void commaList(SqlWriter writer) { // The precedence of the comma operator if low but not zero. For // instance, this ensures parentheses in // select x, (select * from foo order by z), y from t for (SqlNode node : list) { writer.sep(","); node.unparse(writer, 2, 3); } }
void andOrList(SqlWriter writer, SqlKind sepKind) { SqlBinaryOperator sepOp = sepKind == SqlKind.AND ? SqlStdOperatorTable.AND : SqlStdOperatorTable.OR; for (int i = 0; i < list.size(); i++) { SqlNode node = list.get(i); writer.sep(sepKind.name(), false); // The precedence pulling on the LHS of a node is the // right-precedence of the separator operator, except at the start // of the list; similarly for the RHS of a node. If the operator // has left precedence 4 and right precedence 5, the precedences // in a 3-node list will look as follows: // 0 <- node1 -> 4 5 <- node2 -> 4 5 <- node3 -> 0 int lprec = (i == 0) ? 0 : sepOp.getRightPrec(); int rprec = (i == (list.size() - 1)) ? 0 : sepOp.getLeftPrec(); node.unparse(writer, lprec, rprec); } }