInternalClass(targetDataType)) {
- s"($targetTypeTerm) ${internalExpr.resultTerm}"
+ val (externalResultTerm, resultType) = if
(isInternalClass(targetDataType)) {
Review Comment:
can we use more meaningful names here? `resultType` does not improve code
readability. `externalResultTypeTerm` is the right name here.
##########
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/codegen/CodeGenUtils.scala:
##########
@@ -922,7 +922,8 @@ object CodeGenUtils {
if (targetDataType.getConversionClass.isPrimitive) {
externalResultTerm
} else {
- s"${internalExpr.nullTerm} ? null : ($externalResultTerm)"
+ // Cast of null is required because of janino issue
https://github.com/janino-compiler/janino/issues/188
+ s"${internalExpr.nullTerm} ?
(${typeTerm(targetDataType.getConversionClass)}) null : ($externalResultTerm)"
Review Comment:
introduce a variable `externalResultTypeTerm =
typeTerm(targetDataType.getConversionClass)`
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