public Queryable<T> where(
Queryable<T> source, FunctionExpression<? extends Predicate1<T>> predicate) {
RelNode child = toRel(source);
RexNode node = translator.toRex(predicate, child);
setRel(new FilterRel(translator.cluster, child, node));
return source;
}
public <TResult> Queryable<TResult> select(
Queryable<T> source, FunctionExpression<Function1<T, TResult>> selector) {
RelNode child = toRel(source);
List<RexNode> nodes = translator.toRexList(selector, child);
setRel(
new ProjectRel(
translator.cluster,
child,
nodes.toArray(new RexNode[nodes.size()]),
null,
ProjectRelBase.Flags.Boxed));
return null;
}
RelNode toRel(Queryable<T> queryable) {
if (queryable instanceof QueryableDefaults.Replayable) {
//noinspection unchecked
((QueryableDefaults.Replayable) queryable).replay(this);
return rel;
}
if (queryable instanceof Table) {
final OptiqPrepareImpl.RelOptTableImpl relOptTable =
new OptiqPrepareImpl.RelOptTableImpl(
null, ((Table) queryable).getRowType(), new String[0], (Table) queryable);
if (queryable instanceof TranslatableTable) {
return ((TranslatableTable) queryable).toRel(translator, relOptTable);
} else {
return new TableAccessRel(translator.cluster, relOptTable);
}
}
return translator.translate(queryable.getExpression());
}
