danny0405 commented on a change in pull request #1715: [CALCITE-3662] Generate
wrong SQL when plan contains Project(Sort(Aggregate)) and aggregate field has
no alias
URL: https://github.com/apache/calcite/pull/1715#discussion_r363631241
##########
File path:
core/src/main/java/org/apache/calcite/rel/rel2sql/RelToSqlConverter.java
##########
@@ -227,8 +227,13 @@ public Result visit(Project e) {
if (isStar(e.getChildExps(), e.getInput().getRowType(), e.getRowType())) {
return x;
}
- final Builder builder =
- x.builder(e, Clause.SELECT);
+ final Builder builder;
+ if (e.getInput() instanceof Sort) {
+ builder = x.builder(e);
+ builder.clauses.add(Clause.SELECT);
+ } else {
Review comment:
With this change, i believe that code snippet in `visit(Sort)` can be
removed:
```java
if (stack.size() != 1 && builder.select.getSelectList() == null) {
// Generates explicit column names instead of start(*) for
// non-root order by to avoid ambiguity.
final List<SqlNode> selectList = Expressions.list();
for (RelDataTypeField field : e.getRowType().getFieldList()) {
addSelect(selectList, builder.context.field(field.getIndex()),
e.getRowType());
}
builder.select.setSelectList(new SqlNodeList(selectList, POS));
}
```
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