dssysolyatin commented on code in PR #4926:
URL: https://github.com/apache/calcite/pull/4926#discussion_r3271610775
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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:
Why do you need to call `registerOperandSubQueries` for parameters.
`registerOperandSubQueries(parentScope, call, 0);`
`registerOperandSubQueries` does:
> Registers any sub-queries inside a given call operand, and converts the
> operand to a scalar sub-query if the operator requires it.
SqlLambda.parameters is list of `SqlIdentitifier`. Can it ever be a
`SubQuery`? I hope not.
So, `registerOperandSubQueries(parentScope, call, 0)` should do nothing
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