Hey Steve, You should be able to do via the bridgedTo parameter. You can additionally specify a serializer you want to use via rawSerializer parameter:
@FunctionHint(
input = {
@DataTypeHint(value = "RAW", bridgedTo =
Map.class[, rawSerializer = ... ]),
@DataTypeHint("STRING")},
output = @DataTypeHint("STRING")
)
public static String eval(final Object map, final String key)
Best,
Dawid
On 26/10/2020 16:10, Steve Whelan wrote:
> Hi,
>
> I have a column of type *RAW('java.util.Map', ?)* that I want to pass
> to a scalar function UDF. I'm using DataTypeHints but hitting an
> exception. What would be the proper DataTypeHint and data type param
> to achieve this?
>
> @FunctionHint(
> input = {@DataTypeHint("RAW"), @DataTypeHint("STRING")},
> output = @DataTypeHint("STRING")
> )
> public static String eval(final Object map, final String key) {
> // business logic
> }
>
>
> *Exception:*
> *
> *
> Caused by: org.apache.flink.table.api.ValidationException: Invalid
> input arguments. Expected signatures are:
> MAP_VALUE(RAW('java.lang.Object', '...'), STRING)
> at
> org.apache.flink.table.types.inference.TypeInferenceUtil.createInvalidInputException(TypeInferenceUtil.java:190)
> at
> org.apache.flink.table.planner.functions.inference.TypeInferenceOperandChecker.checkOperandTypesOrError(TypeInferenceOperandChecker.java:131)
> at
> org.apache.flink.table.planner.functions.inference.TypeInferenceOperandChecker.checkOperandTypes(TypeInferenceOperandChecker.java:89)
> ... 50 more
> Caused by: org.apache.flink.table.api.ValidationException: Invalid
> argument type at position 0. Data type RAW('java.lang.Object', '...')
> expected but RAW('java.util.Map', ?) passed.
> at
> org.apache.flink.table.types.inference.TypeInferenceUtil.adaptArguments(TypeInferenceUtil.java:137)
> at
> org.apache.flink.table.types.inference.TypeInferenceUtil.adaptArguments(TypeInferenceUtil.java:102)
> at
> org.apache.flink.table.planner.functions.inference.TypeInferenceOperandChecker.checkOperandTypesOrError(TypeInferenceOperandChecker.java:126)
> ... 51 more*
> *
>
>
> Thank you,
>
> Steve
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