THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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public @interface ArgumentHint {
String name() default "";
boolean isOptional() default true;
} |
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Function developing and call procedure
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developing
For UDF development or call developers, the UDX or procedure we develop can be roughly divided into two types:
1 . Class overloads multiple methods with different parameters and types. Users need to specify all the parameters when using.
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// UDF Development
public static class NamedArgumentsTableFunction extends TableFunction<Object> {
// Method overloads with different parameter sets
// Example usage: SELECT * FROM TABLE(my_table_function(in1 => 'value1', in2 => 'value2'))
@FunctionHint(
input = {@DataTypeHint("STRING"), @DataTypeHint("STRING")},
output = @DataTypeHint("STRING"),
argumentNames = {"in1", "in2"})
public void eval(String arg1, String arg2) {
collect(arg1 + ", " + arg2);
}
// Example usage: SELECT * FROM TABLE(my_table_function(in1 => 'value1', in2 => 'value2', in3 => 'value3'))
@FunctionHint(
input = {@DataTypeHint("STRING"), @DataTypeHint("STRING"), @DataTypeHint("STRING")},
output = @DataTypeHint("STRING"),
argumentNames = {"in1", "in2", "in3"})
public void eval(String arg1, String arg2, String arg3) {
collect(arg1 + ", " + arg2);
}
}
// Call Procedure Development
public static class NamedArgumentsProcedure implements Procedure {
// Method overloads with different parameter sets
// Example usage: CALL myNamedProcedure(in1 => 'value1', d => 100)
@ProcedureHint(
input = {@DataTypeHint("STRING"), @DataTypeHint("INT")},
output = @DataTypeHint("STRING"),
argumentNames = {"in1", "in2"})
public String[] call(ProcedureContext procedureContext, String arg1, Integer arg2) {
return new String[]{arg1 + ", " + arg2};
}
// Example usage: CALL myNamedProcedure(in1 => 100, in2 => 200)
@ProcedureHint(
input = {@DataTypeHint("INT"), @DataTypeHint("INT")},
output = @DataTypeHint("STRING"),
argumentNames = {"in1", "in2"})
public String[] call(ProcedureContext procedureContext, Integer arg1, Integer arg2) {
return new String[]{arg1 + ", " + arg2};
}
} |
2 .The class can only have one method, and users can optionally specify parameters.
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// UDF Development
public static class NamedArgumentsTableFunction extends TableFunction<Object> {
// Example usage: SELECT * FROM TABLE(my_table_function(in1 => 'value1', in2 => 'value2'))
// Example usage: SELECT * FROM TABLE(my_table_function(in1 => 'value1', in2 => 'value2', in3 => 'value3'))
@FunctionHint(
input = {@DataTypeHint("STRING"), @DataTypeHint(value = "STRING", isOptional = false), @DataTypeHint(value = "STRING", isOptional = true)},
output = @DataTypeHint("STRING"),
argumentNames = {"in1", "in2", "in3"})
public void eval(String arg1, String arg2, String arg3) {
collect(arg1 + ", " + arg2 + "," + arg3);
}
}
// Call Procedure Development
public static class NamedArgumentsProcedure implements Procedure {
// Example usage: CALL myNamedProcedure(in1 => 'value1', in2 => 'value2')
// Example usage: CALL myNamedProcedure(in1 => 'value1', in2 => 'value2', in3 => 'value3')
@ProcedureHint(
input = {@DataTypeHint(value = "STRING", isOptional = false), @DataTypeHint(value = "STRING", isOptional = false), @DataTypeHint(value = "STRING", isOptional = true)},
output = @DataTypeHint("STRING"),
argumentNames = {"c", "d", "e"})
public String[] call(ProcedureContext procedureContext, String arg1, String arg2, String arg3) {
return new String[]{arg1 + ", " + arg2 + "," + arg3};
}
} |
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