walterddr commented on code in PR #8535:
URL: https://github.com/apache/pinot/pull/8535#discussion_r850742106
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pinot-common/src/main/java/org/apache/pinot/common/function/scalar/DataTypeConversionFunctions.java:
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@@ -32,6 +39,33 @@ public class DataTypeConversionFunctions {
private DataTypeConversionFunctions() {
}
+ @ScalarFunction
+ public static Object cast(Object value, String targetTypeLiteral) {
Review Comment:
ScalarFunction / FunctionInvoker doesn't provide a dynamic return type
resolution at runtime --> e.g. determine what's being returned based on the
argument passed in. which is exactly what's needed here.
The SQL here in test are actually compiled into `CastTransformFunction`
which does support result metadata --> that's dynamically determined.
What's missing here is a "CAST" that's not a transform function, which
require changes to function invoker.
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