List<PredicateLeaf> leafCache, int variable) { String columnName = getColumnName(expression, variable); if (columnName == null) { return new ExpressionTree(TruthValue.YES_NO_NULL);
List<PredicateLeaf> leafCache, int variable) { String columnName = getColumnName(expression, variable); if (columnName == null) { return new ExpressionTree(TruthValue.YES_NO_NULL);