How to use

AssignableOperandTypeChecker

in

org.apache.calcite.sql.type

public CalciteException handleUnresolvedFunction(SqlCall call,
  SqlFunction unresolvedFunction, List<RelDataType> argTypes,
  List<String> argNames) {
  // For builtins, we can give a better error message
  final List<SqlOperator> overloads = new ArrayList<>();
  opTab.lookupOperatorOverloads(unresolvedFunction.getNameAsId(), null,
    SqlSyntax.FUNCTION, overloads);
  if (overloads.size() == 1) {
    SqlFunction fun = (SqlFunction) overloads.get(0);
    if ((fun.getSqlIdentifier() == null)
      && (fun.getSyntax() != SqlSyntax.FUNCTION_ID)) {
      final int expectedArgCount =
        fun.getOperandCountRange().getMin();
      throw newValidationError(call,
        RESOURCE.invalidArgCount(call.getOperator().getName(),
          expectedArgCount));
    }
  }
  AssignableOperandTypeChecker typeChecking =
    new AssignableOperandTypeChecker(argTypes, argNames);
  String signature =
    typeChecking.getAllowedSignatures(
      unresolvedFunction,
      unresolvedFunction.getName());
  throw newValidationError(call,
    RESOURCE.validatorUnknownFunction(signature));
}

public CalciteException handleUnresolvedFunction(SqlCall call,
  SqlFunction unresolvedFunction, List<RelDataType> argTypes,
  List<String> argNames) {
 // For builtins, we can give a better error message
 final List<SqlOperator> overloads = new ArrayList<>();
 opTab.lookupOperatorOverloads(unresolvedFunction.getNameAsId(), null,
   SqlSyntax.FUNCTION, overloads);
 if (overloads.size() == 1) {
  SqlFunction fun = (SqlFunction) overloads.get(0);
  if ((fun.getSqlIdentifier() == null)
    && (fun.getSyntax() != SqlSyntax.FUNCTION_ID)) {
   final int expectedArgCount =
     fun.getOperandCountRange().getMin();
   throw newValidationError(call,
     RESOURCE.invalidArgCount(call.getOperator().getName(),
       expectedArgCount));
  }
 }
 AssignableOperandTypeChecker typeChecking =
   new AssignableOperandTypeChecker(argTypes, argNames);
 String signature =
   typeChecking.getAllowedSignatures(
     unresolvedFunction,
     unresolvedFunction.getName());
 throw newValidationError(call,
   RESOURCE.validatorUnknownFunction(signature));
}

public CalciteException handleUnresolvedFunction(SqlCall call,
  SqlFunction unresolvedFunction, List<RelDataType> argTypes,
  List<String> argNames) {
 // For builtins, we can give a better error message
 final List<SqlOperator> overloads = new ArrayList<>();
 opTab.lookupOperatorOverloads(unresolvedFunction.getNameAsId(), null,
   SqlSyntax.FUNCTION, overloads);
 if (overloads.size() == 1) {
  SqlFunction fun = (SqlFunction) overloads.get(0);
  if ((fun.getSqlIdentifier() == null)
    && (fun.getSyntax() != SqlSyntax.FUNCTION_ID)) {
   final int expectedArgCount =
     fun.getOperandCountRange().getMin();
   throw newValidationError(call,
     RESOURCE.invalidArgCount(call.getOperator().getName(),
       expectedArgCount));
  }
 }
 AssignableOperandTypeChecker typeChecking =
   new AssignableOperandTypeChecker(argTypes, argNames);
 String signature =
   typeChecking.getAllowedSignatures(
     unresolvedFunction,
     unresolvedFunction.getName());
 throw newValidationError(call,
   RESOURCE.validatorUnknownFunction(signature));
}