cjj2010 commented on code in PR #4774:
URL: https://github.com/apache/calcite/pull/4774#discussion_r2762801721
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mongodb/src/main/java/org/apache/calcite/adapter/mongodb/MongoProject.java:
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@@ -76,7 +76,9 @@ public MongoProject(RelOptCluster cluster, RelTraitSet
traitSet,
MongoRules.mongoFieldNames(getInput().getRowType()));
final List<String> items = new ArrayList<>();
for (Pair<RexNode, String> pair : getNamedProjects()) {
- final String name = pair.right;
+ final String name = pair.right.startsWith("$f")
+ ? "_" + pair.right.substring(2)
Review Comment:
> It seems there's no test result for this line of code.
The testAggFunctionalMinFilter case is designed to verify the result of this
line. Originally, the project was "$f0", but now the result is "_0"
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