use of org.apache.calcite.schema.ScalarFunction in project apex-malhar by apache.
the class SQLExecEnvironment method registerFunction.
/**
* Register custom function from given static method with this {@link SQLExecEnvironment}
*
* @param name Name of the scalar SQL function that needs make available to SQL Statement
* @param clazz {@link Class} which contains given static method
* @param methodName Name of the method from given clazz
*
* @return Return this {@link SQLExecEnvironment}
*/
public SQLExecEnvironment registerFunction(String name, Class clazz, String methodName) {
Preconditions.checkNotNull(name, "Function name cannot be null");
ScalarFunction scalarFunction = ScalarFunctionImpl.create(clazz, methodName);
return registerFunction(name, scalarFunction);
}
use of org.apache.calcite.schema.ScalarFunction in project calcite by apache.
the class ModelHandler method addFunctions.
/**
* Creates and validates a {@link ScalarFunctionImpl}, and adds it to a
* schema. If {@code methodName} is "*", may add more than one function.
*
* @param schema Schema to add to
* @param functionName Name of function; null to derived from method name
* @param path Path to look for functions
* @param className Class to inspect for methods that may be user-defined
* functions
* @param methodName Method name;
* null means use the class as a UDF;
* "*" means add all methods
* @param upCase Whether to convert method names to upper case, so that they
* can be called without using quotes
*/
public static void addFunctions(SchemaPlus schema, String functionName, List<String> path, String className, String methodName, boolean upCase) {
final Class<?> clazz;
try {
clazz = Class.forName(className);
} catch (ClassNotFoundException e) {
throw new RuntimeException("UDF class '" + className + "' not found");
}
final TableFunction tableFunction = TableFunctionImpl.create(clazz, Util.first(methodName, "eval"));
if (tableFunction != null) {
schema.add(functionName, tableFunction);
return;
}
// Must look for TableMacro before ScalarFunction. Both have an "eval"
// method.
final TableMacro macro = TableMacroImpl.create(clazz);
if (macro != null) {
schema.add(functionName, macro);
return;
}
if (methodName != null && methodName.equals("*")) {
for (Map.Entry<String, ScalarFunction> entry : ScalarFunctionImpl.createAll(clazz).entries()) {
String name = entry.getKey();
if (upCase) {
name = name.toUpperCase(Locale.ROOT);
}
schema.add(name, entry.getValue());
}
return;
} else {
final ScalarFunction function = ScalarFunctionImpl.create(clazz, Util.first(methodName, "eval"));
if (function != null) {
final String name;
if (functionName != null) {
name = functionName;
} else if (upCase) {
name = methodName.toUpperCase(Locale.ROOT);
} else {
name = methodName;
}
schema.add(name, function);
return;
}
}
if (methodName == null) {
final AggregateFunction aggFunction = AggregateFunctionImpl.create(clazz);
if (aggFunction != null) {
schema.add(functionName, aggFunction);
return;
}
}
throw new RuntimeException("Not a valid function class: " + clazz + ". Scalar functions and table macros have an 'eval' method; " + "aggregate functions have 'init' and 'add' methods, and optionally " + "'initAdd', 'merge' and 'result' methods.");
}
use of org.apache.calcite.schema.ScalarFunction in project beam by apache.
the class SqlOperators method createUdfOperator.
private static SqlUserDefinedFunction createUdfOperator(String name, Method method, final SqlSyntax syntax, String funGroup, String jarPath) {
Function function = ZetaSqlScalarFunctionImpl.create(method, funGroup, jarPath);
final RelDataTypeFactory typeFactory = createTypeFactory();
List<RelDataType> argTypes = new ArrayList<>();
List<SqlTypeFamily> typeFamilies = new ArrayList<>();
for (FunctionParameter o : function.getParameters()) {
final RelDataType type = o.getType(typeFactory);
argTypes.add(type);
typeFamilies.add(Util.first(type.getSqlTypeName().getFamily(), SqlTypeFamily.ANY));
}
final FamilyOperandTypeChecker typeChecker = OperandTypes.family(typeFamilies, i -> function.getParameters().get(i).isOptional());
final List<RelDataType> paramTypes = toSql(typeFactory, argTypes);
return new SqlUserDefinedFunction(new SqlIdentifier(name, SqlParserPos.ZERO), infer((ScalarFunction) function), InferTypes.explicit(argTypes), typeChecker, paramTypes, function) {
@Override
public SqlSyntax getSyntax() {
return syntax;
}
};
}
use of org.apache.calcite.schema.ScalarFunction in project calcite by apache.
the class ScalarFunctionImpl method createAll.
/**
* Creates {@link org.apache.calcite.schema.ScalarFunction} for each method in
* a given class.
*/
public static ImmutableMultimap<String, ScalarFunction> createAll(Class<?> clazz) {
final ImmutableMultimap.Builder<String, ScalarFunction> builder = ImmutableMultimap.builder();
for (Method method : clazz.getMethods()) {
if (method.getDeclaringClass() == Object.class) {
continue;
}
if (!Modifier.isStatic(method.getModifiers()) && !classHasPublicZeroArgsConstructor(clazz)) {
continue;
}
final ScalarFunction function = create(method);
builder.put(method.getName(), function);
}
return builder.build();
}
use of org.apache.calcite.schema.ScalarFunction in project calcite by apache.
the class CalciteCatalogReader method toOp.
/**
* Converts a function to a {@link org.apache.calcite.sql.SqlOperator}.
*
* <p>The {@code typeFactory} argument is technical debt; see [CALCITE-2082]
* Remove RelDataTypeFactory argument from SqlUserDefinedAggFunction
* constructor.
*/
private static SqlOperator toOp(RelDataTypeFactory typeFactory, SqlIdentifier name, final Function function) {
List<RelDataType> argTypes = new ArrayList<>();
List<SqlTypeFamily> typeFamilies = new ArrayList<>();
for (FunctionParameter o : function.getParameters()) {
final RelDataType type = o.getType(typeFactory);
argTypes.add(type);
typeFamilies.add(Util.first(type.getSqlTypeName().getFamily(), SqlTypeFamily.ANY));
}
final Predicate<Integer> optional = new PredicateImpl<Integer>() {
public boolean test(Integer input) {
return function.getParameters().get(input).isOptional();
}
};
final FamilyOperandTypeChecker typeChecker = OperandTypes.family(typeFamilies, optional);
final List<RelDataType> paramTypes = toSql(typeFactory, argTypes);
if (function instanceof ScalarFunction) {
return new SqlUserDefinedFunction(name, infer((ScalarFunction) function), InferTypes.explicit(argTypes), typeChecker, paramTypes, function);
} else if (function instanceof AggregateFunction) {
return new SqlUserDefinedAggFunction(name, infer((AggregateFunction) function), InferTypes.explicit(argTypes), typeChecker, (AggregateFunction) function, false, false, typeFactory);
} else if (function instanceof TableMacro) {
return new SqlUserDefinedTableMacro(name, ReturnTypes.CURSOR, InferTypes.explicit(argTypes), typeChecker, paramTypes, (TableMacro) function);
} else if (function instanceof TableFunction) {
return new SqlUserDefinedTableFunction(name, ReturnTypes.CURSOR, InferTypes.explicit(argTypes), typeChecker, paramTypes, (TableFunction) function);
} else {
throw new AssertionError("unknown function type " + function);
}
}
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