dssysolyatin commented on code in PR #4926:
URL: https://github.com/apache/calcite/pull/4926#discussion_r3263540457
##########
core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java:
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@@ -3135,7 +3135,11 @@ private void registerQuery(
forceNullable);
operands = call.getOperandList();
for (int i = 0; i < operands.size(); i++) {
- registerOperandSubQueries(parentScope, call, i);
+ // Use lambdaScope for the expression body (operand 1) so that
+ // nested lambdas can resolve outer lambda parameters via the
+ // scope chain, rather than treating them as table column names.
+ registerOperandSubQueries(
+ i == 1 ? lambdaScope : parentScope, call, i);
Review Comment:
Instead of the magic `i == 1` inside the for loop, can we just write: (We
anyway expect shape of `SqlLambda`)
```
registerOperandSubQueries(lambdaScope, call.getExpression(), i)
```
Also, I don't quite get why we need `registerOperandSubQueries` for the
`parameters` (operand = 0)? Do we need this loop at all ?
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