public Void visit(SqlCall call) {
final SqlOperator operator = call.getOperator();
if (operator.isAggregator()) {
throw new Util.FoundOne(call);
}
// User-defined function may not be resolved yet.
if (operator instanceof SqlFunction
&& ((SqlFunction) operator).getFunctionType()
== SqlFunctionCategory.USER_DEFINED_FUNCTION) {
final List<SqlOperator> list = Lists.newArrayList();
opTab.lookupOperatorOverloads(
((SqlFunction) operator).getSqlIdentifier(),
SqlFunctionCategory.USER_DEFINED_FUNCTION,
SqlSyntax.FUNCTION,
list);
for (SqlOperator sqlOperator : list) {
if (sqlOperator.isAggregator()) {
throw new Util.FoundOne(call);
}
}
}
if (call.isA(SqlKind.QUERY)) {
// don't traverse into queries
return null;
}
if (call.getKind() == SqlKind.OVER) {
if (over) {
throw new Util.FoundOne(call);
} else {
// an aggregate function over a window is not an aggregate!
return null;
}
}
return super.visit(call);
}
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);
}
// 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();
}