/**
* Burrows into a synthetic record and returns the underlying relation which provides the field
* called <code>fieldName</code>.
*/
public JavaRel implementFieldAccess(JavaRelImplementor implementor, String fieldName) {
if (!isBoxed()) {
return implementor.implementFieldAccess((JavaRel) getChild(), fieldName);
}
RelDataType type = getRowType();
int field = type.getFieldOrdinal(fieldName);
RexLocalRef ref = program.getProjectList().get(field);
final int index = ref.getIndex();
return implementor.findRel((JavaRel) this, program.getExprList().get(index));
}
/**
* Determines whether it is possible to implement a set of expressions in Java.
*
* @param program Program to translate
* @return whether all expressions in the program can be implemented
*/
public boolean canTranslate(RelNode rel, RexProgram program) {
RexToOJTranslator translator = newTranslator(rel);
TranslationTester tester = new TranslationTester(translator, true);
final List<RexNode> exprList = program.getExprList();
for (RexNode expr : exprList) {
if (!tester.canTranslate(expr)) {
return false;
}
}
return true;
}