Mixing
Presto custom UDF with ROW type
I am trying to write a custom UDF which takes variable arguments, so I was thinking to use ROW Type as the argument type like below.
@Description("test")
@ScalarFunction("test")
@SqlType(StandardTypes.ARRAY)
public static ArrayList<Integer> test(@SqlType(StandardTypes.JSON) Slice def, @SqlType(StandardTypes.ROW) RowType participatingRows) {
try {
Definition definition = JSON_CODEC.fromJson(def.getBytes());
// trying to do something similar to this
// ArrayList<String> names = participatingRows.getFieldByName("name")
// ArrayList<Double> scores = participatingRows.getFieldByName("score")
//
for(RowType.RowField rowField : participatingRows.getFields()){
// how to get the value here
// rowField.getType().getObjectValue()
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
But I am not getting how to fetch values out of the RowField object . I am trying to get fields by name, fields are heterogeneous, meaning one can be an array or string or double.
Thanks
java user-defined-functions prestodb
asked Nov 20 '18 at 11:08
Rijo JosephRijo Joseph
6282625
add a comment |
I am trying to write a custom UDF which takes variable arguments, so I was thinking to use ROW Type as the argument type like below.
@Description("test")
@ScalarFunction("test")
@SqlType(StandardTypes.ARRAY)
public static ArrayList<Integer> test(@SqlType(StandardTypes.JSON) Slice def, @SqlType(StandardTypes.ROW) RowType participatingRows) {
try {
Definition definition = JSON_CODEC.fromJson(def.getBytes());
// trying to do something similar to this
// ArrayList<String> names = participatingRows.getFieldByName("name")
// ArrayList<Double> scores = participatingRows.getFieldByName("score")
//
for(RowType.RowField rowField : participatingRows.getFields()){
// how to get the value here
// rowField.getType().getObjectValue()
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
But I am not getting how to fetch values out of the RowField object . I am trying to get fields by name, fields are heterogeneous, meaning one can be an array or string or double.
Thanks
java user-defined-functions prestodb
asked Nov 20 '18 at 11:08
Rijo JosephRijo Joseph
6282625
add a comment |
I am trying to write a custom UDF which takes variable arguments, so I was thinking to use ROW Type as the argument type like below.
@Description("test")
@ScalarFunction("test")
@SqlType(StandardTypes.ARRAY)
public static ArrayList<Integer> test(@SqlType(StandardTypes.JSON) Slice def, @SqlType(StandardTypes.ROW) RowType participatingRows) {
try {
Definition definition = JSON_CODEC.fromJson(def.getBytes());
// trying to do something similar to this
// ArrayList<String> names = participatingRows.getFieldByName("name")
// ArrayList<Double> scores = participatingRows.getFieldByName("score")
//
for(RowType.RowField rowField : participatingRows.getFields()){
// how to get the value here
// rowField.getType().getObjectValue()
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
But I am not getting how to fetch values out of the RowField object . I am trying to get fields by name, fields are heterogeneous, meaning one can be an array or string or double.
Thanks
java user-defined-functions prestodb
asked Nov 20 '18 at 11:08
Rijo JosephRijo Joseph
6282625
I am trying to write a custom UDF which takes variable arguments, so I was thinking to use ROW Type as the argument type like below.
@Description("test")
@ScalarFunction("test")
@SqlType(StandardTypes.ARRAY)
public static ArrayList<Integer> test(@SqlType(StandardTypes.JSON) Slice def, @SqlType(StandardTypes.ROW) RowType participatingRows) {
try {
Definition definition = JSON_CODEC.fromJson(def.getBytes());
// trying to do something similar to this
// ArrayList<String> names = participatingRows.getFieldByName("name")
// ArrayList<Double> scores = participatingRows.getFieldByName("score")
//
for(RowType.RowField rowField : participatingRows.getFields()){
// how to get the value here
// rowField.getType().getObjectValue()
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
But I am not getting how to fetch values out of the RowField object . I am trying to get fields by name, fields are heterogeneous, meaning one can be an array or string or double.
Thanks
java user-defined-functions prestodb
java user-defined-functions prestodb
asked Nov 20 '18 at 11:08
Rijo JosephRijo Joseph
6282625
asked Nov 20 '18 at 11:08
Rijo JosephRijo Joseph
6282625
asked Nov 20 '18 at 11:08
Rijo JosephRijo Joseph
6282625
asked Nov 20 '18 at 11:08
Rijo JosephRijo Joseph
6282625
asked Nov 20 '18 at 11:08
Rijo JosephRijo Joseph
6282625
6282625
add a comment |
add a comment |
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