001package gudusoft.gsqlparser.ir.logical;
002
003import gudusoft.gsqlparser.ir.logical.rex.*;
004
005/**
006 * Visitor interface for RexNode hierarchy.
007 */
008public interface RexNodeVisitor<R> {
009    R visitColumnRef(RexColumnRef node);
010    R visitLiteral(RexLiteral node);
011    R visitCall(RexCall node);
012    R visitParamRef(RexParamRef node);
013    R visitSubquery(RexSubquery node);
014    R visitWildcard(RexWildcard node);
015    R visitCast(RexCast node);
016}