public SqlRexConvertlet get(SqlCall call) {
SqlRexConvertlet convertlet;
final SqlOperator op = call.getOperator();
// Is there a convertlet for this operator
// (e.g. SqlStdOperatorTable.plusOperator)?
convertlet = (SqlRexConvertlet) map.get(op);
if (convertlet != null) {
return convertlet;
}
// Is there a convertlet for this class of operator
// (e.g. SqlBinaryOperator)?
Class<? extends Object> clazz = op.getClass();
while (clazz != null) {
convertlet = (SqlRexConvertlet) map.get(clazz);
if (convertlet != null) {
return convertlet;
}
clazz = clazz.getSuperclass();
}
// Is there a convertlet for this class of expression
// (e.g. SqlCall)?
clazz = call.getClass();
while (clazz != null) {
convertlet = (SqlRexConvertlet) map.get(clazz);
if (convertlet != null) {
return convertlet;
}
clazz = clazz.getSuperclass();
}
return null;
}
public Void visit(SqlCall call) {
final SqlOperator operator = call.getOperator();
if (operator == SqlStdOperatorTable.andOperator) {
throw new Found();
}
return super.visit(call);
}
/** Throws a validation error if a DISTINCT or ALL quantifier is present but not allowed. */
protected void validateQuantifier(SqlValidator validator, SqlCall call) {
if ((null != call.getFunctionQuantifier()) && !isQuantifierAllowed()) {
throw validator.newValidationError(
call.getFunctionQuantifier(),
EigenbaseResource.instance()
.FunctionQuantifierNotAllowed
.ex(call.getOperator().getName()));
}
}
// Override to copy all arguments regardless of whether visitor changes
// them.
protected SqlNode visitScoped(SqlCall call) {
ArgHandler<SqlNode> argHandler = new CallCopyingArgHandler(call, true);
call.getOperator().acceptCall(this, call, false, argHandler);
return argHandler.result();
}
