Example #1
0
 /**
  * Finds an aggregate.
  *
  * @param node Parse tree to search
  * @return First aggregate function in parse tree, or null if not found
  */
 public SqlNode findAgg(SqlNode node) {
   try {
     node.accept(this);
     return null;
   } catch (Util.FoundOne e) {
     Util.swallow(e, null);
     return (SqlNode) e.getNode();
   }
 }
Example #2
0
 /**
  * Returns whether a given node contains a RexCall with a specified operator
  *
  * @param operator to look for
  * @param node a RexNode tree
  */
 public static RexCall findOperatorCall(final SqlOperator operator, RexNode node) {
   try {
     RexVisitor<Void> visitor =
         new RexVisitorImpl<Void>(true) {
           public Void visitCall(RexCall call) {
             if (call.getOperator().equals(operator)) {
               throw new Util.FoundOne(call);
             }
             return super.visitCall(call);
           }
         };
     node.accept(visitor);
     return null;
   } catch (Util.FoundOne e) {
     Util.swallow(e, null);
     return (RexCall) e.getNode();
   }
 }